ISO 7380Button head (low dome)Hexagon socket
ISO 7380 M4 × 40 Button head (low dome)
ISO 7380 M4 × 40 is a button head socket screw with a 40 mm nominal length, on a M4 × 0.7 mm metric thread. A low dome head with internal hex drive. Chosen when you want a finished look without machining a countersink.
Diameter4 mm
Length40 mm
Pitch0.7 mm
Socket size s2.5 mm
Head Ø dk7.6 mm
HeadButton head (low dome)
DriveHexagon socket
Dimensions
- Standard
- ISO 7380
- Type
- Button head socket screw
- Size
- M4 × 40
- Thread
- M4 × 0.7
- Length L
- 40 mm
- Socket size s
- 2.5 mm
- Head diameter dk
- 7.6 mm
- Head height k
- 2.2 mm
- Drive
- Hexagon socket
- Head
- Button head (low dome)
Nominal values in millimetres as published in ISO 7380. Estimated weight 4.729 g per piece in steel (4.759 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M4 thread pageDesignationM4 × 0.7
Pitch0.7 mm
Major Ø4 mm
Pitch Ø3.55 mm
Minor Ø ext3.14 mm
Tap drillØ 3.3 mm