DIN 912Socket head (cylindrical)Hexagon socket

DIN 912 M24 × 80 Socket head (cylindrical)

DIN 912 M24 × 80 is a socket head cap screw with a 80 mm nominal length, on a M24 × 2 mm metric thread. A cap screw with a cylindrical head and internal hex drive. Because the head sits above the surface and the drive is recessed, it can be tightened hard and used in counterbores for a flush finish.

DIN 912 M24 × 80 — Socket head (cylindrical)Nominal dimensions in mm · Not to scale

Diameter24 mm

Length80 mm

Pitch2 mm

Socket size s19 mm

Head Ø dk36 mm

HeadSocket head (cylindrical)

DriveHexagon socket

Dimensions

Standard: DIN 912
Type: Socket head cap screw
Size: M24 × 80
Thread: M24 × 2
Length L: 80 mm
Socket size s: 19 mm
Head diameter dk: 36 mm
Head height k: 24 mm
Thread length b: 60 mm
Drive: Hexagon socket
Head: Socket head (cylindrical)

Nominal values in millimetres as published in DIN 912. Estimated weight 475.868 g per piece in steel (478.899 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.

Thread data

Full M24 thread page

DesignationM24 × 2 fine

Pitch2 mm

Nominal Ø24 mm

Pitch Ø22.7 mm

Minor Ø ext21.55 mm

Tap drillØ 22 mm

Other lengthsDIN 912 M24

All M24 specifications

M24 × 40 M24 × 50 M24 × 60 M24 × 80 M24 × 100

Interchangeability

DIN 912 is catalogued with ISO 4762 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.

Equivalent standardISO 4762Hexagon Socket Head Cap Screw ComparisonDIN 912 vs ISO 4762Field-by-field differences and a substitution verdict

Choosing and fitting this size

DIN 912 M24 × 80 is a socket head (cylindrical) in M24, 80 mm long under the head, on a 2 mm coarse pitch. Mating threads should be a matching class nut or a tapped hole of the same nominal size.

Common stock grades are 8.8, 10.9 and 12.9 in steel, plus A2-70 and A4-80 in stainless. Class 10.9 and 12.9 carry roughly 1.25 and 1.5 times the proof load of 8.8, but they also need a properly rated mating nut — a class 8 nut under a 12.9 bolt simply moves the failure into the thread. Zinc-plated 10.9 and above should be baked to avoid hydrogen embrittlement.

For a tapped hole, M24 × 2 mm takes a 22 mm tap drill, and the external thread's minor diameter is 21.55 mm — that is the section carrying the load, not the nominal M24 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.