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Stainless Steel Hexagon Coupling Nuts
DIN 6334 stainless steel coupling nuts, also known as extension nuts, are elongated hexagon nuts designed to join or extend two externally threaded components, typically threaded bar or studs.
The increased nut height provides enhanced thread engagement compared with standard hexagon nuts.
Applicable Standard
- DIN 6334 – Hexagon coupling nuts (elongated)
- Mechanical properties in accordance with EN ISO 3506
Material
- A2/50 Stainless Steel (304)
- A4/50 Stainless Steel (316)
- A2/70 and A4/80 made to order
Sizes
M6–M36.
Specific Features
- Hexagon external profile
- Fully threaded internal bore
- Standard metric coarse thread
Performance
- Increased thread engagement for improved load distribution
- Suitable for external, corrosive, and marine environments
- Compatible with stainless steel threaded rod systems
Typical Applications
- Joining or extending stainless threaded bar or studding
- Structural tie bar systems
- Façade support and restraint assemblies
- Anchoring and holding down applications
- Civil, construction, and industrial engineering fixings
Installation Notes
- Tightened using standard spanners or sockets
- Full thread engagement recommended
- Anti galling measures advised for stainless steel assemblies
Dimensions & Design
Overall nut height approximately 3 × nominal thread diameter, as defined by DIN 6334.
| Product | Thread Size (d) | Pitch | s | L | |
|---|---|---|---|---|---|
| M6 | 6 | 1 | 10 | 18 | |
| M8 | 8 | 1.25 | 13 | 24 | |
| M10 | 10 | 15 | 17 | 30 | |
| M12 | 12 | 1.75 | 19 | 36 | |
| M14 | 14 | 2 | 22 | 42 | |
| M16 | 16 | 2 | 24 | 48 | |
| M18 | 18 | 2.5 | 27 | 54 | |
| M20 | 20 | 2.5 | 30 | 60 | |
| M22 | 22 | 2.5 | 32 | 66 | |
| M24 | 24 | 3 | 36 | 72 | |
| M27 | 27 | 3 | 41 | 81 | |
| M30 | 30 | 3.5 | 46 | 90 | |
| M33 | 33 | 3.5 | 50 | 99 | |
| M36 | 36 | 4 | 55 | 108 |
Stainless Steel Hexagon Coupling Nuts datasheet
(PDF, 807 KB)