DIN 7991Countersunk head (90°)Hexagon socket
DIN 7991 M12 × 40 Countersunk head (90°)
DIN 7991 M12 × 40 is a socket countersunk head screw with a 40 mm nominal length, on a M12 × 1.5 mm metric thread. Flat head version of the socket screw. The 90° cone seats flush in a matching countersink so nothing protrudes above the surface.
Diameter12 mm
Length40 mm
Pitch1.5 mm
Socket size s8 mm
Head Ø dk24 mm
HeadCountersunk head (90°)
DriveHexagon socket
Dimensions
- Standard
- DIN 7991
- Type
- Socket countersunk head screw
- Size
- M12 × 40
- Thread
- M12 × 1.5
- Length L
- 40 mm
- Socket size s
- 8 mm
- Head diameter dk
- 24 mm
- Head height k
- 7.44 mm
- Thread length b
- 36 mm
- Drive
- Hexagon socket
- Head
- Countersunk head (90°)
Nominal values in millimetres as published in DIN 7991. Estimated weight 50.925 g per piece in steel (51.249 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M12 thread pageDesignationM12 × 1.5 fine
Pitch1.5 mm
Major Ø12 mm
Pitch Ø11.03 mm
Minor Ø ext10.16 mm
Tap drillØ 10.5 mm
Other lengthsDIN 7991 M12
All M12 specificationsInterchangeability
DIN 7991 is catalogued with ISO 10642 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.