{"id":5208,"date":"2026-09-18T09:14:41","date_gmt":"2026-09-18T09:14:41","guid":{"rendered":"https:\/\/www.henghuahose.com\/?post_type=product&#038;p=5208"},"modified":"2026-09-18T09:14:42","modified_gmt":"2026-09-18T09:14:42","slug":"npt-male-hollow-hex-plug-4nn","status":"publish","type":"product","link":"https:\/\/www.henghuahose.com\/pt\/product\/npt-male-hollow-hex-plug-4nn\/","title":{"rendered":"4NN NPT Male Hollow Hex Plug &#8211; Low Profile Internal Hex NPT Blanking 4NN Adapter"},"content":{"rendered":"<p>A 4NN adapter is an NPT male hollow hex plug: an American tapered pipe plug that closes a pipe port with an internal hex socket drive instead of an external hex head. It is a blanking device with a closed body and no through passage, so nothing flows through it, and it seals on the same tapered thread flanks as any other NPT plug. Because the drive is inside the part, the installed height is low and no wrench clearance is needed around the port, which is why this form is chosen for recessed and congested ports.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Principais vantagens<\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Internal hex socket drive, so the plug is turned with a hex key and needs no wrench clearance around the port.<\/li>\r\n\r\n\r\n\r\n<li>Low installed profile: the body sits close to the port face, unlike a hex head plug of the same thread.<\/li>\r\n\r\n\r\n\r\n<li>Six published sizes from Z1\/8&#8243;X27 to Z1&#8243;X11.5, covering the smaller ANSI\/ASME B1.20.1 pipe sizes.<\/li>\r\n\r\n\r\n\r\n<li>Closed body with no bore, so it is a full blanking device, not a restrictor or a vent.<\/li>\r\n\r\n\r\n\r\n<li>NPT taper thread that seals on the engaged thread flanks, with a sealant or in the dryseal NPTF form.<\/li>\r\n\r\n\r\n\r\n<li>Carbon steel with trivalent chromium zinc plating, or 304 \/ 316 stainless steel for corrosive service.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">1. What a 4NN Adapter Does<\/h2>\r\n\r\n\r\n\r\n<p>The 4NN adapter is a hydraulic plug adapter that closes a pipe port from the inside of its own drive. It is an NPT male hollow hex plug: one end carries an American tapered pipe thread marked E on the series drawing, the body is solid and closed, and the drive is an internal hex socket marked S1 and cut into the outer face. A hex key is inserted into that socket to turn the plug in and out, so there is no external hex head to swing a wrench around.<\/p>\r\n\r\n\r\n\r\n<p>Both sides of the joint still have to match exactly: the pipe size and thread pitch of the plug have to agree with an NPT port. The socket drive changes only how the plug is turned; it does not change the thread, the seal or the pressure logic of the joint.<\/p>\r\n\r\n\r\n\r\n<p>The sealing principle of this series is the same as any NPT plug: the tapered thread wedges into the tapered port thread, and the joint becomes pressure-tight along the engaged thread flanks. The joint is normally completed with a thread sealant, or with an NPTF dryseal thread form made to SAE J476 where a sealant-free joint is required. The socket in the outer face is a recess for the tool and does not pass through the body, so the part remains a closed blanking device. The 4NN adapter does not seal on a 74 degree cone, on a 37 degree flare, on a flat face or on an O-ring, and there is no elastomer in the joint unless the installer adds a sealant.<\/p>\r\n\r\n\r\n\r\n<p>Where a port has to be closed, the hollow hex form is preferred over a solid plug in three situations. First, where the port is recessed in a housing or sits in a pocket, so a wrench cannot reach an external hex. Second, where adjacent fittings, tubes or pipework leave no room to swing a wrench, but a hex key can be inserted straight into the socket. Third, where the installed height has to stay low, because a hollow hex plug sits much closer to the port face than a hex head plug of the same thread.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">2. 