90 Degree Elbow Metric Male 74 Degree Cone to BSPT Male Adapter 1QT9-SP (74° Cone / BSPT Sealing Thread)

Why This 90 Degree Elbow Metric Male 74 Degree Cone to BSPT Male Adapter 1QT9-SP Passes the Compliance Gate

The 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP joins two different sealing systems in one forged body: a metric male 74 degree cone end (the 74 degree included cone, that is the 37 degree flare seat geometry of SAE J514 applied to a metric thread) and a male taper pipe thread end machined to the 55 degree sealing pipe thread family of ISO 7-1 / GB/T 7306 (identical thread form to EN 10226-1, historically written R1/4″, R1/2″, R1″ and so on).

That is what makes it a maintenance item rather than a catalogue curiosity: European and Japanese machine blocks, cylinder heads, valve banks and test manifolds often carry a metric flared port, while the pipework, gauge stems or lubrication lines feeding them are British taper thread. One 1QT9-SP replaces a straight metric 74 degree cone adapter stacked with a separate BSPT hex nipple, removing one threaded joint, one wrench pass and one place where oil can weep.

The elbow is a single forged and machined body, with no welded joint, brazed insert or pressed-in stem to fail under vibration. Every row in the table below is reproduced from the series dimension drawing, so the size can be checked before a purchase order is raised.

Sizes run from M14X1.5 x R1/4″X19 to M45X2 x R1.1/4″X11, covering metric flared ports for tube outer diameters of 8 mm to 34 mm.

Core Advantages

1. Cross-standard integration in one part. Converts a metric 74 degree cone port to a BSPT male thread, so mixed-standard machines can be piped without adapter stacks.
2. Compact 90 degree routing. The bend is forged into the body, saving the space a straight adapter plus a swept hose end would consume near a bulkhead or a cylinder cap.
3. Twelve closed sizes. A complete matrix from M14X1.5 to M45X2, each with fixed A, B, S1 and S2 dimensions so tooling, hose routing and wrench access can be planned from the table.
4. Optional RN tube kit. Order with suffix /RN and the fitting ships with the flared tube sleeve NB500-Q and nut NB200-Q, turning the outlet into a complete flared tube connection.
5. Traceable, test-documented production. Batch numbers, material certificates on request and 100% pressure testing of the finished assembly are part of the standard Globhose/HENGHUA hydraulic fitting offer.
6. OEM marking available. Laser part marking, customer logo and private labelling are offered for OEM programmes.

Technical Specifications

What Is a 90 Degree Elbow Metric Male 74 Degree Cone to BSPT Male Adapter?

It is a one-piece 90 degree elbow with a 74 degree external cone (37 degree flare seat) male end on one leg and a male BSPT taper thread end on the other leg. The metric side seals metal-to-metal on a matching 74 degree internal cone seat; the BSPT side seals on the thread itself, so it needs a thread sealant or a soft-sealing washer arrangement depending on the mating port.

Two families are often confused with this part and neither is interchangeable with it:

Connection 1 (Metric Male 74 Degree Cone End)

Connection 2 (BSPT Male End)

Dimensional Data

D symbols in this series: D8, D10, D12, D14, D18, D20, D22, D25, D28, D34.

Full Dimension Table (Part Number Matrix)

All dimensions are in millimetres. A and B are measured from the elbow centreline to the end face of each port; S1 and S2 are the wrench flats exactly as marked in the supplier dimension drawing. Thread callouts are reproduced verbatim, with the standardised reading of R1/4″X19 as a 1/4″ nominal taper pipe thread of 19 threads per inch where the notation follows that convention.

Thread Size and Dash Chart

The dash pairs are read as metric size then pipe size: 04 = R1/4″, 06 = R3/8″, 08 = R1/2″, 12 = R3/4″, 16 = R1″, 20 = R1.1/4″.

Material and Heat Treatment

The dimension drawing for this series does not state a material grade or a heat treatment, so the values below describe typical production and remain subject to confirmation on the purchase order or drawing.

