DIN 931Hexagon headExternal hexagon
DIN 931 M16 × 50 Hexagon head
DIN 931 M16 × 50 is a hexagon head bolt with a 50 mm nominal length, on a M16 × 1.5 mm metric thread. Same head as DIN 933 but with an unthreaded shank under the head. The plain shank carries shear load, which is why these are preferred for structural steelwork and machinery frames.
Diameter16 mm
Length50 mm
Pitch1.5 mm
Socket size s24 mm
Head height k10 mm
HeadHexagon head
DriveExternal hexagon
Dimensions
- Standard
- DIN 931
- Type
- Hexagon head bolt
- Size
- M16 × 50
- Thread
- M16 × 1.5
- Length L
- 50 mm
- Socket size s
- 24 mm
- Head height k
- 10 mm
- Drive
- External hexagon
- Head
- Hexagon head
Nominal values in millimetres as published in DIN 931. Estimated weight 78.917 g per piece in steel (79.419 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M16 thread pageDesignationM16 × 1.5 fine
Pitch1.5 mm
Major Ø16 mm
Pitch Ø15.03 mm
Minor Ø ext14.16 mm
Tap drillØ 14.5 mm
Other lengthsDIN 931 M16
All M16 specificationsInterchangeability
DIN 931 is catalogued with ISO 4014 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.