4NN Specifications<\/h2>\r\n\r\n\r\n\r\n<p>The two ends are described below as a mirrored pair: the connection to the port, and the closed end that carries the drive socket.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">2.1 Connection 1 &#8211; NPT male taper thread, external thread E<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Thread standard and family: ANSI\/ASME B1.20.1, general purpose pipe threads, NPT taper thread. The dryseal form of the same joint is covered by SAE J476, where the joint is made pressure-tight on the threads without a sealant.<\/li>\r\n\r\n\r\n\r\n<li>Thread sizes available at E: Z1\/8&#8243;X27, Z1\/4&#8243;X18, Z3\/8&#8243;X18, Z1\/2&#8243;X14, Z3\/4&#8243;X14 and Z1&#8243;X11.5. The letter Z in the catalogue notation marks the tapered pipe thread, and the number after X is the pitch in threads per inch.<\/li>\r\n\r\n\r\n\r\n<li>Gender: male pipe thread (external), tapered along its length.<\/li>\r\n\r\n\r\n\r\n<li>Sealing method: wedging contact between the tapered thread flanks of the plug and the port, completed with a thread sealant, or with a dryseal NPTF thread form where a sealant-free joint is specified. No O-ring, no cone seat and no flat face is used at this joint.<\/li>\r\n\r\n\r\n\r\n<li>Mating port standard: an NPT female pipe port of the same nominal pipe size, cut to ANSI\/ASME B1.20.1. The port may be in a manifold, a valve body, a cylinder, a pump housing or a pipe fitting.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">2.2 Connection 2 &#8211; Closed end with internal hex socket S1<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Connection type: closed. The outer end carries a recessed internal hex socket for the tool, and the body behind that socket is solid, so there is no second thread, no second seat and no bore through the part.<\/li>\r\n\r\n\r\n\r\n<li>Sizes available: all six published rows are closed; every 4NN part number is a blanking plug and none of them passes flow.<\/li>\r\n\r\n\r\n\r\n<li>Gender: not applicable, because no mating part is fitted at this end.<\/li>\r\n\r\n\r\n\r\n<li>Sealing method: not applicable at this end. The socket is a tool drive only, and sealing takes place entirely on the pipe thread described in 2.1.<\/li>\r\n\r\n\r\n\r\n<li>Mating part standard: not applicable. What is required at this side of the plug is clearance for the hex key and enough depth in front of the port face for the key to enter the socket.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">2.3 Construction and Materials<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Body material: this steel hydraulic adapter is offered in carbon steel, 304 stainless steel, 316 stainless steel or brass, selected per order. Brass is a common selection for NPT plugs in water, air and general service lines.<\/li>\r\n\r\n\r\n\r\n<li>Plating: trivalent chromium zinc plating (Cr3+) or zinc-nickel plating on carbon steel bodies. Stainless steel bodies are supplied without plating.<\/li>\r\n\r\n\r\n\r\n<li>Thread form: the external NPT taper thread is cut or rolled to ANSI\/ASME B1.20.1 and inspected with ring gauges so that the thread depth and the taper match the port.<\/li>\r\n\r\n\r\n\r\n<li>Drive socket: the internal hex socket is cut in the same set-up as the thread where the process allows, so the socket runs true to the thread and the plug drives without wobble.<\/li>\r\n\r\n\r\n\r\n<li>Seal material: as a steel hydraulic adapter this plug carries no elastomeric seal of its own. Sealing is completed by the tapered thread together with the thread sealant chosen at installation, so any elastomer in this joint comes from that sealant, not from the plug. Where an O-ring is used elsewhere in the same circuit, the published material ranges are approximately -30\u00b0C to +100\u00b0C for NBR, -20\u00b0C to +200\u00b0C for FKM and -40\u00b0C to +120\u00b0C for EPDM.