DIN 7991Countersunk head (90°)Hexagon socket
DIN 7991 M8 × 30 Countersunk head (90°)
DIN 7991 M8 × 30 is a socket countersunk head screw with a 30 mm nominal length, on a M8 × 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.
Diameter8 mm
Length30 mm
Pitch1 mm
Socket size s5 mm
Head Ø dk16 mm
HeadCountersunk head (90°)
DriveHexagon socket
Dimensions
- Standard
- DIN 7991
- Type
- Socket countersunk head screw
- Size
- M8 × 30
- Thread
- M8 × 1
- Length L
- 30 mm
- Socket size s
- 5 mm
- Head diameter dk
- 16 mm
- Head height k
- 4.96 mm
- Thread length b
- 28 mm
- Drive
- Hexagon socket
- Head
- Countersunk head (90°)
Nominal values in millimetres as published in DIN 7991. Estimated weight 16.404 g per piece in steel (16.509 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M8 thread pageDesignationM8 × 1 fine
Pitch1 mm
Major Ø8 mm
Pitch Ø7.35 mm
Minor Ø ext6.77 mm
Tap drillØ 7 mm
Other lengthsDIN 7991 M8
All M8 specificationsInterchangeability
DIN 7991 is catalogued with ISO 10642 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.