OEM manufacturer ASME B16.5 · ASME B1.20.1 · EN 1092-1 Type 13
Threaded Flanges — ASME B16.5, NPT to ASME B1.20.1
A threaded flange is a hubbed flange with a taper pipe thread in the bore, screwed onto a threaded pipe without welding. Teshi Group manufactures threaded flanges to ASME B16.5 with NPT threads to ASME B1.20.1, and to EN 1092-1 Type 13, in carbon and stainless steels.
Also called: screwed flange, NPT flange, THD flange, TRF flange
What is a Threaded Flange?
A threaded (screwed) flange has a female taper thread machined in its bore and screws onto an externally threaded pipe. Because no welding is needed, it is used where hot work is not allowed, such as in explosive areas, or where galvanized pipe would be damaged by welding. The threaded joint can leak under thermal cycling, vibration or bending, so threaded flanges are generally limited to small sizes, modest temperatures and non-cyclic utility services. A seal weld is sometimes added where the piping class permits.
Key features
- Taper pipe thread (NPT per ASME B1.20.1) in the hub; BSPT on request
- No welding needed for installation
- Suits galvanized pipe and hot-work-restricted areas
- Raised or flat face
- Threads gauged with ring and plug gauges
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | ASME B16.5; EN 1092-1 Type 13 |
| Thread | NPT to ASME B1.20.1; BSPT to ISO 7-1 / EN 10226-1 on request |
| Pressure class | Class 150–2500 per B16.5 tables (higher classes in smaller sizes only) |
| Facing | RF, FF |
| Materials — carbon steel | ASTM A105 / A105N; ASTM A181 Cl 60, Cl 70; ASTM A266 Gr 2, Gr 4 (large forgings) |
| Materials — high-yield carbon steel | ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 (MSS SP-44 grades F52–F70) |
| Materials — low-temperature carbon steel | ASTM A350 LF1, LF2 Cl 1, LF2 Cl 2, LF3, LF6, LF9 |
| Materials — alloy steel (Cr-Mo) | ASTM A182 F1, F2, F5, F5a, F9, F11 Cl 1 / 2 / 3, F12 Cl 1 / 2, F21, F22 Cl 1 / 3, F22V, F91, F92, F911; ASTM A336 F11, F22 (large forgings) |
| Materials — stainless steel | ASTM A182 F304, F304L, F304H, F304LN, F309H, F310, F316, F316L, F316H, F316LN, F316Ti, F317, F317L, F321, F321H, F347, F347H, F348 |
| Materials — 904L and 6Mo | 904L (ASTM A182 F904L, UNS N08904); 254 SMO / 6Mo (ASTM A182 F44, UNS S31254); AL-6XN (ASTM A182 F62, UNS N08367) |
| Materials — duplex stainless steel | ASTM A182 F51 (UNS S31803), F60 (UNS S32205, 2205) |
| Materials — super duplex stainless steel | ASTM A182 F53 (UNS S32750, 2507), F55 (UNS S32760), F61 (UNS S32550) |
| Materials — nickel alloys | ASTM B564 / B160 / B462: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Monel K-500 (N05500), Inconel 600 (N06600), Inconel 625 (N06625), Inconel 718 (N07718), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B381 Grade F1, F2, F5 (Ti-6Al-4V), F7, F12 |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), ASTM B151 bar; flanges to ASME B16.5 or EEMUA 145 |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Testing | Visual and dimensional inspection, PMI on alloy and stainless grades, hardness; UT, MPI/DPI as specified; thread gauging |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification when specified |
Applications
- Fire water and sprinkler lines
- Galvanized utility water and air piping
- Instrument air and small-bore utility lines
- Areas where hot work is not permitted
- Low-pressure fuel gas and LPG distribution (where code permits)
Technical data sheets
Dimensions & weights
FAQ
Threaded Flange: common questions
What thread is used on ASME threaded flanges?
ASME B16.5 threaded flanges have American National Standard taper pipe threads (NPT) to ASME B1.20.1. BSPT threads can be machined on request for systems built to ISO 7-1.
Can threaded flanges be seal welded?
Yes, where the piping specification allows. A seal weld at the hub improves leak-tightness, but it removes the main advantage of no welding and must be done without damaging the face.
Are threaded flanges suitable for high temperature?
Generally not. Threads can loosen and leak under thermal cycling and bending, so piping codes and most owner specifications restrict threaded joints to small sizes and non-cyclic, moderate-temperature services.
Do you supply galvanized threaded flanges?
Yes. Carbon steel A105 threaded flanges can be hot-dip galvanized after machining, with threads re-tapped or protected as specified for fire water and utility piping.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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