2B9 Adapter – 90° Elbow BSP Male 60° Seat to BSP Female 60° Cone Adapter

1. What a 2B9 Adapter Does

A 2B9 adapter is a 90° elbow hydraulic adapter with a BSP male 60° cone seat stud end at port E and a BSP female 60° cone end at port F. It turns the connection through a right angle and changes the port gender in one part.

Both ends must match their mating parts exactly, in thread form, seat angle and hex clearance, because a correct match at both ends is the precondition for eliminating leakage at the conversion point.

Port E seals on its 60° cone seat against the cone in the mating port, or on a bonded seal washer against a flat face. Port F is a female 60° cone end that receives a BSP male stud end with a 60° cone, in line with ISO 228-1 and ISO 1179.

2. 2B9 Adapter Specifications

2.1 Connection 1 – BSP male, 60° cone seat (port E)

Port E is a BSPP male stud end with a 60° cone seat, offered from G1/8″x28 to G2″x11. It screws into a BSPP port machined to ISO 1179, or into a flat-face port with a bonded seal washer.

The 60° cone joint is metal to metal at the cone, so it holds without a separate sealing element and releases cleanly for service.

2.2 Connection 2 – BSP female, 60° cone (port F)

Port F is a BSPP female end with an internal 60° cone seat, from G1/8″x28 to G2″x11. It accepts a male stud end that carries the matching 60° cone, so it makes a female-to-male adaptation rather than a female-to-female joint.

Because port F is a cone joint as well, the same rule applies at both ends: the cone carries the seal, the thread only provides the clamping force. On a 2B9 adapter, the two ends normally carry the same nominal size, and reduced part numbers such as 2B9-10-08 combine a 5/8 inch male end with a 1/2 inch female end.

2.3 Construction and Materials

The body is machined from bar stock on CNC lathes, with the 90° bend, the male stud end and the female cone end produced in one part. Threads are checked with thread gauges, and the internal cone is inspected for a full contact form before packing.

• Body material options: carbon steel, 304 stainless steel, 316 stainless steel, brass.
• Plating options: trivalent chromium zinc plating (Cr3+), or zinc-nickel plating for more aggressive environments.
• Seal options: the male end uses the 60° cone or a bonded seal washer; bonded seals are available in NBR, FKM and EPDM.
• Hex flats on both legs are dimensioned on the drawing so each end can be tightened with a wrench.

2.4 Pressure and Temperature

Working pressure is not a single figure for the series. It depends on the thread size, the wall thickness at the elbow, the sealing method and the body material. Working pressure for these sizes is confirmed per order by HENGHUA engineering, based on the sealing method, thread size and material selected.

Seal material temperature ranges are material facts and can be used for selection:

Carbon steel with zinc plating suits general hydraulic service. Choose 304 or 316 stainless steel where the adapter sees moisture, washdown or corrosive media.

2.5 Part Number and Dimension Table

All values are millimetres. Thread designations follow ISO 228-1. Column A is the leg dimension at the male end, column B is the female 60° cone seat depth at port F, and S1 and S2 are the hex dimensions of the drawn wrench features.

The chart above reproduces the full 2B9 range, including the four reduced combinations where port E and port F carry different sizes.

3. How to Read a 2B9 Part Number

A 2B9 part number has three parts: the series prefix, the size code, and an optional second size code.

• 2 – the BSP male to BSP female family in the British Adapters range, with the 60° cone seat at the male end and the 60° cone at the female end.
• B – BSP thread, here BSPP to ISO 228-1.
• 9 – the 90° elbow version. The number 4 marks the 45° version in the same range.
• Size code – two digits giving the nominal thread size in sixteenths of an inch: 02 is 1/8, 04 is 1/4, 06 is 3/8, 08 is 1/2, 10 is 5/8, 12 is 3/4, 16 is 1, 20 is 1.1/4, 24 is 1.1/2, 32 is 2.
• Second size code – when two codes are joined by a hyphen, the first code is port E, the male end, and the second is port F, the female end.

