Comprehensive Range of Threaded Bushings & Plugs – Conforming to ASME B16.11 – NPT & BSP Threads – Available in Carbon Steel A105, Stainless Steel F304/F316, Alloy Steel F11/F22, Duplex, and Nickel Alloys like Monel, Inconel & Hastelloy.
Threaded bushings and plugs are vital components used in piping systems to control and direct the flow of fluids, while also providing secure sealing solutions. A threaded bushing is designed to connect pipes or fittings of different sizes by reducing the pipe diameter through its threaded interior and exterior. On the other hand, a threaded plug is used to close the end of a pipe or fitting, effectively sealing off the flow and preventing leakage. Both components are widely used to facilitate system modifications, maintenance, and secure closures.
There are various types of threaded bushings and plugs to meet different application needs. Reducing bushings are the most common type, allowing the connection of pipes or fittings of differing diameters. They are available in hexagonal and round shapes, facilitating ease of installation and wrench grip. Threaded plugs, meanwhile, come in multiple types such as hex head plugs, square head plugs, and cone point plugs, each designed to fit specific sealing or pressure requirements. These components are manufactured in threaded (screwed) ends as per industry standards.
Technically, threaded bushings and plugs are produced following stringent standards like ASME B16.11 and MSS-SP-83, ensuring high quality, dimensional accuracy, and pressure resistance. Sizes typically range from 1/8” to 4”, and pressure classes vary from Class 2000, 3000, 6000, to 9000, suitable for high-pressure applications. Materials used include Carbon Steel (ASTM A105, A350 LF2), Stainless Steel (ASTM A182 F304, F316), Alloy Steel (F11, F22, F91), Duplex and Super Duplex Steel, and Nickel Alloys such as Inconel and Monel. The forging and heat treatment processes ensure excellent mechanical properties and corrosion resistance. Threaded bushings and plugs find broad applications in oil and gas, petrochemical, chemical processing, power plants, and marine industries. Their robust design and precise threading make them ideal for providing leak-proof connections and reliable sealing in pipelines, pressure vessels, and machinery. Whether used for system branching, pressure testing, or closing off unused ports, these fittings contribute significantly to operational safety, system integrity, and ease of maintenance.
Forged Threaded Bushings & Plugs – Types Include Hex Bushing, Reducing Bushing, Square Plug, Hex Plug & Bull Plug – Conforming to ASME B16.11 and MSS SP-79 – Ideal for sealing and reducing threaded connections in industrial pipework.
Technical Index
Industrial Threaded Bushing & Plug Standard Specifications
| Threaded Bushing & Plug Size Availability | 1/8″NB TO 4″NB (Threaded NPT/BSP) |
|---|---|
| Pressure Class Ratings | 2000LBS, 3000LBS, 6000LBS, 9000LBS |
| Dimensions | ASME B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95 |
| DIN | DIN 2986, DIN 2999 |
| BS | BS 3799 |
| Thread | BSPP & BSPT Threads, NPTF & NPT Threads, UNF & UN Threads |
| Types | Hex Head Plug, Square Head Plug, Bull Plug, Hex Bushing, Reducing Bushing |
| Material Grades | Carbon Steel (A105, A350 LF2), Stainless Steel (304/304L, 316/316L, 321, 347), Alloy Steel (F11, F22), Duplex, Super Duplex, Inconel, Monel, Hastelloy |
| Coating / Surface Treatment | Black Paint, Anti-rust Coating, Galvanized, Transparent Oil |
| Ends | Threaded Ends (NPT/BSP) |
| Tolerance | As per ASME B16.11 |
| Testing | PMI, Hydro Test, UT, RT, Visual & Dimensional Inspection |
| Certification | EN 10204 3.1 / 3.2, ISO 9001:2015, PED 2014/68/EU (where applicable) |
| Material Sourcing Regions | India, South Korea, Japan, USA, Germany, Italy |
| Global Export Markets | UAE, Saudi Arabia, Oman, Qatar, Bahrain, Kuwait, USA, Malaysia, Singapore, Egypt, Nigeria, South Africa, Kenya, Ghana, Turkey, Brazil, Mexico |
Industrial Forged Plug Standards
| ASME B16.11 – Forged Steel Fittings, Socket-Welding and Threaded | BS 3799 – Screwed and Socket-Welding for the Petroleum Industry | MSS SP-79 – Socket-Welding Reducer Inserts | MSS SP-83 – Class 3000 Steel Pipe Unions, Socket-Welding and Threaded |
