OEM manufacturer ASME B18.2.2 · DIN 6334
Coupling Nuts — ASME B18.2.2 & DIN 6334
Coupling nuts are long hexagon nuts that join two threaded rods or studs end to end. Teshi Group manufactures hex coupling nuts to ASME B18.2.2 and DIN 6334 in carbon steel, alloy steel and stainless steel.
Also called: hex coupling nuts, extension nuts, rod coupling nuts, long nuts, DIN 6334 nuts
What are Coupling Nuts?
A coupling nut is an internally threaded hexagon bar, several times longer than a standard nut. Two threaded rods are screwed in from each end until they meet near the middle, giving a continuous rod, or a rod is extended to reach a support. Coupling nuts are used on hanger rods for pipe supports, anchor rods, tie rods and long studs. Some are made with a sight hole at mid-length to confirm both rods are engaged.
Key features
- Hex coupling nuts to ASME B18.2.2; metric to DIN 6334 (length 3 × d)
- Carbon steel, ASTM A194 2H / A563 and stainless 304 / 316
- Right-hand thread both ends; left/right-hand on request
- Sight hole option to check rod engagement
- Plain, zinc or hot-dip galvanised finish
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | ASME B18.2.2 (hex coupling nuts), DIN 6334 (metric) |
| Grades — carbon steel | ASTM A307 Gr A / B, ASTM A563 nuts, SAE J429 Gr 2 / 5 / 8, ISO 898-1 class 4.6, 5.6, 8.8, 10.9, 12.9; ASTM F3125 (A325, A490) |
| Grades — alloy steel | ASTM A193 B7, B7M, B16; nuts ASTM A194 2H, 2HM, 3, 7, 7M, 16 |
| Grades — low-temperature | ASTM A320 L7, L7M, L43; nuts ASTM A194 7 / 7M with S3 impact test |
| Grades — high-temperature | ASTM A453 Gr 660 (A286, UNS S66286); ASTM A193 B16 |
| Grades — stainless steel | ASTM A193 / A320 B8, B8M, B8T, B8C (Class 1 and Class 2); nuts ASTM A194 8, 8M, 8T, 8C, 8F; ISO 3506 A2-70, A4-70, A4-80; ASTM F593 / F594 |
| Grades — 904L and 6Mo | 904L (UNS N08904), 254 SMO / 6Mo (UNS S31254) |
| Grades — duplex and super duplex | Duplex UNS S31803 / S32205 and super duplex UNS S32750 / S32760 (ASTM A1082 bolting, A276 / A479 bar) |
| Grades — nickel alloys | Monel 400 (ASTM B164, N04400), Monel K-500 (B865, N05500), Inconel 600 (B166, N06600), Inconel 625 (B446, N06625), Inconel 718 (B637, N07718), Incoloy 825 (B425, N08825), Hastelloy C276 (B574, N10276), Alloy 20 (B473, N08020) |
| Grades — titanium | ASTM B348 Grade 1, 2, 5 (Ti-6Al-4V), 7, 12 |
| Grades — copper-nickel | Cu-Ni 90/10 (C70600) and 70/30 (C71500) against order |
| 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. |
| Threads | UNC, ISO metric coarse; LH/RH on request |
| Finish | Plain, zinc electroplated, hot-dip galvanised |
| Documents | EN 10204 3.1 mill test certificate (3.2 / third-party inspection when specified), dimensional inspection report |
Applications
- Pipe hanger and threaded rod supports
- Anchor rod extensions
- Tie rods and turnbuckle assemblies
- Cable tray and HVAC suspension
Material grades
All gradesFAQ
Coupling Nuts: common questions
What is a coupling nut used for?
A coupling nut joins two threaded rods end to end, or extends a rod or stud that is too short. Common uses are pipe hanger rods, anchor rod extensions and suspended supports for cable tray and ducting.
How long is a coupling nut?
DIN 6334 metric hex coupling nuts are three times the thread diameter long, for example 36 mm for M12. Inch hex coupling nut lengths and widths are given in ASME B18.2.2.
Should the coupling nut match the rod grade?
Yes. Use a coupling nut whose proof load is at least equal to the rod strength, for example a 2H or grade 8 nut with high-strength rod.
Are coupling nuts available in stainless steel?
Yes. Coupling nuts are made in 304 and 316 stainless steel as well as carbon and alloy steel. Stainless coupling nuts are used for hangers in coastal sites, chemical plants and food processing areas.
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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