5T9-SP 90 Degree Elbow BSPT Male BSPT Female Adapter – Elbow BSPT Male Female 5T9-SP Adapter

1. What a 5T9-SP Adapter Does

The 5T9-SP adapter is a 90° elbow hydraulic adapter with a BSPT male taper thread on one end and a BSPT female taper thread on the other. It turns the fluid path through a right angle and converts gender at the same time, taking a taper threaded port on one axis and presenting a taper threaded female connection on the other.

The core value of this part is that both connections match their mating threads exactly: the male end has to match the internal taper thread of the port, and the female end has to match the external taper thread of the stud end or hose fitting that enters it. A thread match at both ends is the precondition for a leak-free conversion point in a confined space.

Sealing on this series follows ISO 7-1, the standard for pipe threads where the pressure-tight joint is made on the threads. The taper presses the crests of the external thread into the flanks of the internal thread, so the metal-to-metal contact along the flanks holds the fluid. Both joints on a 5T9-SP adapter therefore require thread sealant or PTFE tape, and neither may be over-tightened, because a taper thread expands the port as it enters and can split the boss.

2. 5T9-SP Adapter Specifications

2.1 Connection 1 – BSPT male taper thread (end E)

• Thread family: British Standard Pipe taper thread, ISO 7-1.
• Designation: R external taper thread, for example R1/4″X19.
• Gender: male.
• Sizes available on end E: R1/8″X28, R1/4″X19, R3/8″X19, R1/2″X14, R3/4″X14, R1″X11, R1-1/4″X11, R1-1/2″X11.
• Sealing method: thread flank interference, with thread sealant or PTFE tape applied to this male thread before assembly.
• Mating port: an internal taper thread to ISO 7-1, designated Rc, or Rp where a parallel internal thread is specified against a taper male end.

2.2 Connection 2 – BSPT female taper thread (end F)

• Thread family: British Standard Pipe taper thread, ISO 7-1.
• Designation: Rc internal taper thread, for example Rc1/4″X19.
• Gender: female.
• Sizes available on end F: Rc1/8″X28, Rc1/4″X19, Rc3/8″X19, Rc1/2″X14, Rc3/4″X14, Rc1″X11, Rc1-1/4″X11, Rc1-1/2″X11.
• Sealing method: thread flank interference. Apply the sealant or tape to the male thread of the part fitted into this female end, not inside the female thread.
• Mating part: a BSPT male stud end or hose fitting with an R external taper thread to ISO 7-1, on the second axis at 90° to end E.

Because the two connections sit at 90° and differ in gender, this series is used where a taper threaded port has to feed a hose that must leave at a right angle, and the hose end that is available carries a taper male thread.

2.3 Construction and Materials

• The elbow body is machined from bar stock on CNC lathes, with the external taper thread and the internal taper thread cut and checked with thread gauges before finishing.
• Body material options: carbon steel, 304 stainless steel, 316 stainless steel, with brass available on request.
• Plating options: trivalent chromium zinc plating (Cr3+) or zinc-nickel plating. Carbon steel with zinc plating suits general hydraulic service; 304 and 316 stainless steel are selected for corrosive and offshore environments.
• No elastomer is fitted in this series. Each joint is made on the taper thread, so the sealant or tape chosen by the installer is part of the sealing system.
• The hex across flats S1 allows the elbow to be tightened with a spanner on both legs and to be positioned on the required axis before the final turn.

2.4 Pressure and Temperature

Working pressure for these sizes is confirmed per order by HENGHUA engineering, based on the sealing method, thread size and material selected. No single figure applies across the range, because the strength of a taper threaded joint depends on the thread size, the wall thickness of the body and of the mating port, and the depth of thread engagement at each end.

Temperature behaviour follows the body material and the thread sealant or tape in use. Carbon steel with zinc plating is suitable for general hydraulic service, while 304 and 316 stainless steel are selected for corrosive service. Where an elastomer is used on a related series in this catalogue, the material ranges are approximately -30°C to +100°C for NBR, -20°C to +200°C for FKM and -40°C to +120°C for EPDM. These are material facts for the seals supplied across the range and help you align a seal choice with the fluid in your circuit.

