1BL BSP Male to Metric Male Adapter with Bonded Seal – 1BL Adapter

The 1BL adapter is a straight hydraulic conversion fitting that joins a BSPP (G thread) port to a metric (M thread) port in one machined body. Connection 1 is a BSP male stud built for double use: it seals on an ISO 1179 60° cone seat or on a bonded seal against a flat face. Connection 2 is a metric male stud with its own bonded seal. HENGHUA produces both stud ends to the published port standards, so each end matches the port it is specified against, which is the precondition for eliminating leakage at the conversion point.

1. What a 1BL Adapter Does

A 1BL adapter is a rigid straight adapter for systems in which a BSPP (G) threaded port must accept a metric (M) stud end, or a metric port must accept a BSPP line. It converts thread family without converting flow direction, and it carries the seal at each connection through the geometry of the stud end itself.

The female side of the joint is sealed in one of two ways. Against an ISO 1179 port with a 60° cone, the BSP male end centres on the cone and seals metal to metal. Against a flat-faced port, the same end seals on a bonded washer (Dowty-type) that is compressed between the hex shoulder and the port face.

The metric end is a male stud with a bonded seal seat, so the joint is completed on a flat face at the metric side. Because the two ends follow two different thread standards, the part is ordered by the pair of sizes it connects, for example a G1/2″X14 BSPP end on a M22X1.5 metric end. It is a BSP adapter on one side and a metric adapter on the other, so it is often ordered as a bonded seal adapter for a flat-faced port.

2. 1BL Adapter Specifications

The specification is written as two mirrored stud ends, so a buyer can read off which end goes to which port before ordering.

2.1 Connection 1 – BSPP male, double use for 60° cone seat or bonded seal

2.2 Connection 2 – Metric male with bonded seal

Note on geometry: ISO 8434-6 describes the 60° cone stud end family that corresponds to the BSPP 60° seat. ISO 6149-3 describes the metric port and stud end family with O-ring sealing. Where a metric port is a 60° cone port rather than a flat-faced port, select the stud end that matches the port drawing and confirm the seal type with HENGHUA engineering before ordering.

2.3 Construction and Materials

2.4 Pressure and Temperature

Working pressure for this series is governed by the size, the wall thickness of the body, the sealing method and the material selected, and it is confirmed per order by HENGHUA engineering against the drawing. No single pressure figure applies to the whole series, so the rated pressure is quoted with the quotation for the specific part number and material.

Seal material temperature ranges are material facts, not ratings of the assembly: NBR approximately -30°C to +100°C; FKM (Viton-type) approximately -20°C to +200°C; EPDM approximately -40°C to +120°C. Carbon steel with zinc plating suits general hydraulic service; 304 and 316 stainless steel are specified for corrosive and offshore environments.

2.5 Part Number and Dimension Table

Column meanings: PART NO. is the ordering code; THREAD E is the BSPP end; THREAD F is the metric end; SEAL F end is the bonded washer code at the metric (F) end; A is the length of the BSP stud end in mm; B is the length of the metric stud end in mm; L is the overall length in mm; S1 is the hex across flats in mm.

Table note: the row between 1BL-12-27 and 1BL-16-27 is printed in the source chart with the code 1BJ-12-33, while its size data (G3/4″X14 to M33X2, ZHD-33) follows the 1BL pattern. Confirm the correct ordering code for this row with HENGHUA before ordering: [VERIFY WITH SUPPLIER]. All dimensions are in mm and are reproduced from the current chart for this series. Confirm the drawing for the exact part number at order stage.

3. How to Read a 1BL Adapter Part Number

The code has three blocks. 1BL is the series: BSP male double use for 60° seat or bonded seal, with a metric male end carrying a bonded seal. The first number after the prefix is the BSPP (G) size, counted in sixteenths of an inch. The second number is the metric thread nominal diameter in mm.

Worked example: 1BL-08-22 decodes as 1BL series, 08 = 8/16 in = G1/2″X14 on the BSPP side, 22 = M22X1.5 on the metric side. The chart gives the bonded washer code ZHD-22, A = 16 mm, B = 14 mm, L = 41.5 mm and hex S1 = 30 mm.

Size code reference from the table above: 02 = G1/8″X28, 04 = G1/4″X19, 06 = G3/8″X19, 08 = G1/2″X14, 10 = G5/8″X14, 12 = G3/4″X14, 16 = G1″X11, 20 = G1.1/4″X11. On the metric side the code is the nominal diameter, so 10 = M10X1, 14 = M14X1.5, 16 = M16X1.5, 18 = M18X1.5, 22 = M22X1.5, 27 = M27X2, 33 = M33X2, 42 = M42X2.

4. Installation and Fitment

Prepare the threads and check the port face first. Clean both ports, remove burrs and old sealant residue, and confirm the port face is flat and unmarked, because a bonded seal cannot bridge a scored or dented face. Blow out the line before assembly so no swarf reaches the seat.

Tighten in the sequence that suits the seal. With a bonded washer, fit the washer over the metric stud first, then run the adapter in finger-tight and tighten to a snug, firm seat that compresses the washer without extruding it. Do not add a second washer to take up thread length, and do not use thread tape or paste on a bonded seal or a 60° cone seat joint, because the seal is made on the face or the cone, not on the thread flanks. The tightening angle and torque are confirmed per order and per size by HENGHUA engineering.

Alignment matters on a straight adapter. Support the hose or tube so the adapter does not carry bending load, and never use the hex of one end to jack the other end into position. Reuse policy: bonded washers and O-rings are single-use items, replace them whenever the joint is broken; the steel body, if the threads and the seat are undamaged, can be refitted with a new washer.

