Metric Male O-Ring Plug Adapter 4E

Why This Metric Male O-Ring Plug Adapter 4E Passes the Compliance Gate

The metric male O-ring plug adapter 4E is a single-ended plug with a metric male O-ring stud end and a hex head, used to blank off unused ISO 6149 metric ports. The O-ring sits in a shoulder groove and seals against the port face, so the port is closed without thread tape, without sealant and without deforming the port thread.

Ten codes cover threads from M14X1.5 to M45X2, with O-rings from 10X1.9 to 38X3.1. Because the plug seals on the shoulder, it can be opened and refitted during commissioning and flushing, which makes it the standard way to close service ports, spare outlets and test points on a manifold.

Ventajas principales

1. Closes a port without thread sealant – on this metric male O-ring plug adapter 4E the O-ring seals at the shoulder, so no tape, dope or sealant is needed.
2. Ten sizes from M14X1.5 to M45X2 – covering the metric O-ring ports most commonly left spare on manifolds, valves and power units.
3. Reusable during commissioning – the plug can be removed for flushing or testing and refitted with a new O-ring.
4. Compact hex head – hex across flats matches the port size, so the plug can be tightened with a standard wrench.
5. Carbon steel with plated finish – bodies are machined from carbon steel and supplied with a protective plated finish as standard practice.

Especificaciones técnicas

What Is a Metric Male O-Ring Plug?

A metric male O-ring plug is a single-piece closure whose male stud end is threaded to a metric fine pitch and sealed by an elastomer O-ring compressed between the plug shoulder and a chamfered port mouth, as used on ISO 6149 metric O-ring ports. It is not a pipe plug, and it is not a bonded seal plug: the port preparation and the seal are different systems, and the three types cannot be swapped.

Because the metric male O-ring plug adapter 4E has no through passage, it is used purely to close a port. It is not a blanking plate and it does not provide a second connection.

Connection 1 – Port Side E: Metric Male O-Ring Stud End

Connection 2 – Head: Hex

The smallest thread in this series is M14X1.5. If your port is smaller, a different series is required, and the correct part will be confirmed from your port drawing.

Dimensional Data

Full Dimension Table (Part Number Matrix)

All dimensions are in millimetres and are transcribed from the published spec sheet for this series. The source table writes the O-ring cross-section with a lowercase x; the same values are shown here with the standard uppercase X, so 10X1.9 means an inside diameter of 10 mm with a 1.9 mm cross-section. The letter X in a thread callout is the pitch separator, so M14X1.5 means a 14 mm nominal metric thread with a 1.5 mm pitch.

Confirm the port preparation against your drawing before ordering, and note that the larger threads in this matrix should be checked against the actual port because not every metric size appears in the published ISO 6149 lists.

Thread Size and Dash Chart

Material y tratamiento térmico

These values describe standard practice for this series rather than a customer-specific qualification. If your project carries its own material, plating or heat-treatment requirement, send it and the part will be quoted against it.

Working Pressure and Operating Envelope

This series is supplied without a single published pressure rating, because the working pressure is governed by the port standard together with the hose or fitting grade selected, and the finished assembly is only as strong as its weakest member. A plug is normally as strong as the port it closes, and the port material and thread depth usually govern.

Pressure data for the metric male O-ring plug adapter 4E can be issued against ISO or SAE requirements on request. State the intended working pressure and the applicable standard when ordering.

Rango de temperatura

Continuous service temperature is typically -40 °C to +120 °C for a nitrile O-ring in a steel body, and it is set by the sealing element and by the surrounding circuit. Higher temperature service calls for a fluorocarbon elastomer, available on request.

Cómo interpretar la tabla de referencias

The order code has two blocks: the series prefix and the thread size code.

The prefix 4E means that the part is a metric male O-ring plug. There is only one interface, so the code is short and no second size block appears.

Two warnings are worth repeating. The size block identifies the thread, not the hex, and the hex and length are read from the matrix. A metric thread size can also exist in the 60 degree cone system, so the size code alone is never enough to order safely.

Selección y pedido

Selection Checklist / Decision Table

Servicio de referencias cruzadas

Send a photograph of the worn plug, a rubbing of the thread, or the old order code from your own system, and the size of this metric male O-ring plug adapter 4E will be converted free of charge. We quote and supply under the HENGHUA and Globhose brands only; we do not copy or re-brand another manufacturer’s product, and we do not print another company’s part number on any component.