2.5 Part Number and Dimension Table

Column notes: PART NO. is the ordering code for the complete elbow. E is the male taper thread and F the female taper thread. A and B are the two leg dimensions of the elbow as drawn on this page, in millimetres. S1 is the hex across flats, in millimetres. Confirm the exact measurement scheme against the outline drawing before you design around these figures.

3. How to Read a 5T9-SP Part Number

The code has three parts: the series identifier, the size code and the suffix. The series identifier is 5T9, and the SP suffix marks the taper thread (ISO 7-1) version of the series rather than the parallel thread version.

• 5T – adapter family that takes a male taper end and a female taper end.
• 9 – 90° elbow configuration.
• SP – BSPT variant of the series, with R and Rc taper threads.

Two digit size codes use the standard British pipe sizes: 02 = 1/8″, 04 = 1/4″, 06 = 3/8″, 08 = 1/2″, 12 = 3/4″, 16 = 1″, 20 = 1-1/4″, 24 = 1-1/2″, 32 = 2″. In this series each part number carries one size code, because the male and female ends are matched in size along the table.

Worked example: 5T9-08SP is a 90° male x female adapter with R1/2″X14 on the male end, Rc1/2″X14 on the female end, leg dimensions A 40.8 mm and B 31.5 mm, and a 30 mm hex across flats. If you need a male end and a female end of different BSPT sizes, tell us both sizes with your inquiry and we will confirm the equivalent special or the two part solution.

4. Installation and Fitment

• Inspect both taper threads, the external thread on end E and the internal thread on end F, together with the mating port and the mating stud end. Burrs, swarf or a previously stretched thread will not seal.
• Clean the threads and apply thread sealant or PTFE tape to the male thread. Keep the sealant or tape off the first thread crest so that nothing enters the fluid path. On end F the sealant goes on the male thread of the part being fitted into the adapter.
• Plan the final orientation of the female end before final tightening. Screw end E into the port by hand until it seats, then tighten with a spanner on the hex until the female leg points where the hose has to go. If the elbow passes the required angle, back it out and restart with fresh sealant or tape instead of tightening further.
• Tighten to snug plus the small additional movement needed to reach the angle. Stop when resistance rises sharply: a taper thread expands the port as it enters, and over-tightening can split the port boss.
• Support the port body while tightening, especially on aluminium or thin-wall manifolds, so that the reaction torque is not carried by the boss alone.
• Taper threaded joints are not designed for repeated assembly. Each reassembly distorts the thread slightly and requires fresh sealant. Replace the elbow if either thread shows flattening or if a thread gauge shows the taper has been drawn out.
• Common fitment errors and symptoms: cross-threading on the first turn; too little sealant, which shows as a slow weep at the thread; over-tightening, which shows as a cracked port or a distorted female end; and fitting a parallel BSPP stud end into the Rc female thread, which will not seal because the forms differ.

5. Applications and Industries

Typical application tags for this series: hydraulic systems, water jetting, oil and gas, industrial equipment, construction machinery, agriculture, marine and material handling.

• Cross-standard equipment integration. A manifold or valve with an ISO 7-1 taper threaded port has to feed a hose that leaves at 90° and ends in a taper male thread. This elbow makes the direction change and the gender change in one part.
• Repair and replacement. On older machines the port is often damaged or the original elbow is missing. A correctly sized BSPT male x female elbow restores the connection at the point of failure without modifying the hose.
• High-pressure test benches. Panels and blocks drilled with taper threaded ports use this elbow to bring gauge and instrument lines out at a right angle and present a female thread for a coupling.
• OEM assembly lines. Because the part is one piece and the female leg can be oriented during installation, it suits production lines where the hose must leave the port in a fixed direction and the envelope is set by dimensions A and B.

