ISO 4027HeadlessHexagon socket

ISO 4027 M5 × 12 Headless

ISO 4027 M5 × 12 is a socket set screw, cone point with a 12 mm nominal length, on a M5 × 0.8 mm metric thread. ISO cone point counterpart. Cone angle follows the DIN convention: 120° for M6 and above, 90° for M5 and below.

ISO 4027 M5 × 12 — HeadlessNominal dimensions in mm · Not to scale

Diameter5 mm

Length12 mm

Pitch0.8 mm

Socket size s2.5 mm

HeadHeadless

DriveHexagon socket

Dimensions

Standard: ISO 4027
Type: Socket set screw, cone point
Size: M5 × 12
Thread: M5 × 0.8
Length L: 12 mm
Socket size s: 2.5 mm
Drive: Hexagon socket
Head: Headless

Nominal values in millimetres as published in ISO 4027. Estimated weight 1.85 g per piece in steel (1.861 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.

Thread data

Full M5 thread page

DesignationM5 × 0.8

Pitch0.8 mm

Nominal Ø5 mm

Pitch Ø4.48 mm

Minor Ø ext4.02 mm

Tap drillØ 4.2 mm

Other lengthsISO 4027 M5

All M5 specifications

M5 × 5 M5 × 6 M5 × 8 M5 × 10 M5 × 12 M5 × 16 M5 × 20 M5 × 25

Interchangeability

ISO 4027 is catalogued with DIN 914 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.

Equivalent standardDIN 914Hexagon Socket Set Screw — Cone Point ComparisonISO 4027 vs DIN 914Field-by-field differences and a substitution verdict

Choosing and fitting this size

ISO 4027 M5 × 12 is a headless in M5, 12 mm long under the head, on a 0.8 mm coarse pitch. Mating threads should be a matching class nut or a tapped hole of the same nominal size.

Set screws are rated by surface hardness rather than tensile class — the common stock grade is 45H, which is hard enough to bite into a hardened shaft. Stainless set screws are not through-hardened and will not bite the same way, so they are a poor substitute where the point has to grip.

For a tapped hole, M5 × 0.8 mm takes a 4.2 mm tap drill, and the external thread's minor diameter is 4.02 mm — that is the section carrying the load, not the nominal M5 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.