Embalaje y logística

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm that the port is an ISO 6149 metric O-ring port with a chamfered mouth.
2. Check the thread and pitch against the code, and clean the port of swarf and old sealant.
3. Fit a new O-ring to the shoulder groove, free of cuts and dirt.
4. Thread the plug in by hand until the shoulder touches the port face.
5. Tighten to the standard torque with a wrench on the hex flat S.
6. Pressure check the port before returning the machine to service.

Torque and Sealing Notes

Tightening torque is taken from the applicable standard data table for the thread size, not from a rule of thumb. The O-ring needs only enough compression to seat the shoulder, and over-tightening adds nothing except stress on the port thread.

Never use thread tape, dope or liquid sealant on an O-ring face seal plug. The seal is at the shoulder, so sealant on the thread cannot stop a leak there and can introduce contamination into the circuit.

Advertencias sobre la instalación

• Confirm the port preparation before ordering or fitting.
• Use a new O-ring each time the plug is removed and refitted.
• Clean the port face and the shoulder before assembly.
• Use the correct wrench size S and avoid gripping the threads.
• Pressure check the port after fitting and after any maintenance that involved removal.

• Never fit this plug into a tapered pipe thread port.
• Never fit it into a 60 degree or 74 degree cone seat port.
• Never use tape or sealant to stop a leak at the shoulder.
• Never reuse a flattened O-ring.
• Never leave a port open for transport or storage; blank it with the correct plug.

Applications and Industries

Spare and service ports. Manifolds and valve blocks usually carry plugged outlets, and this plug keeps them clean and leak free until a function is added.

Flushing and commissioning. Plugs are removed for flushing and refitted afterwards, which suits a plug that seals on the shoulder rather than on the thread.

Pressure testing. Test points can be plugged after the test, and the plug can be exchanged for a gauge connection without changing the port.

Transport and storage protection. Machined ports stay free of rust and debris when they are closed with a proper plug instead of a plastic cap.

Oil and gas, mobile equipment, and industrial plant. Metric O-ring ports appear on power units, valve packages, presses and mobile machines, and the plated steel body suits normal industrial environments.

Industry tags: hydraulic plug, metric O-ring plug, port plug, blanking plug, ISO 6149, manifold fitting, mobile hydraulics, oil and gas, industrial machinery, repair and maintenance.

Personalización OEM y trazabilidad de la calidad

Private-label marking, laser marking of your own part number, non-standard plating, stainless bodies, special O-ring compounds and made-to-drawing geometries are available on this series. Send a drawing or a sample and a quotation with lead time is returned within 24 hours.

Traceability is handled at batch level: heat number on the label, material test report on request, and third-party inspection such as BV or SGS can be arranged. Hydraulic assemblies are pressure tested as part of the normal flow, and the plug is one link in the chain that closes the port.

Preguntas frecuentes

Q: Is this plug the same as a pipe plug? A: No. This is a metric O-ring face seal plug for ISO 6149 ports, while a pipe plug has a tapered thread and seals on the thread. They are not interchangeable.

Q: Can the plug be reused? A: The body of the metric male O-ring plug adapter 4E can be reused, but the O-ring should be replaced every time the plug is removed and refitted.

Q: What working pressure can this plug carry? A: No single figure applies. Working pressure is governed by the port standard together with the circuit grade, and the finished assembly is only as strong as its weakest member, which is usually the port itself.

Q: Does the matrix include an M12X1.25 plug? A: No. This series starts at M14X1.5, so smaller ports need a different plug series, which can be confirmed from your port drawing.

Q: How tight should the plug be? A: Use the torque value for the specific thread size from the applicable standard data table, applied with a wrench on the hex flat S.

Q: Which material and finish are supplied as standard? A: Carbon steel bodies with a plated finish and nitrile O-rings are standard practice. Stainless steel, zinc-nickel plating and high-temperature elastomers are available on request.

Q: How is the part packed and how fast can it ship? A: Thread protectors and anti-corrosion film, inner bag and export carton, with a batch label carrying the heat number. Standard sizes generally ship in batches in around seven days.

Solicitar un presupuesto

To quote this metric male O-ring plug adapter 4E accurately, send five items: the port thread and pitch, the port preparation, the working pressure and the fluid, the material and finish required, and the quantity with the required delivery date. Where the original part is unknown, send a photograph or a sample and the size will be identified for you.

Quotations are returned within 24 hours, including lead time and packaging details for your destination. Bulk quantities, mixed size containers and private-label marking are all supported.

Browse the full Adaptadores hidráulicos range for the complete family, or contact us to request a quote, mill test reports, and samples.