BSP Female Flat Seat 45° Elbow: 22241 Series

Why This BSP Female Flat Seat Elbow Passes the Compliance Gate

A BSP female flat seat 45° elbow terminates a braided hydraulic hose with a 45° turn and connects it to a male BSPP stud through a flat sealing face. The 22241 series from HENGHUA is a one-piece crimp elbow with G-series parallel threads from G1/4″ to G1.1/4″, covering 6 sizes from -04 to -20. Every unit is cold-forged from carbon steel, heat-treated, plated, and 100% pressure tested before shipment. For OEM buyers this elbow is a compliance gate; for maintenance teams it is the classic British flat-seat termination for 45° routing.

• BSPP flat seat female end: the parallel G thread (ISO 228-1) terminates in a flat sealing face, the British flat-seat practice per BS 5200. The joint seals with the seal element carried by the mating male stud, typically a bonded washer or an O-ring, compressed between the two faces.
• 45° crimp elbow for braided hose: the one-piece body turns the hose axis by 45°, and the stem is engineered for braided constructions; for spiral hose, order the 22242 series.
• Flat seat versus cone seat: unlike the 60° cone seat family, this female end seals on a flat face, which makes it the standard choice in UK and Commonwealth circuits using bonded-washer studs.
• OEM gate check: full dimensional and material conformance with thread form per ISO 228-1, and material test reports (MTR) available for every batch.

Core Advantages

1. Reliable flat-seat sealing: the flat face gives a wide, stable sealing area for the bonded washer or O-ring of the mating stud, with a simple visual check after assembly.
2. 45° space-saving routing: the elbow turns the hose at 45°, keeping the bend radius of the hose intact while changing the direction of the line.
3. -40°C to +120°C operating range: suited to return, pressure, and cooler circuits across mobile and industrial equipment.
4. 96 to 1000 h salt spray options: trivalent zinc (96 h), zinc-nickel (720 h), or Dacromet (1000 h), matched to your environment.

Technical Specifications

What Is a BSP Female Flat Seat 45° Elbow?

This elbow terminates a braided hose with the British flat-seat connection, the parallel-thread system defined by BS 5200 and used across UK, Commonwealth, and Middle East hydraulic circuits. On the port end, the fitting carries a BSPP parallel thread (G series, thread form per ISO 228-1) and a flat sealing face at the bottom of the thread. The G thread is parallel and does not seal by itself; it only draws the joint together. The sealing element lives on the mating side: a male BSPP stud with a recessed cone normally carries a bonded washer, or an O-ring in the flat-seat variant, and tightening compresses that element against the flat face of this female end.

The flat face is the design point: it must stay clean and undamaged, because the washer or O-ring seats directly on it. This is what separates the flat seat family from the 60° cone seat family: a cone seat seals metal-to-metal against a male cone, while a flat seat seals by compressing an elastomer element against a flat face. The two female ends are not interchangeable, and neither is compatible with a BSPT taper thread, which seals by thread interference instead.

On the hose end, the elbow is a crimp termination for braided hose. The 45° angle changes the direction of the hose run by half of a right angle, which is the routing choice when a 90° turn is too sharp for the hose bend radius and a straight fitting cannot reach the port. Typical positions are cylinder ports, valve blocks, cooler connections, and pump outlets. The series covers six sizes from -04 to -20; the largest size carries the -W suffix shown on the drawing, and the suffix must be kept in the order code.

Dimensional Data and Threads

Full dimension drawings with A, C, H, and S2 callouts are supplied as PDF and CAD (STEP/DWG) files. Because this is a crimp fitting, the two process-critical parameters are the hose insert depth and the crimp outside diameter; both are hose-series specific and are listed in the crimp data sheet that accompanies every order.

Full Dimension Table (Part Number Matrix) {#by-thread-size}

Read the table with your BSPP thread (E) and your hose size (dash). The part number is the order code; copy it directly into your inquiry or purchase order. The pattern is 22241-[thread dash]-[hose dash]: for example, 22241-12-12 has a G3/4″ thread and suits a -12 (20 mm) braided hose.

The dimensions shown are for the braided-hose version. For spiral hose, use the 22242 series, whose stem is longer for the extra reinforcement layers.

Material and Heat Treatment

Cold forging preserves the grain flow of the steel, which raises fatigue resistance under pressure pulsation. Each heat-treatment batch is hardness-tested and recorded, so the hardness number on the MTR matches the parts you receive.

Working Pressure

The exact rating for your part number and hose combination is confirmed on the datasheet and by our engineers before shipment. Note that the assembled joint rating also depends on the bonded washer or O-ring selected for the mating stud; use a seal element rated for your circuit pressure.

Pressure-Temperature Operating Envelope

The steel body holds full rated pressure across the whole temperature window. In a crimped assembly the working pressure is governed by the weakest component, normally the hose or the seal element; use the hose derating curve for the system.

Selection and Ordering

The 22241 series covers the flat seat segment of BSP hydraulic hose fittings for braided hose, from -04 to -20, so most orders can be placed directly from the tables below.

How to Read the Part Number Matrix

Find your BSPP thread in the E column, then the hose dash size you use. The intersecting row gives the order code, for example a G3/8″ thread with a -06 hose gives 22241-06-06. If your combination is not listed, send us both sizes; a custom BSP flat seat elbow is machined on request.

