Raised face (RF)
A raised gasket surface concentrates bolt load on the gasket.
As specified
LF — 06
LF — 06
Threaded Flange
A threaded-bore flange for weld-free pipe connections and removable joint arrangements.
Key attributes
- Connection
- Threaded bore
- Joint
- Bolted flange face
- Welding
- Not required
- Supply basis
- Size, class & drawing
- Category
- Fasteners & Fittings
- Location
- Mumbai, India
- Drawing-ledSample or spec review
- Domestic & exportEnquiries welcome
- Mumbai basedMazgaon, Maharashtra
Quick answer
What is a threaded flange?
A threaded flange, also called a screwed flange, has an internally threaded bore that screws onto a threaded pipe end. It creates a bolted, removable flange joint without welding, which is useful where welding is impractical, restricted or hazardous.
Also known asScrewed flange · Threaded pipe flange · NPT / BSP flange
Key takeaways
- Joins pipe by thread instead of welding.
- Specify size, pressure class, facing and thread form.
- Best suited to smaller bores and moderate service conditions.
- Thread sealing method should be considered with the joint.
How Threaded Flanges Work in Practice
Threaded flanges allow a pipe to be connected to valves, equipment or another flanged line without hot work. They are commonly used on utility, water, air and similar services, and in areas where welding permits are difficult to obtain.
The flange dimensions, drilling and pressure class should follow the piping standard used on your project, while the bore thread must match the pipe thread exactly. Share the standard, size, class, facing, thread form and material together for an accurate review.
Common Threaded Flange Variants
Flat face (FF)
Full flat face, often used when mating with flat-faced equipment flanges.
Taper or parallel thread
Bore thread form is chosen to match the pipe thread (for example NPT or BSP).
Drilling to standard
Bolt-circle and hole pattern follow the referenced flange standard.
How to Choose the Right Threaded Flange
01
Thread Match
The bore thread must match the pipe thread form and size; mixing taper and parallel threads causes leaks.
02
Pressure & Temperature
Threaded joints suit moderate conditions; state the design pressure and temperature for review.
03
Material Compatibility
Flange material should match the pipe and process fluid to avoid corrosion at the joint.
04
Mating Standard
Drilling and facing must match the mating flange — reference the standard on your drawing.
Threaded Flange vs Weld-Neck Flange
Both create a bolted flange joint; the method of attaching the flange to the pipe differs.
| Criteria | Threaded flange | Weld-neck flange |
|---|---|---|
| Pipe attachment | Screwed onto threaded pipe | Butt-welded to the pipe |
| Welding required | No | Yes |
| Typical service | Moderate pressure, smaller bores | Higher pressure, temperature or cyclic service |
| Installation | Fast, no hot work | Requires qualified welding and inspection |
| Leak path | Thread must be sealed | Welded joint, no thread |
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