OEM manufacturer ASME B16.11 · ASME B1.20.1
Threaded Plugs — Hex, Square & Round Head, ASME B16.11
A threaded plug screws into a female-threaded opening to close it. Teshi Group manufactures hex head, square head and round head plugs to ASME B16.11, with NPT threads to ASME B1.20.1, in carbon, low-temperature, alloy and stainless steels.
Also called: hex head plug, square head plug, round head plug, pipe plug, NPT plug
What is a Threaded Plug?
A threaded plug is a forged or bar-machined fitting with a male taper thread and a head for tightening. Hex head plugs are tightened with a spanner and are the most common; square head plugs are used where a square drive is preferred; round head plugs have no flats and are typically seal welded or used where tampering should be discouraged. Plugs close tee outlets, couplings, threadolets, valve drains and vents. ASME B16.11 covers plugs without a pressure class designation.
Key features
- Hex head, square head and round head per ASME B16.11
- NPT male thread per ASME B1.20.1, gauged
- Solid forged or bar-machined body
- Closes female-threaded outlets on fittings, valves and equipment
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | ASME B16.11 |
| Types | Hex head, square head, round head |
| Pressure class | Not class-designated in ASME B16.11 |
| Size range | NPS ⅛"–4" (DN 6–100) per ASME B16.11 |
| Threads | NPT per ASME B1.20.1; BSPT (ISO 7-1) on request |
| 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, dimensional and thread/socket gauge inspection; PMI on alloy and stainless grades; hardness check; MPI/DPT when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Closing tee, coupling and threadolet outlets
- Valve body drains and vents
- Test points and spare tappings
- Pump and equipment casing connections
FAQ
Threaded Plug: common questions
Which plug type should I choose?
Hex head plugs are the common choice because they are easy to tighten. Square head plugs suit square drives; round head plugs are used where the plug will be seal welded.
Do plugs have a pressure class?
ASME B16.11 does not assign class designations to plugs and bushings. Select the plug material to match the fitting, valve or equipment it closes, as per the piping specification.
Can plugs be supplied in the same material as the valve?
Yes. Plugs are supplied in ASTM A105, A350 LF2, A182 F11, F22, F304L, F316L and duplex grades to match the parent fitting or valve body.
How should the plug be sealed?
Use a thread sealant or PTFE tape suited to the service on NPT threads and tighten to normal make-up. For hazardous, cyclic or high-temperature service, many piping specifications require threaded joints to be seal welded.
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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