Threaded Flanges – ASME/ANSI B16.5

VikTech Fittings is a trusted manufacturer, exporter, and supplier of Threaded Flanges, available in Carbon Steel, Stainless Steel, Alloy Steel, Duplex & Special Alloys. Threaded Flanges are designed with internal threads that allow quick and easy connection to a pipe without the need for welding. This makes them highly suitable for low-pressure, non-critical applications and environments where welding is not possible.

What is a Threaded Flange?

A Threaded Flange (also called a Screwed Flange) is manufactured with a tapered female thread inside the flange bore. The pipe with matching male threads is screwed into the flange, forming a tight joint. Threaded flanges are commonly used in low-pressure pipelines, flammable areas, and explosive zones where welding could be hazardous.

Types of Threaded Flanges

• Raised Face Threaded Flange (RF)

• Flat Face Threaded Flange (FF)

• Threaded Flange with Hub

• Threaded Flange without Hub

• Special Custom Threaded Flanges

Materials & Grades

✅ Carbon Steel Threaded Flanges

• ASTM A105 / A105N

• ASTM A350 LF2 (Low Temperature CS)

• ASTM A694 F42 – F70

✅ Stainless Steel Threaded Flanges

• ASTM A182 F304 / 304L

• ASTM A182 F316 / 316L

• ASTM A182 F321 / F347

✅ Duplex & Super Duplex Steel Threaded Flanges

• UNS S31803 / S32205

• UNS S32750 / S32760

✅ Alloy Steel Threaded Flanges

• ASTM A182 F1, F5, F9, F11, F22, F91

✅ Nickel Alloys & Special Grades

• Inconel 600 / 625 / 800 / 825

• Monel 400 / K500

• Hastelloy C22 / C276

• Alloy 20

• Copper Nickel (Cu-Ni) 70/30, 90/10

• Titanium Gr.2 / Gr.5

Advantages of Threaded Flanges

• No welding required – quick & easy installation

• Suitable for small diameter pipelines

• Can be reused after dismantling

• Safe in flammable & explosive environments

• Low maintenance connection method

Applications of Threaded Flanges

• Oil & Gas pipelines (low pressure)

• Flammable fuel & chemical lines

• Firefighting systems

• Marine & offshore applications

• Water treatment & plumbing lines

• Hazardous / explosive areas where welding is restricted

Technical Specifications

Specification ItemDetailsStandardASME/ANSI B16.5, B16.47, DIN, EN 1092-1, JIS B2220, BS 4504Size Range½” (DN15) to 24” (DN600)Pressure RatingClass 150, 300, 600, 900, 1500Facing TypesRaised Face (RF), Flat Face (FF)Thread TypesNPT (National Pipe Thread), BSP, BSPTTestingPMI, UT, Hydro Test, NDT, NACE MR0175, Third-Party InspectionCertificationEN 10204 3.1 / 3.2, ISO, CE