| MSS SP-95 – Swage(d) Nipples and Bull Plugs | MSS SP-97 – Integrally Reinforced Forged Branch Outlet Fittings | DIN 2986 – Threaded Fittings | DIN 2999 – Pipe Threads for Fittings (British Standard Pipe Threads) |
| ISO 49 – Malleable Iron Fittings, Threaded | ISO 7/1 – Pipe Threads Where Pressure-tight Joints Are Made on the Threads | EN 10241 – Steel Threaded Pipe Fittings | JIS B2316 – Japanese standard for forged pipe fittings. |
Threaded Bushing & Plug Material Grades and Standards
| Stainless Steel Threaded Bushing & Plug | ASTM / ASME A/SA 182: F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L |
|---|---|
| Duplex Steel Threaded Bushing & Plug | ASTM A182 / ASME SA182 UNS S31803, S32205. Werkstoff No. 1.4462 |
| Super Duplex Steel Threaded Bushing & Plug | ASTM A182 / ASME SA182 UNS S32750, S32760, S32950. Werkstoff No. 1.4410 |
| Carbon Steel Threaded Bushing & Plug | ASTM A105/A694/ A350 LF3/A350 LF2: F42, F46, F52, F56, F60, F65, F70 |
| Alloy Steel Threaded Bushing & Plug | ASTM A182: F1, F5, F9, F11, F22, F91 |
| High Nickel Alloy Threaded Bushing & Plug | ASTM / ASME SB 564 / 160 / 472: UNS 2200 (NICKEL 200), UNS 4400 (MONEL 400), UNS 8825 INCONEL (825), UNS 6600(INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276), UNS 2201 (NICKEL 201), (ALLOY 20 / 20 CB 3) |
| Brass Threaded Bushing & Plug | Brass CA 360, CA 345 and CA 377 / SAE J530, SAE J531 and ASA |
ASME B16.11 Forged Fittings Types
Threaded Bushing Industries & Applications
ASME B16.11 Threaded Bushing & Plug Dimensions
| DIMENSIONS OF THREADED BUSHING (BS 3799) (In mm) | ||||
|---|---|---|---|---|
| Nominal Pipe Size | Length (Minimim) A | |||
| Hex Plugs & Bushings | ||||
| Width Flats (Nominal) F | Hex Height (Min.) | |||
| Bushing G | Plug H | |||
| 1/8” | 9.7 | 11.2 | – | 6.4 |
| 1/4” | 11.2 | 15.7 | 3.0 | 6.4 |
| 3/8” | 12.7 | 17.5 | 4.1 | 7.9 |
| 1/2” | 14.2 | 22.4 | 4.8 | 7.9 |
| 3/4” | 15.7 | 26.9 | 5.6 | 9.7 |
| 1-1/4” | 20.6 | 44.5 | 7.1 | 14.2 |
| 1-1/2” | 20.6 | 50.8 | 7.9 | 15.7 |
| 2” | 22.4 | 63.5 | 8.6 | 17.5 |
| 2-2/2” | 26.9 | 76.2 | 9.7 | 19.1 |
| 3” | 28.4 | 88.9 | 10.4 | 20.6 |
| 4” | 31.8 | 117.3 | 12.7 | 25.4 |
ASME B16.11 Forged Stainless Steel Threaded Plug Dimensions
| DIMENSIONS OF THREADED PLUG (BS 3799) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Nominal Pipe Size | Length (Minimim) A | |||||||
| Plugs Square Head | Plugs Round Head | Hex Plugs & Bushings | ||||||
| Height of Square (Minimum) B | Width Flats (Minimum) C | Nominal Diameter of Head E | Length (Minimum) D | Width Flats (Nominal) F | Hex Height (Min.) | |||
| Bushing G | Plug H | |||||||
| 1” | 19.1 | 12.7 | 20.6 | 33.3 | 50.8 | 35.1 | 6.4 | 9.7 |
| 1/2” | 14.2 | 9.7 | 14.2 | 21.3 | 44.5 | 22.4 | 4.8 | 7.9 |
| 1/4” | 11.2 | 6.6 | 9.7 | 13.5 | 41.1 | 15.7 | 3.0 | 6.4 |
| 1/8” | 9.7 | 6.6 | 7.1 | 10.4 | 35.1 | 11.2 | – | 6.4 |
| 3/8” | 12.7 | 7.9 | 11.2 | 17.5 | 41.1 | 17.5 | 4.1 | 7.9 |
| 3/4” | 15.7 | 11.2 | 15.7 | 26.9 | 44.5 | 26.9 | 5.6 | 9.7 |
| 1-1/2” | 20.6 | 15.7 | 28.4 | 48.5 | 50.8 | 50.8 | 7.9 | 15.7 |
| 1-1/4” | 20.6 | 14.2 | 23.9 | 42.9 | 50.8 | 44.5 | 7.1 | 14.2 |
| 2” | 22.4 | 17.5 | 33.3 | 60.5 | 63.5 | 63.5 | 8.6 | 17.5 |
| 2-2/2” | 26.9 | 19.1 | 38.1 | 73.2 | 69.9 | 76.2 | 9.7 | 19.1 |
| 3” | 28.4 | 20.6 | 42.9 | 88.9 | 69.9 | 88.9 | 10.4 | 20.6 |
| 4” | 31.8 | 25.4 | 53.5 | 114.3 | 76.2 | 117.3 | 12.7 | 25.4 |
Weight Chart of ANSI B16.11 Forged Threaded Bushing
| Normal Pipe Sizes | A | B | QTY | Weight In KG |
|---|---|---|---|---|
| ¼ | 0.81 | 0.88 | 160 | 0.20 |
| ⁄ | 0.97 | 1.00 | 130 | 0.26 |
| ½ | 1.12 | 1.31 | 100 | 0.57 |
| ¾ | 1.31 | 1.5 | 75 | 0.71 |
| 1 | 1.5 | 1.81 | 40 | 1.08 |
| 1 ¼ | 1.75 | 2.19 | 25 | 1.68 |
| 1 ½ | 2.00 | 2.44 | 18 | 2.38 |
| 2 | 2.38 | 2.97 | 10 | 3.55 |
| 2 ½ | 3.00 | 3.62 | 4 | 6.22 |
| 3 | 3.38 | 4.31 | 2 | 10.36 |
| 4 | 4.19 | 5.75 | 1 | 23.91 |
Major Industrial Forged Threaded Bushing & Plug Export Countries
United Arab Emirates (UAE), Jordan, Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, United States of America (USA), Singapore, Malaysia, Azerbaijan, Armenia, Georgia, Egypt, Algeria, Nigeria, South Africa, Kenya, Morocco, Ethiopia, Ghana, Tanzania, Sudan, Uganda, Angola.