ISO 4029HeadlessHexagon socket
ISO 4029 M8 × 40 Headless
ISO 4029 M8 × 40 is a socket set screw with a 40 mm nominal length, on a M8 × 1 mm metric thread. ISO equivalent of DIN 916, same cup point geometry and socket sizes.
Diameter8 mm
Length40 mm
Pitch1 mm
Socket size s4 mm
HeadHeadless
DriveHexagon socket
Dimensions
- Standard
- ISO 4029
- Type
- Socket set screw
- Size
- M8 × 40
- Thread
- M8 × 1
- Length L
- 40 mm
- Socket size s
- 4 mm
- Drive
- Hexagon socket
- Head
- Headless
Nominal values in millimetres as published in ISO 4029. Estimated weight 15.783 g per piece in steel (15.884 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 lengthsISO 4029 M8
All M8 specificationsInterchangeability
ISO 4029 is catalogued with DIN 916 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.