Worked example: 2B9-10-08. Port E is a G5/8″x14 male 60° seat end (code 10) and port F is a G1/2″x14 female 60° cone end (code 08). From the chart, A is 35 mm, B is 7.5 mm, S1 is 22 mm and S2 is 27 mm. This is the part to choose when a 5/8 inch port has to feed a 1/2 inch female connection around a corner.

4. Installation and Fitment

Port E is a cone seat joint and port F receives a cone seat stud end. In both cases the thread does not carry the seal, so bring each joint together by hand first, confirm that it turns smoothly, then tighten with a wrench until the cone seats.

• Do not use thread sealant or tape on either end, because both joints seal on a cone and not on the thread flanks.
• Where a flat-face port is used at the male end, fit a new bonded seal washer and tighten until the washer is compressed and the metal faces meet.
• Tighten the male end first, set the elbow direction, then make up the female end.
• Keep the internal cone of port F clean and free of swarf, paint or old sealant before the mating stud end is inserted.

Common fitment errors and the symptoms they cause:

A 2B9 adapter can be reused if the male cone, the internal cone, the threads and the hexes are undamaged. Replace bonded seals and O-rings at every reassembly.

5. Applications and Industries

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

5.1 Why an elbow instead of a straight adapter

A 90° elbow changes the direction of the connection at the port. It also allows the gender change to be made in the same part, which is why an elbow with one male and one female end is chosen in four recurring situations.

Routing in a tight envelope: the space in front of a manifold, pump or valve port is often occupied. The elbow turns the line away immediately, and because port F is female, the mating stud end is bolted in from the side, where there is room for the wrench.

Protecting the hose bend: a hose that leaves a port on the port axis and then has to bend behind the machine can be forced below its design radius. The elbow takes the direction change into the steel body and lets the hose leave in the direction it naturally runs.

Respecting the minimum bend radius: every hose has a minimum bend radius below which the reinforcement is stressed and service life falls. An elbow at the port removes the sharp bend, so the hose works at a radius it was designed for.

Access and service: a female end on the elbow leg gives a flat, open hex that a wrench can reach, which helps on ports buried behind other components. On this elbow this also lets a male hose end be removed without disturbing the adapter.

Fluid-dynamic trade-off: a 90° elbow adds a local pressure loss that a straight adapter does not have, because the flow must turn and the turn creates turbulence. Keep the bore matched to the hose and tube bore, avoid stacking several elbows in a short run, and favour a swept body where the circuit is sensitive to pressure loss. On return, pilot and gauge lines the loss is normally accepted in exchange for the routing benefit.

5.2 Concrete applications

Cross-standard equipment integration: an imported machine with BSPP ports is tied into a line built around a different port standard. The 2B9 gives the BSPP male interface at the port and the female cone connection at the line, while turning the run.

Repair and replacement: when a hose end or a stud end is the part that fails, the male-to-female elbow restores the connection at both ends in one step.

High-pressure test benches: the elbow keeps hoses off the bench frame and out of the operator’s working area, and it lets several female-ended lines leave one manifold in parallel.

OEM assembly lines: a fixed 90° geometry sets a repeatable routing for every unit, shortens the hose used and removes the assembly step where a straight fitting has to be bent by hand.

6. Replacement and Cross-Reference Guide

Identify a replacement by standard and sealing method, never by brand. Three checks settle the identity of the part:

1. Thread: measure the outside diameter over the thread and count the threads per inch, then match to ISO 228-1 (BSPP, parallel, G) or ISO 7-1 (BSPT, taper, R and Rc). Pitch differs between the two families, so a caliper plus a thread gauge is more reliable than a visual match.
2. Seat: confirm the seat at each connection, 60° cone, flat face for a bonded seal, 37° flare to SAE J514, 74° seat, or an O-ring port to ISO 6149-3 or ISO 11926-3.
3. Gender and seal type: state whether each end is male or female and whether it seals on a cone, on a bonded seal washer or on an O-ring, because the same thread size is supplied in several configurations.

