DIN 439Hexagon thin nutExternal hexagon
DIN 439 M18 Hexagon thin nut
DIN 439 M18 is a hexagon thin nut, on a M18 × 1.5 mm metric thread. A low profile hex nut used as a lock nut against a full nut, or where axial space is tight. Because it carries fewer threads it is not rated for full service load on its own.
Diameter18 mm
Pitch1.5 mm
Socket size s27 mm
Height m9 mm
DriveExternal hexagon
Dimensions
- Standard
- DIN 439
- Type
- Hexagon thin nut
- Size
- M18
- Thread
- M18 × 1.5
- Socket size s
- 27 mm
- Height m
- 9 mm
- Drive
- External hexagon
Nominal values in millimetres as published in DIN 439. Estimated weight 15.474 g per piece in steel (15.572 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M18 thread pageDesignationM18 × 1.5 fine
Pitch1.5 mm
Major Ø18 mm
Pitch Ø17.03 mm
Minor Ø ext16.16 mm
Tap drillØ 16.5 mm
Other lengthsDIN 439 M18
All M18 specificationsInterchangeability
DIN 439 is catalogued with ISO 4035 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.