DIN 7991Countersunk head (90°)Hexagon socket
DIN 7991 M6 × 40 Countersunk head (90°)
DIN 7991 M6 × 40 is a socket countersunk head screw with a 40 mm nominal length, on a M6 × 1 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.
Diameter6 mm
Length40 mm
Pitch1 mm
Socket size s4 mm
Head Ø dk12 mm
HeadCountersunk head (90°)
DriveHexagon socket
Dimensions
- Standard
- DIN 7991
- Type
- Socket countersunk head screw
- Size
- M6 × 40
- Thread
- M6 × 1
- Length L
- 40 mm
- Socket size s
- 4 mm
- Head diameter dk
- 12 mm
- Head height k
- 3.72 mm
- Thread length b
- 24 mm
- Drive
- Hexagon socket
- Head
- Countersunk head (90°)
Nominal values in millimetres as published in DIN 7991. Estimated weight 10.805 g per piece in steel (10.874 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M6 thread pageDesignationM6 × 1
Pitch1 mm
Major Ø6 mm
Pitch Ø5.35 mm
Minor Ø ext4.77 mm
Tap drillØ 5 mm
Other lengthsDIN 7991 M6
All M6 specificationsInterchangeability
DIN 7991 is catalogued with ISO 10642 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.