<\/li>\r\n\r\n\r\n\r\n<li>Machining process: the plug is turned from bar stock on CNC lathes, the taper thread is produced, the internal hex socket is cut, and the part is deburred. Threads are gauged with ring gauges, and the socket size, the overall length and the socket depth are checked against the drawing batch by batch before packing.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">2.4 Pressure and Temperature<\/h3>\r\n\r\n\r\n\r\n<p>Temperature is governed by the body material and by the thread sealant used, because this hydraulic adapter carries no elastomeric seal of its own. A carbon steel body with zinc plating suits general hydraulic, pneumatic and water service, and 304 or 316 stainless steel is selected for corrosive environments. Where a seal material question arises elsewhere in the same circuit, the published material ranges are approximately -30\u00b0C to +100\u00b0C for NBR, -20\u00b0C to +200\u00b0C for FKM and -40\u00b0C to +120\u00b0C for EPDM elastomers.<\/p>\r\n\r\n\r\n\r\n<p>Working pressure for a given 4NN adapter size is confirmed per order by HENGHUA engineering, based on the thread size, the body wall thickness, the sealing method and the material selected. No single pressure figure is published here for a specific size, because a Z1\/8&#8243; plug and a Z1&#8243; plug do not share one rating.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">2.5 Part Number and Dimension Table<\/h3>\r\n\r\n\r\n\r\n<p>The table below is the complete published dimension table for the 4NN NPT adapter series. Every row is reproduced in printed column order.<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"750\" height=\"265\" class=\"wp-image-5207\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn-dimensions.png\" alt=\"4NN plug size and dimension chart listing part numbers 4NN-02 to 4NN-16 with NPT threads, overall lengths and hex key sizes\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn-dimensions.png 750w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn-dimensions-300x106.png 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn-dimensions-18x6.png 18w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn-dimensions-600x212.png 600w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/figure>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>N.\u00ba DA PE\u00c7A.<\/th>\r\n<th>E<\/th>\r\n<th>L<\/th>\r\n<th>S1<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>4NN-02<\/td>\r\n<td>Z1\/8&#8243;X27<\/td>\r\n<td>8<\/td>\r\n<td>5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4NN-04<\/td>\r\n<td>Z1\/4&#8243;X18<\/td>\r\n<td>10<\/td>\r\n<td>6<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4NN-06<\/td>\r\n<td>Z3\/8&#8243;X18<\/td>\r\n<td>12<\/td>\r\n<td>8<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4NN-08<\/td>\r\n<td>Z1\/2&#8243;X14<\/td>\r\n<td>15<\/td>\r\n<td>10<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4NN-12<\/td>\r\n<td>Z3\/4&#8243;X14<\/td>\r\n<td>16<\/td>\r\n<td>12<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4NN-16<\/td>\r\n<td>Z1&#8243;X11.5<\/td>\r\n<td>18<\/td>\r\n<td>17<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p>What each column means:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>PART NO. is the ordering code. The dash number follows the pipe size step of the series.<\/li>\r\n\r\n\r\n\r\n<li>E is the external NPT taper thread of the plug, written in catalogue notation. The Z marks the tapered pipe thread, the fraction is the nominal pipe size, and the number after X is the pitch in threads per inch, so Z1\/2&#8243;X14 is a 1\/2&#8243; NPT thread at 14 threads per inch.<\/li>\r\n\r\n\r\n\r\n<li>L is the overall length of the plug in millimetres, from the end of the thread to the outer face of the socket end. It is the installed height of the part before thread engagement, and it is short because there is no external hex head.<\/li>\r\n\r\n\r\n\r\n<li>S1 is the width across flats of the internal hex socket, in millimetres. It is the hex key size, not a thread size, and it grows with the pipe size step.