KuitunThreaded flange

Threaded flanges (threaded flanges, Th flanges) feature female NPT threads in their bore. Simply screw the pipe into the flange, install a gasket, and tighten with bolts to achieve a leak-tight seal—no welding or hot work is required, making them particularly suitable for small-diameter piping or hazardous plant areas. As this connection method is mechanical, threaded flanges are the preferred choice for explosive atmospheres, cryogenic discharge lines, and any application where sparks could lead to severe consequences.

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Kuitunflange

Phone: 400-888-8888

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Product Description

Threaded flange—simply screw it on; no welding required.

Threaded flanges (threaded flanges, Th flanges) feature internal NPT threads within the bore. Simply screw the pipe into the flange, install a gasket, and tighten the bolts to achieve a secure seal—no welding or hot work is required, making them particularly well suited for small-diameter piping or hazardous plant areas. As this connection method is mechanical in nature, threaded flanges are the preferred choice for explosive atmospheres, cryogenic discharge lines, and any application where sparks could have severe consequences.

Our available standard specifications ：

Project	Typical range
Nominal size	½ inch – 4 inches (DN 15 – DN 100)
Pressure rating	150–2,500 pounds (PN 10–PN 400)
Thread form	NPT (ANSI B1.20.1), BSPP, and BSPT threads are available upon request.
Sealing surface	RF, FF, RTJ
Materials	A105, LF2, F304, F316L, F51 duplex stainless steel, and others.

Why do operators choose threaded flanges?

Welding-free—eliminating ignition sources in hazardous (explosion-proof) areas

Quick installation—screw-fastened, with no post-weld heat treatment or NDT delays required.

Specialized manufacturer of small-bore fittings—forged in a single step, ranging from ½-inch NPT to 4-inch NPS.

Same specification—2,500 pounds, applicable to DN 50 and smaller sizes.

Reusable—unscrew for inspection and reseal with new tape.

Typical Services

Lubricant Control Console in Explosion-Proof Grade Buildings

Instrument air header at near-atmospheric pressure

Low-temperature discharge pipeline (-196°C, 304L short section)

Sampling points that require frequent sampling

High-purity gas panel (electrolytically polished internal bore, Ra ≤ 0.4 µm)

Quick Selection Guide

Service	Pressure rating	Materials	Sealing surface
Instrument air	150	A105	RF
Low-temperature exhaust port	300	F304L	FF
Sulfuric acid	150	F316L	RF
Hydrogen circulation	600	F51	RTJ