What is the difference between NPT and BSPT threads?

NPT (National Pipe Thread) is the US standard with a 60-degree thread angle and flattened peaks/valleys. BSPT (British Standard Pipe Thread) also has a 55-degree angle but uses rounded peaks/valleys. NPT and BSPT are NOT interchangeable and will leak if mated. Always match thread types when ordering fittings.

What pressure ratings are available for threaded fittings?

Threaded fittings are available in Class 3000#, 6000#, and 9000# per ASME B16.11. The 3000# rating is for standard duty, 6000# for high pressure, and 9000# for ultra-high pressure applications up to 10000 PSI depending on size and temperature.

What materials are available for threaded fittings?

Stainless Steel: F304, F304L, F316, F316L, F321, F347. Carbon Steel: ASTM A105 (most common for high pressure). Alloy steel options available on request. SS316L and F304L are low-carbon variants recommended for焊接 applications to avoid sensitization.

What is the difference between a hex nipple and a barrel nipple?

A hex nipple has a hexagonal section in the middle for wrench grip, making it easier to tighten. A barrel nipple (also called a running nipple) has no hex section - it's a plain pipe extension with threads on both ends. Hex nipples are more common for general applications; barrel nipples are used when a smooth appearance is needed.

What is a street elbow?

A street elbow is an elbow fitting with male threads on one end and female threads on the other. This allows direct connection without a coupling or adapter. Street elbows are useful when connecting a male pipe to a female fitting at an angle (typically 90° or 45°).

What is the difference between full coupling and half coupling?

A full coupling (also called a coupling) has female threads on both ends and joins two male pipes in a straight line. A half coupling has female threads on one end and a socket weld end on the other - used for valve takeoff or instrument connections where you need to branch off a main pipe.

What standards govern threaded and socket weld fittings?

ASME B16.11 covers forged steel fittings (elbows, tees, caps, etc.) for high-pressure applications. ASME B16.3 covers malleable iron threaded fittings for low-pressure applications. ASME B16.15 covers cast brass threaded fittings. ASTM A182 is the material specification for forged stainless and alloy steel fittings.

Supreme Valves Brand

Threaded & Socket Weld Fittings – Elbow, Tee, Union, Coupling, Nipple, Cap, Plug

Name: Threaded & Socket Weld Fittings - Supreme Valves
Brand: Supreme Valves
SKU: SV-YAK-FITTINGS
Rating: 4.7 (89 reviews)

Supreme Valves threaded and socket weld fittings for industrial applications. Sizes from 1/8" to 4" with pressure ratings up to 10000 PSI. Available in SS304, SS316, SS304L, SS316L, A105 carbon steel. Thread types: NPT and BSPT. Manufactured per ASME B16.11, B16.3, B16.15 and ASTM A182 standards. Complete range of elbows, tees, crosses, reducers, unions, couplings, hex nipples, barrel nipples, caps, plugs, bushings, and street elbows.

Quick Summary

Threaded & Socket Weld Fittings = Forged fittings (Supreme Valves) for piping connections. Elbow, Tee, Cross, Reducer, Union, Coupling, Hex Nipple, Barrel Nipple, Cap, Plug, Bushing, Street Elbow. Sizes 1/8 to 4 inch. Class 3000#, 6000#, 9000#. NPT and BSPT threads. SS304/316 and Carbon Steel A105. Used in oil & gas, chemical, petrochemical, instrumentation, hydraulic systems.

Threaded and Socket Weld Fittings - Elbow, Tee, Union, Coupling, Nipple

In Stock Up to 10000 PSI ASME B16.11

Key Specifications

Size: 1/8 to 4 inch

Thread: NPT / BSPT

Pressure: 3000# / 6000# / 9000#

Standard: ASME B16.11

Materials: SS304/304L/316/316L

Carbon Steel: ASTM A105

Testing: Hydrostatic

Brand: Supreme Valves

Request Enquiry WhatsApp Download Datasheet

Product Types

Threaded Fittings (NPT / BSPT)

Full-forged construction per ASME B16.11. Male and female threads for easy assembly with standard pipe wrenches.

Elbow 90°

1/8" to 4" sizes.改变管道方向90度。

Elbow 45°

1/8" to 4" sizes.改变管道方向45度。

Tee

1/8" to 4" sizes.三通分支连接。

Cross

1/8" to 4" sizes.四通连接。

Reducer

1/4" to 4" sizes.变径连接。

Union

Metallic or PTFE seat.可拆卸连接。

Coupling Full

Straight through.等径连接。

Half Coupling

Threaded one side, socket weld other.阀门取压口用。

Hex Nipple

Hex section for wrench grip. Both ends male.

Barrel Nipple

No hex, plain pipe extension.平滑延伸。

Cap

Blind end thread.管道封堵。

Plug

Male thread. Closes fittings.内螺纹堵头。

Bushing

Reduces thread size.变径衬套。

Street Elbow

Male one side, female other.90度方向转换。

Socket Weld Fittings

Butt weld socket connection per ASME B16.11. Provides strong, leak-proof joint for high-pressure applications.

Elbow 90°

Socket weld ends. 1/4" to 4".

Elbow 45°

Socket weld ends. 1/4" to 4".

Tee

Socket weld ends. 1/4" to 4".

Cross

Socket weld ends. 1/4" to 4".

Coupling Full

Socket weld both ends.

Half Coupling

One socket weld, one threaded.

Reducer

Socket weld ends.

Cap

Socket weld blind end.

Insert

Socket weld reducer insert.

Materials of Construction (MOC)

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Technical Specifications

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25