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>Thread size and dash chart:<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Dash code<\/th>\r\n<th>Nominal pipe size<\/th>\r\n<th>NPT thread E<\/th>\r\n<th>Part number<\/th>\r\n<th>Overall length L (mm)<\/th>\r\n<th>Hex key S1 (mm)<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>-02<\/td>\r\n<td>1\/8&#8243;<\/td>\r\n<td>Z1\/8&#8243;X27<\/td>\r\n<td>4NN-02<\/td>\r\n<td>8<\/td>\r\n<td>5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>-04<\/td>\r\n<td>1\/4&#8243;<\/td>\r\n<td>Z1\/4&#8243;X18<\/td>\r\n<td>4NN-04<\/td>\r\n<td>10<\/td>\r\n<td>6<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>-06<\/td>\r\n<td>3\/8&#8243;<\/td>\r\n<td>Z3\/8&#8243;X18<\/td>\r\n<td>4NN-06<\/td>\r\n<td>12<\/td>\r\n<td>8<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>-08<\/td>\r\n<td>1\/2&#8243;<\/td>\r\n<td>Z1\/2&#8243;X14<\/td>\r\n<td>4NN-08<\/td>\r\n<td>15<\/td>\r\n<td>10<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>-12<\/td>\r\n<td>3\/4&#8243;<\/td>\r\n<td>Z3\/4&#8243;X14<\/td>\r\n<td>4NN-12<\/td>\r\n<td>16<\/td>\r\n<td>12<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>-16<\/td>\r\n<td>1&#8243;<\/td>\r\n<td>Z1&#8243;X11.5<\/td>\r\n<td>4NN-16<\/td>\r\n<td>18<\/td>\r\n<td>17<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p>Comparison with the hex head NPT plug of the same pipe size, which shows why the hollow hex form is selected where space is tight:<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Pipe size<\/th>\r\n<th>Hex head plug part number<\/th>\r\n<th>Overall length L (mm)<\/th>\r\n<th>Drive<\/th>\r\n<th>Hollow hex plug part number<\/th>\r\n<th>Overall length L (mm)<\/th>\r\n<th>Drive<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>1\/2&#8243;<\/td>\r\n<td>4N-08<\/td>\r\n<td>27<\/td>\r\n<td>22 mm external hex<\/td>\r\n<td>4NN-08<\/td>\r\n<td>15<\/td>\r\n<td>10 mm internal hex<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3\/4&#8243;<\/td>\r\n<td>4N-12<\/td>\r\n<td>29.5<\/td>\r\n<td>27 mm external hex<\/td>\r\n<td>4NN-12<\/td>\r\n<td>16<\/td>\r\n<td>12 mm internal hex<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>1&#8243;<\/td>\r\n<td>4N-16<\/td>\r\n<td>36.5<\/td>\r\n<td>36 mm external hex<\/td>\r\n<td>4NN-16<\/td>\r\n<td>18<\/td>\r\n<td>17 mm internal hex<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">3. How to Read a 4NN Part Number<\/h2>\r\n\r\n\r\n\r\n<p>The 4NN part number has two parts: the series prefix and the dash size.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>4NN is the series prefix. It identifies the part of this page: an NPT male hollow hex plug with a closed body and an internal hex socket drive, as listed in this table.<\/li>\r\n\r\n\r\n\r\n<li>The dash number is the size code, and it follows the pipe size step rather than a tube dash. 02 is the 1\/8&#8243; pipe size, 04 is 1\/4&#8243;, 06 is 3\/8&#8243;, 08 is 1\/2&#8243;, 12 is 3\/4&#8243; and 16 is 1&#8243;.<\/li>\r\n\r\n\r\n\r\n<li>The dash size fixes the thread and the pitch. 4NN-08 carries a Z1\/2&#8243;X14 thread, which is a 1\/2&#8243; NPT thread at 14 threads per inch, and it is driven with the 10 mm hex key printed in the S1 column.<\/li>\r\n\r\n\r\n\r\n<li>No suffix is applied to any row in the 4NN table. Other series in the same catalogue use suffixes such as -SP, -WD or -PK to mark a variant of that series; if a suffix appears on your drawing, quote the full part number including it.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>Worked example using a real row of the table. Part number 4NN-12 decodes as follows:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Series: 4NN, NPT male hollow hex plug.<\/li>\r\n\r\n\r\n\r\n<li>Thread E: Z3\/4&#8243;X14, an American tapered pipe thread of 3\/4&#8243; nominal size at 14 threads per inch.<\/li>\r\n\r\n\r\n\r\n<li>Overall length L: 16 mm, which is the installed height of the plug from the end of the thread to the outer face.<\/li>\r\n\r\n\r\n\r\n<li>Drive socket S1: 12 mm internal hex, so a 12 mm hex key is used.