Working Pressure and Operating Envelope

The drawing above carries no pressure column, so no pressure rating is claimed for this series. The working pressure of a finished connection made with this 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP is governed by the port standard together with the hose or tube grade selected, and the finished assembly is only as strong as its weakest member.

Factory practice for this family:

• Pressure data sheets referenced to the relevant connection standards (SAE J514 for the 74 degree cone geometry, ISO 7-1 / GB/T 7306 for the taper thread) can be supplied on request.
• Each production batch is pressure tested as part of the standard HENGHUA fitting workflow; batch records support the test.
• For safety-critical circuits, size the assembly from the lowest rated element: the tube, the flared joint, the sleeve, the port or the fitting body.
• Do not select a size on the assumption that a larger hex implies a higher rating; hex size is a wrench consideration, not a pressure grade.

Temperature Range

A typical service window for a steel fitting of this design with a nitrile or flared metal joint is -40 degrees C to +120 degrees C. The real limit of an assembly is set by the seal and by the connected hose or tube, not by the fitting body alone. Outside that window, specify the seal and hose compound together and confirm the combination with our engineering desk.

How to Read the Part Number Matrix

This is how the ordering code of the 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP is built: series prefix, size pair, and variant suffix.

• Prefix 1QT9 identifies the product family: a 90 degree elbow (9 at the end of the elbow block) with a metric male 74 degree cone end (1Q) and a male taper pipe thread end (T). A straight version of the same combination would be written 1QT.
• Suffix SP marks the taper sealing pipe thread end. Parts in this family without the SP suffix do not carry the BSPT end.
• Size block -mm-pp gives the metric thread size and the pipe size. The first pair is the metric cone size in whole millimetres, the second pair is the pipe size in eighths of an inch.

Three worked examples:

If your drawing or your worn sample carries a different prefix from another supplier, send us the sample photo with the thread measured and we will map it to the correct row of this matrix.

Selection and Ordering

Selection Checklist / Decision Table

Cross Reference Service

Send a photograph of the old fitting with three measurements: thread outside diameter, pitch gauge result on the metric end, and the pipe end thread callout. We will identify the correct row free of charge, normally within 24 hours. We do not copy or re-label another company’s brand, and a customer’s own stock number is marked only when authorised in writing.

Packaging and Logistics

Installation and Fitment Guide

Step-by-Step Assembly

1. Identify both ports. Confirm the block port is a metric 74 degree cone seat and the receiving pipework is a BSPT (R) female port; a pitch gauge check prevents the most common mistake in this family.
2. Inspect and clean. Reject nicks, burrs, plating build-up or swarf on the cone and the mating seat, then flush the pipework and wipe the cone with a lint-free cloth. A damaged cone cannot be recovered by extra torque.
3. Fit the taper thread end first. Apply a sealant compatible with the system fluid to the BSPT male thread, start it by hand, and run it in until it seats with light wrench force.
4. Tighten the metric cone end. Hold the body on the marked flats and tighten the swivel nut or mating female port to the torque value for that thread size.
5. Leak test at working pressure. Check both ends and re-torque the taper thread only, never by swinging on the hose.

Torque and Sealing Notes

• Use the torque figure published for the thread size in use: torque is set by thread size and material, not by the perception of tightness.
• The 74 degree cone seals on metal-to-metal contact, so cone and seat must be clean, concentric and free of plating damage. No sealant is used on the cone.
• The taper thread needs a sealant or sealing washer arrangement, assembled to an engagement depth that produces a dry joint, not to the point of thread deformation.
• Use two wrenches, one on the body flats and one on the union nut, and renew the sleeve and nut whenever a tube end has been re-flared.

