Thread Flange

QS Flange: Putian Thread Flange

Thread flange per ASME, ANSI B16.5 and EN1092-1, 1/2 to 6 inch, 150LB to 600LB, FF/RF, in carbon, stainless, alloy and duplex steel for weld-free pipe connections.

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One-Minute Overview

Threaded bore flange that screws onto a matching pipe thread — no welding needed.
Sizes 1/2 to 6 inch, pressure ratings 150LB to 600LB, FF or RF faces.
Carbon, stainless, alloy and duplex steel for corrosive, hot or general service.
Common in oil and gas, water treatment, chemical plants, HVAC and food lines.

A thread flange joins pipe through its threaded bore instead of a weld, so the joint goes together with a wrench. The series covers 1/2 to 6 inch and 150LB to 600LB, in FF or RF faces and carbon, stainless, alloy or duplex steel, built to ASME, ANSI B16.5 and EN1092-1.

Name: Thread Flange
Size: 1/2"-6"
Pressure: 150LB - 600LB
Flange Face: FF/RF
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
Standard: ASME, ANSI B16.5, EN1092-1

Installation is straightforward: the pipe is threaded into the flange bore, a gasket is placed between the flange and the adjacent component, and the joint is secured with bolts or studs. That weld-free design helps where hot work is not allowed or where the joint will be opened often. Specify the pressure rating and temperature range first, then the material and finish to suit the media — stainless steel for corrosive or hygiene-critical service, alloy steel for extreme temperature and pressure, carbon steel for general duty, duplex where corrosion resistance and strength both matter. Thread flanges are widely used in high-pressure oil and gas lines, water treatment plants, chemical processing, HVAC ductwork and food and beverage piping.

FAQ

Q1. Which standards and ratings does this thread flange follow?

The range is dimensioned to ASME, ANSI B16.5 and EN1092-1, covering 1/2 to 6 inch and 150LB to 600LB with FF or RF faces. Choosing by pressure rating and temperature range first keeps the joint inside its design limits, whatever material the service ends up requiring.

Q2. Do I really get away without welding it?

Yes — that is the whole point of a threaded bore. The pipe screws into the flange, a gasket goes between the flange and the next component, and bolts or studs hold it all together. It also makes future disassembly far painless than cutting out a weld, which crews notice on lines that open every turnaround.

Q3. Stainless, carbon, alloy, duplex — which one stops me overthinking at 2 a.m.?

Match the media and the temperature. Carbon steel handles general duty, stainless steel shrugs off corrosive or hygiene-critical service and cleans up easily, alloy steel takes extreme temperature and pressure, and duplex covers where strength and corrosion resistance both matter. Fix the finish to the environment and the worry goes away.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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