5B9 Adapter – 90° Elbow BSP Male 60° Seat to BSP Female ISO 1179 Adapter

1. What a 5B9 Adapter Does

A 5B9 adapter is a 90° elbow hydraulic adapter with a BSP male 60° cone seat stud end at port E and a BSP female end made to ISO 1179 at port F. It turns the connection through a right angle and converts between the port side and the line side of the circuit.

Both ends must match their mating parts exactly, in thread form, seat geometry 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 BSPP female end dimensioned to ISO 1179, which receives a BSP male stud end with the matching 60° cone in a pressure-tight joint.

2. 5B9 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 G1.1/4″x11. It screws into a BSPP port with a 60° cone, or into a flat-face port where a bonded seal washer is used.

The cone joint is metal to metal at the seat, so it needs no separate sealing element at this end and releases cleanly for service.

2.2 Connection 2 – BSP female, ISO 1179 (port F)

Port F is a BSPP female end dimensioned to ISO 1179, from G1/8″x28 to G1.1/4″x11. ISO 1179 covers ports and stud ends with ISO 228-1 threads in the BSPP family, including the 60° cone seat configuration, which is why a stud end produced to that standard makes up correctly in this port.

The female body is the longer of the two legs on this series, and the B dimension in the chart below gives that leg as drawn, so the elbow clears the mating stud end before it seats. Every part number in the 5B9 chart is a same-size elbow, carrying one thread size at both ends.

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 ISO 1179 female end produced in one part. Threads are gauged 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, supplied in NBR, FKM and EPDM. The female ISO 1179 end is a cone joint and takes no separate seal.
• 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 at the male end, where a bonded seal may be fitted:

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 port E, column B is the leg dimension at the ISO 1179 female port F, and S1 is the hex dimension of the drawn wrench feature.

The chart above reproduces the full 5B9 range. Note that the published range stops at G1.1/4″x11; for larger ports, ask HENGHUA about a special or about the same configuration in another series.

3. How to Read a 5B9 Part Number

A 5B9 part number has two elements: the series prefix and the size code.

• 5 – the BSP male to BSP female ISO 1179 family in the British Adapters range.
• B – BSP thread, here BSPP to ISO 228-1.
• 9 – the 90° elbow version. The 5B family is also supplied as a straight adapter, series 5B.
• 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, 12 is 3/4, 16 is 1, 20 is 1.1/4.

Worked example: 5B9-08. Port E is a G1/2″x14 male 60° seat end and port F is a G1/2″x14 female end to ISO 1179. From the chart, A is 39 mm, B is 31 mm and S1 is 30 mm. The longer B leg is the female ISO 1179 end, which is the dimension to check when the elbow has to clear a component beside the port.

A 5B9 adapter has a single size code, so it is not ordered as a reduced combination. If the two ports differ in size, use a straight adapter with an elbow in the line, or send the requirement to HENGHUA as a special.

4. Installation and Fitment

Port E is a cone seat joint and port F receives a cone seat stud end to ISO 1179. In both cases the thread provides clamping force and the cone carries the seal, so start each joint by hand, 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 the male end is used on a flat-face port, fit a new bonded seal washer and tighten until the washer is compressed and the metal faces meet.
• Make up the male end first, set the elbow direction, then connect the female end so the hose is not twisted.
• Keep the internal cone of port F and the seat at port E clean and free of swarf, paint or old sealant.

Common fitment errors and the symptoms they cause:

This elbow may be reused if both cones, the threads and the hex are undamaged. Replace bonded seals and O-rings at every reassembly, and check the cone for an unbroken contact ring.

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, which is the reason to choose it over a straight adapter in four recurring situations.

Routing in a tight envelope: on a manifold, pump or valve block, the space directly in front of a port is often occupied by another component. The elbow turns the line away immediately, so the hose or tube leaves parallel to the machine surface instead of projecting into the free space.

Protecting the hose bend: a hose that leaves a port on the port axis and then has to bend sharply behind the machine is bent at a radius smaller than its design allows. The elbow moves that direction change into the steel body.

Respecting the minimum bend radius: every hose has a minimum bend radius below which the reinforcement is stressed and service life falls. Fitting an elbow at the port lets the hose run at a radius it was designed for, which matters most on the larger sizes in this range where the hose itself is stiffer.

Access and service: with the connection turned sideways, the wrench has room to move and the joint can be checked or retightened without dismantling the surrounding assembly.

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 and a small pressure drop. Keep the elbow bore matched to the hose and tube bore, avoid stacking several 90° elbows in one short run, and use 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: a machine with BSPP ports is connected to a line whose stud ends are made to ISO 1179. The 5B9 provides the BSPP male interface at the port and the ISO 1179 female interface at the line, and turns the run at the same time.

Repair and replacement: when a hose end or a stud end fails, the elbow restores the connection at both ends and preserves the existing routing without modifying the port.

High-pressure test benches: elbows keep hoses clear of the bench frame and of the operator’s working area, and they let several lines leave one manifold with parallel runs.

OEM assembly lines: a fixed 90° geometry gives every unit the same routing, shortens the hose used, and removes the assembly step where a straight fitting is 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 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 to ISO 1179, 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. End configuration: state which end is male and which is female, and whether each seals on a cone, on a bonded seal washer or on an O-ring, because one thread size is supplied in several sealing configurations.

Useful equivalences within the HENGHUA range:

If the port is BSPT instead of BSPP, order a BSPT series rather than forcing a 5B9 adapter into a taper port.

7. Ordering, Packaging and Delivery

To place an order or ask for a quotation, send the following: series code (5B9), the full part number, the thread size at port E and port F, the seal material where a bonded seal is used (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 5B9 size? Read the two ports, not the hose. Measure the thread outside diameter and count the threads per inch, then match to ISO 228-1 to get the G size. The 5B9 elbow carries one size at both ends, so a single code describes the part, for example 5B9-12 for G3/4″x14 at both ends.

Q4. What seal material should I select for my fluid and temperature? The 5B9 seals on a 60° cone at both connections, so no seal element is needed inside the adapter itself. Where a bonded seal is fitted at the male end on a flat-face port, NBR suits mineral hydraulic oil from approximately -30°C to +100°C, FKM approximately -20°C to +200°C, and EPDM water and steam service approximately -40°C to +120°C. 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 5B9 and the 2B9? Both are 90° elbows with a BSP male 60° seat end at port E. The 5B9 has a BSP female end dimensioned to ISO 1179 at port F, while the 2B9 has a BSP female 60° cone end. Choose the 5B9 when the part drawing or the port specification names ISO 1179, and the 2B9 when the line end is a 60° cone stud end already in service.

Q8. Why does the 5B9 range stop at G1.1/4″x11? The published 5B9 chart covers seven sizes from G1/8″x28 to G1.1/4″x11. Ports larger than that are served by other series in the same range or by a drawing-based special. Send the thread size, the material and the quantity and HENGHUA will confirm what can be supplied.

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