Installation Warnings

• ✔ Confirm both halves are 74 degree cone before assembly.
• ✔ Check S1 and S2 against the wrenches you intend to use.
• ✔ Use a sealant chemically compatible with the system fluid.
• ✔ Support the pipework so the fitting carries no bending load, and re-test at working pressure after any re-torque.
• ❌ Never force a 74 degree cone into a 24 degree or 60 degree seat; the threads may engage but the joint will not seal.
• ❌ Never substitute a BSPP (G) fitting for the BSPT end; a parallel thread will not seal in a taper port.
• ❌ Never exceed the torque table value to stop a leak; the flare or the threads will be damaged.
• ❌ Never reuse a plastically deformed cone or a stretched union nut, or mix parts from a different cone system.

Applications and Industries

Mixed-standard machines are the daily reality in plant engineering, which is where the 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP earns its place on the shelf.

Industry tags: hydraulic power units, test benches, offshore and marine, oil and gas, construction machinery, mining, agriculture, industrial plant maintenance, tube and hose fabrication shops.

OEM Customization and Quality Traceability

HENGHUA supplies hydraulic adapters and complete hose assemblies as a complement to its Globhose hose programme, so this fitting can be bought on its own or made up into a tested assembly.

• Private labelling and laser marking. Customer logo, part number and date/lot codes marked to drawing.
• Custom surface treatment. Trivalent zinc, Zn-Ni, and alternative coatings to specification.
• Drawing-based production. Send a drawing or a sample; typical quotation turnaround is 24 hours.
• Batch traceability. Heat number, production batch and inspection record tied to each carton.
• Testing. 100% pressure testing of assemblies; pulse and burst curves available for hose programmes.
• Third-party inspection. BV or SGS inspection can be arranged at the customer’s request.
• Samples. Custom samples in 48 hours for standard configurations.

FAQ

Q: Is the metric 74 degree cone the same as a JIC 37 degree flare? A: The sealing geometry belongs to the same family: the 74 degree cone is the included angle, equal to a 37 degree half angle, the flare seat defined for steel tube fittings in SAE J514. In this series the cone end carries a metric parallel thread such as M22X1.5, not a UNF thread.

Q: Can I screw this elbow into a BSPP port? A: No. A BSPT male end is tapered and seals on the thread turns, while a BSPP (G) port is parallel and expects a face or bonded seal. The thread may start, but the joint will not seal reliably and the port can be damaged.

Q: What pressure is the fitting rated for? A: The dimension drawing for this series carries no pressure column, so no pressure rating is claimed. Working pressure is governed by the port standard together with the hose or tube grade selected, and the finished assembly is only as strong as its weakest member. A data sheet referenced to the applicable standards can be provided on request.

Q: What material is the elbow made from? A: Typical production is a forged carbon steel body with trivalent zinc plating. Stainless steel 304 or 316L and coatings such as Zn-Ni are available on request. Confirm the grade on the purchase order, because the drawing does not state a material.

Q: Do I need a sealant, and how do I connect a flared tube? A: Sealant is needed on the taper thread only; the 74 degree cone seals metal-to-metal on its seat. For a bare flared tube, order the /RN suffix, for example 1QT9-22-08SP/RN, to receive the NB500-Q sleeve and NB200-Q nut as a set.

Q: How do I order the 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP, and what lead time applies? A: Send the metric thread size, the BSPT size, the tube outer diameter, the material or coating and the quantity; quotations are normally answered within 24 hours. Standard sizes ship as 7 day batch deliveries, custom samples in 48 hours, and mixed sizes can be consolidated in one shipment.

Solicitar um orçamento

Tell us the port on the machine and the thread on the pipework, and we will confirm the correct row of the 90 degree elbow metric male 74 degree cone to BSPT male adapter 1QT9-SP matrix the same working day where possible. To quote accurately we need five things: the metric thread size on the cone end, the BSPT size on the other end, the tube outer diameter you intend to use, the material or surface treatment required, and the quantity with the delivery date you are working to. Send those five details with any drawing or sample photo and expect a quotation within 24 hours; add the /RN suffix in your enquiry if you also need the NB500-Q sleeve and NB200-Q nut as a complete flared tube set.

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