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">4. Installation and Fitment<\/h2>\r\n\r\n\r\n\r\n<p>The NPT joint of a 4NN adapter is made by wedging two tapered threads together. Turn the plug in by hand until it is snug, then tighten with a hex key only as far as the port specification requires. The limit is set by the port rather than by the plug: an NPT thread acts as a wedge, and a plug forced past its seating point loads the housing around the port. Stop tightening when the thread is fully engaged.<\/p>\r\n\r\n\r\n\r\n<p>Thread preparation decides the quality of the joint. Clean the port thread of old tape, old sealant, swarf and oil, and blow it out if the circuit allows. Apply the sealant to the plug thread in the direction of the taper, leaving the first thread or two clean so that no sealant is pushed into the line.<\/p>\r\n\r\n\r\n\r\n<p>Reuse is a practical question rather than a rule of thumb. A 4NN adapter can be refitted if the thread is clean, undamaged and free of corrosion, and if the socket is sound so that the key does not spin. A plug whose thread has been cross-started or flattened, or whose socket has been rounded by a worn key, is not restored by more tape; replace it. Assembly steps:<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li>Confirm that the port is an NPT female port of the same nominal pipe size as the plug, and that it is not a BSPT, BSPP or metric port.<\/li>\r\n\r\n\r\n\r\n<li>Inspect the plug thread, the port thread and the socket for burrs, flats, corrosion and trapped debris.<\/li>\r\n\r\n\r\n\r\n<li>Clean both threads, remove all old tape and sealant, and make sure the socket is empty and the key fits without play.<\/li>\r\n\r\n\r\n\r\n<li>Apply the thread sealant to the plug thread, leaving the leading threads clean, and start the plug by hand.<\/li>\r\n\r\n\r\n\r\n<li>Turn the plug in snug with the correct hex key, then tighten only as far as the port specification requires.<\/li>\r\n\r\n\r\n\r\n<li>Leak-check the blanked port at the pressure agreed for the system, and confirm that the key can still be inserted for future removal.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<p>Common fitment errors and their symptoms:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Fitting an NPT plug into a BSPT or BSPP port. The symptom is a thread that starts by hand and then binds, or a joint that weeps no matter how much sealant is used.<\/li>\r\n\r\n\r\n\r\n<li>Using a hex key that is worn or undersized. The symptom is a rounded socket and a plug that can no longer be removed, which turns a simple maintenance job into a drilling job.<\/li>\r\n\r\n\r\n\r\n<li>Installing this plug where the port face is deep and the key cannot reach the socket. The symptom is a plug that never reaches full engagement, because the drive was not checked against the depth in front of the port.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">5. Applications and Industries<\/h2>\r\n\r\n\r\n\r\n<p>Application tags for this hydraulic plug adapter: hydraulic systems, water jetting, oil and gas, industrial equipment, construction machinery, agriculture, marine and material handling.<\/p>\r\n\r\n\r\n\r\n<p>Concrete scenarios where a 4NN adapter earns its place:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Blanking ports on a manifold face where ports sit close together. A hydraulic manifold or a valve block often carries several plugged ports on one machined face. The internal hex drive means no wrench has to swing around a neighbouring fitting, so the ports can be laid out at a tight pitch and the plugs still sit low.<\/li>\r\n\r\n\r\n\r\n<li>Recessed and pocketed ports. A port set inside a housing recess, behind a flange or below a pipe run can be closed with this plug where a hex head plug cannot be reached by a wrench, because the key enters on the thread axis.<\/li>\r\n\r\n\r\n\r\n<li>Low profile blanking for transport and storage. Where a component leaves a workshop with pipe ports closed, a hollow hex plug keeps the installed envelope small, so the part fits inside frames, covers and packaging without extra clearance.