Threaded Flange (Screwed Flange / TH Flange)
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
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A forged pipe flange featuring an internal tapered pipe thread (NPT or BSPT) machined into its bore, enabling connection to external-threaded pipe without welding.
Technical Explanation & Metallurgical Principles
Threaded flanges are ideal for low-pressure utilities and volatile environments (like operating fuel depots or flammable gas areas) where open flame welding is hazardous. The internal thread conforms to ASME B1.20.1 NPT or ISO 7-1.
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Thread Standard | ASME B1.20.1 NPT tapered pipe threads |
| Welding Required | None (weld-free assembly) |
| Size Scope | NPS 1/2" to 4" (DN 15 to DN 100) |
Application at Jayesh Forge (Rajkot Plant)
Forged and CNC-threaded in Rajkot in carbon and stainless steel strictly up to 50 kg for flammable oil depot manifolds.
Related Materials, Standards & Products
Related Metallurgical & Testing Terms
ASME B16.5 Pipe Flanges Standard
The definitive American standard covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges NPS 1/2 through NPS 24.
Weld Neck Flange (WN Flange)
The premier high-integrity forged flange configuration featuring a long, tapered circular hub that butt-welds seamlessly to process pipe.
Slip-On Flange (SO Flange)
A forged pipe flange designed to slide over the outer diameter of process pipe and be secured using two fillet welds (one internal and one external).
Questions Regarding Threaded Flange (Screwed Flange / TH Flange)
No, threaded joints are vulnerable to thread leakage under cyclic bending and vibration; weld neck flanges are preferred for cyclic high pressure.
Request a Forging Quote with Threaded Flange (Screwed Flange / TH Flange) Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.