BSPP Thread Size Chart

Use this chart to identify the thread on your port and to confirm the matching hose dash sizes. BSPP G threads are parallel; they are identified by measuring the thread outside diameter and counting the threads per inch.

Cross Reference Service

Most maintenance teams buy against a legacy part number printed on the old drawing. Send us the OEM or distributor part number you currently use, with a photo of the fitting if possible. Our engineers identify the thread, sealing face type, hose size, and bend angle, then confirm the exact 22241 equivalent before you place the order. The service covers BSPP flat seat fittings, BSP hydraulic hose fittings, and BSP elbows in your inventory, and interchange confirmation is free. The cross reference sheet is returned in PDF for your records.

Packaging and Logistics

Assembly and Use Guide

Four-Step Crimping Procedure

1. Cut the hose square: use a hose cutter, never a hacksaw or an angle grinder. A square, clean end is the precondition for a uniform ferrule grip.
2. Mark the insert depth: read the insert depth for your hose series from the crimp data sheet and mark the line on the hose cover.
3. Lubricate and insert: apply a thin film of assembly lubricant to the stem and the hose bore, then push the fitting into the hose until the mark meets the ferrule.
4. Crimp and verify: select the die per the crimp table, crimp in one continuous stroke, then measure the crimp outside diameter with a caliper and compare with the tolerance.

Connecting the Flat Seat End

Check the flat sealing face for nicks or scratches before assembly; a damaged face will leak even with a new seal element. Fit the correct bonded washer or O-ring onto the mating male stud, thread the stud into the BSPP female end by hand until the seal element touches the flat face, then tighten to the torque listed for the thread size. Replace the seal element at every disassembly; bonded washers and O-rings are single-use in a rated joint.

Installation Warnings

• ❌ Never mix fittings and ferrules from different suppliers, even when the thread and hose sizes look identical. Stem geometry, ferrule hardness, and crimp parameters differ, and a mixed joint will leak or blow off under pressure.
• ❌ Never confuse a flat seat female end with a 60° cone seat end or a BSPT taper thread. Each sealing family needs its matching male stud and seal element, and the three are not interchangeable.
• ❌ Never reuse a bonded washer or O-ring. The seal element is part of the rated joint and must be replaced at every assembly.
• ❌ Never assemble on a scratched or nicked flat face. The face is the sealing surface; repair or replace the fitting if it is damaged.
• ❌ Never crimp without the matching crimp data sheet, and never recrimp a fitting after a failed attempt.
• ✔ After assembly, pressure-test the circuit at 1.5x working pressure and inspect all joints for weepage.

OEM Customization and Quality Traceability

Customization Options

• Size and thread customization: non-standard G thread and hose combinations and special bend angles machined to your drawing.
• Surface treatment customization: trivalent zinc (96 h), zinc-nickel (720 h), or Dacromet (1000 h) salt spray grades, selected by your environment and corrosion specification.
• Laser marking: your logo, part number, and batch code laser-marked on the hex for full field traceability.
• Material options: 304/316L stainless for chemical, marine, and food-contact circuits, with passivation certificates.

Quality and Traceability System

Every batch follows a documented flow: incoming steel with mill certificate → cold forging → CNC machining → heat treatment → plating → 100% thread gauge and dimension inspection → pressure test → laser marking → packing. The batch number on the carton links back to the raw material lot, the heat-treatment record, and the inspection report. Material test reports (MTR) are provided with every order on request, and third-party inspection reports (BV/SGS) can be arranged before shipment.

FAQ

Q: What is a BSP female flat seat 45° elbow? A: It is a one-piece crimp elbow for braided hose with a BSPP female port end (G series, parallel thread) that seals on a flat face, per the British flat-seat practice of BS 5200, with a 45° body angle for routing.

Q: How does the flat seat seal? A: The G thread is parallel and does not seal by itself. A bonded washer or O-ring carried by the mating male stud is compressed against the flat face of this female end when the joint is tightened. Replace the seal element at every assembly.

Q: What is the difference between flat seat, 60° cone seat, and BSPT? A: A flat seat seals by compressing an elastomer element against a flat face. A 60° cone seat seals metal-to-metal between two cone faces. BSPT (R) is a taper thread that seals by thread interference. The three systems are not interchangeable.

Q: What hose does the 22241 series fit? A: The series is designed for braided hose in sizes -04 to -20 (DN 6 to 32). For spiral hose, order the 22242 series. Confirm your exact hose construction with our engineers, and the matching crimp data sheet will be supplied with the order.

Q: Do I need to supply the bonded washer or O-ring? A: The seal element normally travels with the male stud you are connecting to, so check your mating part. If you need a matched seal element set for your order, tell our engineers and we will include the correct washers or O-rings with the shipment.

Q: Can you provide crimp data for my hose? A: Yes. Every order includes the crimp data sheet for your hose construction, with insert depth, crimp outside diameter, and die selection. Send us your hose series and brand, and our engineers will confirm the crimp parameters before shipment.

Request a Quote

Tell us the BSPP thread, the hose dash size, the hose construction, and the annual quantity. Whether you need stock BSP hydraulic hose fittings for distribution or a custom flat seat elbow for an OEM program, the quoting process is the same. For replacement orders, send the legacy part number and a photo, and our engineers will confirm the interchange before quoting. Every elbow leaves the HENGHUA factory pressure-tested, batch-coded, and backed by a written warranty. Request your quote, crimp data sheet, or drawing pack today, and we will respond within 24 hours.