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>&#8211; The same part suits fluid power circuits, marine deck equipment, construction machinery and material handling systems, provided the mating port is an NPT port of the same nominal pipe size and the fluid suits the body material chosen. The published size range ends at Z1&#8243;; for larger NPT ports, use the hex head NPT plug series, which covers sizes up to Z2&#8243;. It is supplied as a steel hydraulic adapter in carbon steel or in stainless steel.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">6. Replacement and Cross-Reference Guide<\/h2>\r\n\r\n\r\n\r\n<p>Replacement selection for this hydraulic plug adapter is organised by thread standard and sealing method, never by brand or catalogue number. An NPT hollow hex plug is identified by three measurements, and nothing else is needed to find a matching part in the 4NN table.<\/p>\r\n\r\n\r\n\r\n<p>Measure these three things:<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li>Measure the port thread: nominal pipe size and pitch in threads per inch. The sizes in this table run Z1\/8&#8243;X27 to Z1&#8243;X11.5, and a matching plug must agree on both the size and the pitch.<\/li>\r\n\r\n\r\n\r\n<li>Check the thread family and the taper. An NPT port takes an NPT plug made to ANSI\/ASME B1.20.1. A BSPT port takes a BSPT plug made to ISO 7-1, and a BSPP port takes a parallel BSPP plug made to ISO 228-1. These are not interchangeable even at the same nominal size.<\/li>\r\n\r\n\r\n\r\n<li>Confirm the drive and the installed envelope. Measure the hex across flats that you need for the key, and confirm that the overall length fits the space in front of the port, because the 4N series is the external hex head plug of the same threads with longer bodies.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<p>Once the three answers are known, choose the row whose E column matches the measured thread. Check that the hex key size in the S1 column is available in your tool kit, and check that the key can be inserted in front of the port face before ordering.<\/p>\r\n\r\n\r\n\r\n<p>Series that are commonly confused with 4NN and are not interchangeable: the SAE J514 JIC 74 degree cone seat family, which seals metal-to-metal on a wide cone face; the SAE J514 JIC 37 degree flare family, which seals metal-to-metal on a conical flare face; the SAE J1926-3 \/ ISO 11926-3 O-ring boss family, which seals with an O-ring on a straight-thread stud end plus a lock nut; the SAE J1453 ORFS family, which seals on a flat face against an elastomeric O-ring; the ISO 6162 flange plug families, which seal with an O-ring in a flange groove; and the BSPT and BSPP families, which use British thread forms at a different pitch.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">7. Ordering, Packaging and Delivery<\/h2>\r\n\r\n\r\n\r\n<p>To order this NPT adapter from the 4NN series, give the series code plus the full part number, for example 4NN-08, and confirm the following with the enquiry:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Full part number, including any suffix shown on your drawing or packing list.<\/li>\r\n\r\n\r\n\r\n<li>Confirmation that the port is an NPT port of the matching nominal pipe size and pitch.<\/li>\r\n\r\n\r\n\r\n<li>Body material: carbon steel, 304 stainless steel, 316 stainless steel or brass.<\/li>\r\n\r\n\r\n\r\n<li>Plating for carbon steel bodies: trivalent chromium zinc plating (Cr3+) or zinc-nickel plating.<\/li>\r\n\r\n\r\n\r\n<li>Whether the clearance in front of the port accepts a hex key of the size in the S1 column.<\/li>\r\n\r\n\r\n\r\n<li>Quantity and the required delivery date.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>Parts are packed in labelled bags or boxes carrying the full part number, with cartons marked for size and quantity, and the taper thread protected so that it arrives free of burrs, for distributor shelves or for direct-to-line OEM delivery. Sample orders and mixed-size trial orders are accepted before a production release, and custom sizes and drawing-based manufacture can be quoted for OEM programmes. Lead time is confirmed per order.