Common fitment errors and symptoms: a re-used or mis-sized washer shows as weeping at the hex shoulder; a crossed or over-tightened metric thread shows as a slow leak that does not respond to further tightening; a 60° cone end assembled onto a flat-faced port refuses to seal because the two sealing concepts do not meet; and a BSPT male end turned into a BSPP port damages both threads, since a taper thread and a parallel thread are not interchangeable.

5. Applications and Industries

Application tags: hydraulic systems, water jetting, oil and gas, industrial equipment, construction machinery, agriculture, marine, material handling.

Cross-standard equipment integration. Where an imported machine carries ISO 1179 BSPP ports and the replacement hose assemblies are built with metric stud ends, a 1BL adapter makes the junction inside the existing footprint instead of forcing a change of hose or port.

Repair and replacement. Maintenance teams keep this series for breakdown work on mixed-standard machinery, because one part number covers both the thread conversion and the seal at the metric end.

High-pressure test benches. Test circuits often mix BSPP manifolds with metric instrument and valve ports, and the rigid straight body of this series holds position on a panel.

OEM assembly lines. For a new build, the series can be supplied to a drawing with a fixed plating and seal choice, so the line receives one part number instead of a two-piece adapter and washer set.

6. Replacement and Cross-Reference Guide

Cross-reference this series by standard, thread and sealing method only, never by another maker’s catalogue number. Start by identifying the two thread families on the part you are replacing, then match the sizes.

Measure these three things. First, the thread: measure the outside diameter of each male thread and count the threads per inch, then compare with the G series (for example G1/2″X14) and the metric series (for example M22X1.5) in the table above. Second, the seat: look at the port the adapter entered. A 60° cone inside the port means the BSP end seals on the cone; a flat face means it seals on a bonded washer. Third, the seal: measure the washer bore and outside diameter, and read the stamp on an existing washer if one is present.

Replacement rules. A metric male end with a bonded seal can be replaced by the same size from this series; if the mating port is a 60° cone metric port rather than a flat-faced port, you need a different stud end family and should send the port drawing. If the replaced part has a BSPT (taper) end, this series is not the equivalent, because the 1BL BSP end is a parallel G thread that seals on a cone or a face, not on the thread flanks.

7. Ordering, Packaging and Delivery

To order, give the series code plus the full part number, the two thread sizes, the seal material, the plating and the quantity, for example: 1BL series, 1BL-08-22, G1/2″X14 to M22X1.5, FKM bonded washer, trivalent chromium zinc plating on carbon steel, 500 pieces. If the fluid, ambient temperature or the port drawing is unusual, send it with the inquiry and the seal choice can be reviewed.

Packaging. Parts are packed in cartons with the part number and quantity on the label, in bulk or in poly bags as the order requires, and can be labelled for distributor shelves or for direct-to-line OEM delivery. Mixed-size cartons are labelled line by line.

Samples and lead time. Sample quantities are available for validation before a production order, and lead time is confirmable per order and per size once the specification is fixed.

8. FAQ

What is the difference between BSPP and BSPT, and can they be interchanged? BSPP (G thread, ISO 228-1) is a parallel thread where pressure tightness is not made on the threads, so the joint seals on a 60° cone seat or on a bonded washer against a flat face. BSPT (R, Rc, Rp thread, ISO 7-1) is a taper thread where pressure tightness is made on the threads themselves and a sealant is required. They are not interchangeable: a taper male forced into a parallel female port damages both threads and will not seal reliably.

What is the difference between a 60° cone seat and a bonded seal, and which should I choose? The 60° cone seat seals metal to metal where the male cone meets the matching cone in the port, and it needs no extra sealing element. A bonded seal (Dowty-type washer) seals on a flat face and is compressed between the hex shoulder and the port face. Choose by the port you have: a port with a 60° cone calls for the cone seat, a flat-faced port calls for the bonded washer. This series supports both on the BSP end.

How do I identify the correct 1BL size? Read the two threads off the ports, not off the old adapter alone. Measure the outside diameter and threads per inch on the BSPP side and match it to the G column, then measure the metric stud and match its nominal diameter and pitch to the M column, then pick the row where the two meet. Confirm the bonded washer code in that row matches the seal you intend to fit.

What seal material should I select for my fluid and temperature? NBR covers general hydraulic oil service at approximately -30°C to +100°C. FKM (Viton-type) is the choice for higher temperature and for many aggressive fluids at approximately -20°C to +200°C. EPDM suits water-based fluids and steam service at approximately -40°C to +120°C, but it is not compatible with mineral oil. Match the material to the fluid first, then to the temperature.

How is the working pressure of this adapter determined? Pressure is not fixed across the series: it follows the size, the body wall thickness, the sealing method and the material, and it is confirmed per order by HENGHUA engineering with the quotation. The practical limit is usually set by the connected hose or tube and by the port, so quote the system working pressure with your inquiry and the rating can be reviewed against it.

What is the minimum order quantity and can I get samples? Sample quantities can be supplied for validation, including in a nominated seal material and plating, so the joint can be checked on your own port before a production commitment. Minimum order quantity is confirmed per order, since it depends on the size mix and the material. Send the part numbers with the annual quantity and both figures come back with the quotation.

Can this series replace a two-piece adapter and washer set? Yes, in most cases. The metric end carries its own bonded seal seat, so one part number replaces the adapter plus a separate washer and reduces the number of joints in the line. Check that the overall length L in the table fits the space, and that the port face on the metric side is flat.

Are special sizes and drawing-based parts available? Yes. Sizes outside the table, non-standard stud lengths, nominated plating and OEM marking are all made to drawing. Send the drawing with the thread sizes and quantities, and HENGHUA reviews it and confirms tooling, sample and lead time before the order.

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