DIN 439Hexagon thin nutExternal hexagon
DIN 439 M20 Hexagon thin nut
DIN 439 M20 is a hexagon thin nut, on a M20 × 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.
Diameter20 mm
Pitch1.5 mm
Socket size s30 mm
Height m10 mm
DriveExternal hexagon
Dimensions
- Standard
- DIN 439
- Type
- Hexagon thin nut
- Size
- M20
- Thread
- M20 × 1.5
- Socket size s
- 30 mm
- Height m
- 10 mm
- Drive
- External hexagon
Nominal values in millimetres as published in DIN 439. Estimated weight 21.226 g per piece in steel (21.361 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M20 thread pageDesignationM20 × 1.5 fine
Pitch1.5 mm
Major Ø20 mm
Pitch Ø19.03 mm
Minor Ø ext18.16 mm
Tap drillØ 18.5 mm
Other lengthsDIN 439 M20
All M20 specificationsInterchangeability
DIN 439 is catalogued with ISO 4035 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.