Useful equivalences within the HENGHUA range:

If the port is BSPT rather than BSPP, order a BSPT series instead of forcing a 2B9 adapter into a taper port.

7. Ordering, Packaging and Delivery

To place an order or ask for a quotation, send the following: series code (2B9), the full part number, the thread size at port E and port F, the seal material (NBR, FKM or EPDM), the body material and plating, and the quantity. If you work from a drawing rather than a catalogue part number, send the drawing and HENGHUA will confirm the nearest standard part number or quote a special.

Packaging and delivery:

• Standard packing in polyethylene bags inside export cartons, with desiccant where the destination or the season requires it.
• Cartons labelled with part number, thread sizes, material, quantity and batch reference, so a distributor can place the box straight on a shelf.
• Bulk packing and kit packing are available for OEM line delivery.
• Samples are available for validation before a production order; state the quantity and the part numbers you want to test.
• Lead time is confirmed per order, because it depends on part number, material, plating and quantity.

Every batch is checked against the drawing with thread gauges before packing, and the dimensional values on this page are taken from the series chart.

8. FAQ

Q1. What is the difference between BSPP and BSPT, and can they be interchanged? BSPP is the parallel thread defined by ISO 228-1, where pressure tightness is not made on the thread itself. BSPT is the taper thread defined by ISO 7-1, where the joint seals on the thread flanks and needs a sealant. They are not interchangeable: a tapered male end damages a parallel female port, and a parallel male end will not seal in a tapered port.

Q2. What is the difference between a 60° cone seat and a bonded seal, and which should I choose? A 60° cone seat seals metal to metal on a machined cone and needs no separate sealing element. A bonded seal seals on a flat face, using a metal washer bonded to a rubber ring. Choose the cone when the port is machined with a 60° cone to ISO 1179, and the bonded seal when the port face is flat and the joint depends on the washer.

Q3. How do I identify the correct 2B9 size? Read the two ports, not the hose. Measure each thread outside diameter, count the threads per inch and match to ISO 228-1 to get the G size. The first size code is the male end at port E and the second is the female end at port F, so 2B9-10-08 is a 5/8 inch male end with a 1/2 inch female end.

Q4. What seal material should I select for my fluid and temperature? NBR suits mineral hydraulic oil from approximately -30°C to +100°C. FKM suits higher temperatures, approximately -20°C to +200°C, and resists many aggressive fluids. EPDM suits water, water-glycol and steam service from approximately -40°C to +120°C but is not suitable for mineral oil. State the fluid and the working temperature and HENGHUA will confirm the seal.

Q5. How is the working pressure of this adapter determined? Working pressure depends on the thread size, the wall thickness at the elbow, the sealing method and the body material, so the series has no single figure. Working pressure for the sizes you order is confirmed by HENGHUA engineering per order, based on the sealing method, thread size and material you specify.

Q6. What is the minimum order quantity and can I get samples? Minimum order quantity depends on the part number, the material and whether the item is standard or special, and it is quoted with the price. Samples are available for validation, and a sample order can be placed before a production quantity so fit and routing can be checked on the machine.

Q7. What is the difference between the 2B9 and the 5B9? Both are 90° elbows with a BSP male 60° seat end at port E. The 2B9 has a BSP female 60° cone end at port F, while the 5B9 has a BSP female end made to ISO 1179. Order the 2B9 when the line end carries a 60° cone stud end, and the 5B9 when the port or part drawing specifies ISO 1179.

Q8. Can I order a 2B9 with two different thread sizes? Yes. Reduced part numbers such as 2B9-04-06, 2B9-06-04, 2B9-08-06 and 2B9-10-08 combine a larger male end with a smaller female end, or the reverse. If the combination you need is not in the chart, send the two thread sizes and HENGHUA will quote it as a special.

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