Threaded Flange

A high-integrity, no-weld piping solution designed for high-pressure systems and hazardous environments. Precision-machined NPT/BSPT threads ensure a leak-proof seal without post-weld heat treatment.

Standard: ASME B16.5, ANSI, DIN, EN 1092-1
Size: 1/2″ – 24″ (DN15 – DN600)
Pressure: Class 150, 300, 600, 1500, 2500 (PN6 – PN40)
Materials: Carbon Steel A105, Stainless Steel 304/L, 316/L, Alloy Steel
Thread Type: Tapered NPT (ANSI/ASME B1.20.1) or BSPT

PMI TESTEDEN 10204 3.1 MTRISO CE CERTIFIED

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Threaded Flanges (Screwed Flanges) – ASME B16.5 Standard

Professional-grade NPT and BSPT threaded flanges for high-pressure piping systems where welding is not preferred or restricted.

What is threaded flanges?

A Threaded Flange (also known as a Screwed Flange) is a specialized piping component containing a tapered thread inside its bore. It is matched with pipes that have external threads. The primary advantage of threaded flanges is that they can be attached to the pipe without welding, making them ideal for extremely high-pressure services or applications in highly volatile areas where post-weld heat treatment is not feasible.

At JS FITTINGS, we manufacture threaded flanges that strictly adhere to ASME B16.5, DIN, and EN standards, ensuring perfect sealing and structural integrity in oil, gas, and water treatment infrastructures.

Technical Specifications

Feature	Specifications & Details
Standards	ASME B16.5, ANSI B16.5, DIN 2565/2566, EN 1092-1, JIS B2220
Size Range	1/2″ to 24″ (DN15 to DN600)
Pressure Ratings	Class 150, 300, 600, 900, 1500, 2500 \| PN6, PN10, PN16, PN25, PN40
Thread Types	NPT (National Pipe Thread), BSPT (British Standard Pipe Taper)
Material Grades	Carbon steel: ASTM A105, A350 LF2; Stainless steel: F304/304L, F316/316L; Alloy steel: F11, F22
Facing Types	Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Threaded Flange Dimensions (Class 150 – ASME B16.5)

Nominal Size (NPS)	Outside Diameter (D)	Thickness (C)	Bolt Circle (W)	No. of Holes
1/2″	90 mm	11.5 mm	60.5 mm	4
1″	110 mm	14.5 mm	79.5 mm	4
2″	150 mm	19.5 mm	120.5 mm	4
4″	230 mm	24.5 mm	190.5 mm	8

*Dimensions for larger sizes and different pressure classes (Class 300-2500) available in our full technical catalog.

Key Advantages

No welding required (Safe for explosive environments).
Ease of installation and maintenance.
Reusable for temporary piping systems.
Ideal for small diameter, high-pressure pipes.

Main Applications

Chemical and Petrochemical processing.
Low pressure, non-critical services.
High-pressure utility systems (Water, Air).
Refineries and Power generation.

Reliable Threaded Flange Manufacturer

All JS FITTINGS threaded flanges undergo thread gauging and PMI testing. Mill Test Certificates (MTR) according to EN 10204 3.1 provided with every order.

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