6. Replacement and Cross-Reference Guide

Identify a replacement by standard and sealing method, never by brand. This catalogue is organised by thread family and sealing method so that you can move between series without a brand reference.

Measure these three things on the part you want to replace:

1. Thread size and pitch at both ends. Measure the diameter of the external thread and the bore of the internal thread, then count threads per inch. In this range, 1/8″ is 28 threads per inch, 1/4″ and 3/8″ are 19, 1/2″ and 3/4″ are 14, and 1″ and above are 11.
2. Taper or parallel. Check each thread along its length. A parallel thread holds the same diameter; a taper thread measures smaller at the first thread and grows towards the shoulder.
3. Sealing method. This elbow seals on the thread flanks with a sealant. If the part you are replacing seals on a 60° cone seat, a bonded seal or an O-ring on a flat face, it belongs to a BSPP series, not to this one.

7. Ordering, Packaging and Delivery

To order, send us the series code, the full part number, both thread sizes, the seal material or sealant requirement, the plating and the quantity. A complete requirement for this series reads: 5T9-SP, part number 5T9-12SP, end E R3/4″X14, end F Rc3/4″X14, carbon steel with trivalent chromium zinc plating, 500 pieces.

Parts are supplied in bulk cartons or in individual bags for distributor shelves, with labels showing the part number and both thread sizes. Sample orders and mixed cartons are available so that you can validate thread fit, the elbow angle and the leg dimensions before a production order. Lead time, packing format and labelling are confirmed per order for your warehouse or your production line.

8. FAQ

Q1. What is the difference between BSPP and BSPT, and can they be interchanged? BSPP is a parallel thread to ISO 228-1, where the joint is sealed on a 60° cone seat, a bonded seal or an O-ring rather than on the thread. BSPT is a taper thread to ISO 7-1, where the pressure-tight joint is made on the thread flanks with a sealant. They are not interchangeable: a taper male thread does not seal in a parallel port, and forcing one in damages the port.

Q2. What is the difference between a 60° cone seat and a bonded seal, and which should I choose? Both belong to the BSPP family and neither applies to this taper threaded series. A 60° cone seat seals by metal-to-metal contact between the cone of the stud end and the cone of the port, so it needs no separate part. A bonded seal is a metal washer with an elastomer insert that seals on a flat face. Where your circuit uses BSPP ports, choose the cone seat for higher pressures and the bonded seal for plain flat faced ports.

Q3. How do I identify the correct 5T9-SP size? Measure the external thread diameter and the internal thread bore, count threads per inch at each end, and match them to a row of the table in 2.5. This series lists matched male and female sizes, so one code gives both thread designations. When in doubt, send a photo with a rule across each thread and we will identify the row for you.

Q4. What seal material should I select for my fluid and temperature? This series seals on the thread flanks and carries no elastomer, so the first choice is the thread sealant or tape, which must be compatible with the fluid. Where a related series in this catalogue uses an elastomer, NBR covers approximately -30°C to +100°C, FKM -20°C to +200°C and EPDM -40°C to +120°C. Confirm the sealant choice for your fluid with us before assembly.

Q5. How is the working pressure of this adapter determined? Working pressure is confirmed per order by HENGHUA engineering, based on the sealing method, thread size and material selected. It is not published as one figure for the range, because the strength of a taper threaded joint depends on the thread size, the wall thickness of the body and of the mating parts, and the depth of engagement at each end.

Q6. What is the minimum order quantity and can I get samples? Sample quantities are available so that you can check thread fit, angle and dimensions before committing to a production order. Minimum order quantity depends on the size, material and plating, and is confirmed in the quotation. Mixed cartons can be arranged for distributors who stock several sizes of this series.

Q7. Can the female end of the elbow be positioned after tightening? No. The orientation is set by the final tightening of the male end, and a taper thread cannot be turned back to adjust position without losing the seal. Decide the direction of the female leg before final tightening; if the elbow passes the required angle, remove it and refit with fresh sealant or tape.

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