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">8. FAQ<\/h2>\r\n\r\n\r\n\r\n<p><strong>What is the difference between JIC 37\u00b0 flare and ORFS, and which should I use?<\/strong> A JIC 37\u00b0 flare fitting seals metal-to-metal on a conical flare face and is specified by SAE J514 in the SAE 37\u00b0 flared family. An ORFS fitting, specified by SAE J1453, seals on a flat face against an elastomeric O-ring held in a groove. Use the family that matches the port on your equipment. Neither one is a substitute for this plug, which closes a tapered NPT pipe port by wedging on the thread.<\/p>\r\n\r\n\r\n\r\n<p><strong>Can NPT and BSPT be interchanged?<\/strong> No. NPT is an American tapered pipe thread made to ANSI\/ASME B1.20.1, and BSPT is a British tapered pipe thread made to ISO 7-1. They differ in thread form and pitch, so the same nominal size will often start by hand and then bind, and the joint will weep. Where a BSPT or BSPP port has to be blanked, use a plug from that family rather than forcing an NPT plug into it.<\/p>\r\n\r\n\r\n\r\n<p><strong>How do I identify the correct 4NN adapter size?<\/strong> Measure the port thread size and pitch and match it to the E column of the table. A Z1\/2&#8243;X14 port calls for 4NN-08, and a Z3\/4&#8243;X14 port calls for 4NN-12. Pipe sizes are nominal, so check the pitch as well as the size, then confirm that the hex key size in the S1 column fits the clearance in front of the port. This NPT adapter is closed, so it blanks the port completely.<\/p>\r\n\r\n\r\n\r\n<p><strong>What seal material should I select for my fluid and temperature?<\/strong> This plug has no elastomeric seal of its own, because the NPT joint seals on the engaged thread flanks together with the sealant used at installation, so the material decision here is the body and the plating. Carbon steel with trivalent chromium zinc plating suits general service, brass is common for water and air, and 304 or 316 stainless steel is selected for corrosive environments. Where an elastomer is used elsewhere in the same circuit, the published ranges are approximately -30\u00b0C to +100\u00b0C for NBR, -20\u00b0C to +200\u00b0C for FKM and -40\u00b0C to +120\u00b0C for EPDM.<\/p>\r\n\r\n\r\n\r\n<p><strong>How is the working pressure of this adapter determined?<\/strong> Working pressure is confirmed per order by HENGHUA engineering, based on the thread size, the body wall thickness, the sealing method and the material selected. Because a Z1\/8&#8243; plug and a Z1&#8243; plug do not share one rating, no single figure is published for the whole series.<\/p>\r\n\r\n\r\n\r\n<p><strong>What is the minimum order quantity and can I get samples?<\/strong> Sample orders and mixed-size trial orders are accepted for validation before a production release. Minimum order quantity depends on the size, the material and the plating selected, and it is confirmed with the quotation. Send the full part number and the quantity you need, and the order desk will quote the smallest practical release quantity for that configuration.<\/p>\r\n\r\n\r\n\r\n<p><strong>When should I choose a hollow hex plug instead of a solid hex head plug?<\/strong> Choose the hollow hex plug where the port is recessed or pocketed, where neighbouring fittings or pipework leave no room to swing a wrench, or where the installed height has to stay low; a 1\/2&#8243; hollow hex plug is 15 mm long against 27 mm for the hex head plug of the same thread. Choose the hex head plug where an external wrench purchase is preferred, where the size required is larger than Z1&#8243;, or where the plug has to be removed and refitted regularly with a wrench.<\/p>\r\n\r\n\r\n\r\n<p>Send the full 4NN adapter part number, the port size and the quantity you need, and HENGHUA will confirm the drawing, the material and the lead time with the quotation.<\/p>\r\n\r\n\r\n\r\n<p>Related series in the same family: <a href=\"https:\/\/www.henghuahose.com\/pt\/product\/npt-male-plug-4n\/\" target=\"_blank\" rel=\"noopener\">the 4N adapter (plug)<\/a> and <a href=\"https:\/\/www.henghuahose.com\/pt\/product\/npt-male-adapter-1n\/\" target=\"_blank\" rel=\"noopener\">the 1N adapter (straight)<\/a>. Browse the full <a href=\"https:\/\/www.henghuahose.com\/pt\/product-category\/hydraulic-adapters\/\" target=\"_blank\" rel=\"noopener\">Hydraulic Adapters range<\/a> for the complete SAE J514 JIC, NPT, ORFS and ISO 6162 flange families.<\/p>","protected":false},"excerpt":{"rendered":"<p>The 4NN adapter is an NPT male hollow hex plug that blanks an unused pipe port with an internal hex socket drive. Its American tapered thread to ANSI\/ASME B1.20.1 seals on the engaged thread flanks, and the body is closed, so nothing flows through it. Six sizes from Z1\/8\\&#8221; to Z1\\&#8221; are offered in carbon steel with trivalent chromium zinc plating or 304 \/ 316 stainless steel. The low installed profile suits recessed and congested ports.<\/p>","protected":false},"featured_media":5206,"comment_status":"open","ping_status":"closed","template":"","meta":{"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[1426],"product_tag":[1859,1741,1861,1860,1862],"class_list":{"0":"post-5208","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-hydraulic-adapters","7":"product_tag-4nn-adapter","8":"product_tag-hydraulic-plug-adapter","9":"product_tag-internal-hex-pipe-plug","10":"product_tag-npt-male-hollow-hex-plug","11":"product_tag-npt-plug","12":"desktop-align-left","13":"tablet-align-left","14":"mobile-align-left","15":"ast-product-gallery-layout-horizontal-slider","16":"ast-product-tabs-layout-horizontal","18":"first","19":"instock","20":"shipping-taxable","21":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>4NN Adapter | NPT Male Hollow Hex Pipe Plug, Low Profile<\/title>\n<meta name=\"description\" content=\"4NN adapter: an NPT male hollow hex plug that blanks a B1.20.1 pipe port with an internal hex drive. Six sizes from Z1\/8 to Z1 in, with a low installed profile.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.henghuahose.com\/pt\/product\/npt-male-hollow-hex-plug-4nn\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"4NN NPT Male Hollow Hex Plug - Low Profile Internal Hex NPT Blanking 4NN Adapter\" \/>\n<meta property=\"og:description\" content=\"4NN adapter: an NPT male hollow hex plug that blanks a B1.20.1 pipe port with an internal hex drive. Six sizes from Z1\/8 to Z1 in, with a low installed profile.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.henghuahose.com\/pt\/product\/npt-male-hollow-hex-plug-4nn\/\" \/>\n<meta property=\"og:site_name\" content=\"HENGHUA\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-18T09:14:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/npt-male-hollow-hex-plug-4nn.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"750\" \/>\n\t<meta property=\"og:image:height\" content=\"723\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"18 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.henghuahose.com\\\/product\\\/npt-male-hollow-hex-plug-4nn\\\/\",\"url\":\"https:\\\/\\\/www.henghuahose.com\\\/product\\\/npt-male-hollow-hex-plug-4nn\\\/\",\"name\":\"4NN Adapter | NPT Male Hollow Hex Pipe Plug, Low Profile\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.henghuahose.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.henghuahose.com\\\/product\\\/npt-male-hollow-hex-plug-4nn\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.henghuahose.com\\\/product\\\/npt-male-hollow-hex-plug-4nn\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.henghuahose.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/npt-male-hollow-hex-plug-4nn.jpg\",\"datePublished\":\"2026-09-18T09:14:41+00:00\",\"dateModified\":\"2026-09-18T09:14:42+00:00\",\"description\":\"4NN adapter: an NPT male hollow hex plug that blanks a B1.20.1 pipe port with an internal hex drive. 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