DIN 916HeadlessHexagon socket

DIN 916 M6 × 30 Headless

DIN 916 M6 × 30 is a socket set screw, cup point with a 30 mm nominal length, on a M6 × 1 mm metric thread. A headless grub screw with a cupped end that digs into the shaft. Common for locking collars, pulleys and knobs onto shafts.

DIN 916 M6 × 30 — HeadlessNominal dimensions in mm · Not to scale

Diameter6 mm

Length30 mm

Pitch1 mm

Socket size s3 mm

HeadHeadless

DriveHexagon socket

Dimensions

Standard: DIN 916
Type: Socket set screw, cup point
Size: M6 × 30
Thread: M6 × 1
Length L: 30 mm
Socket size s: 3 mm
Drive: Hexagon socket
Head: Headless

Nominal values in millimetres as published in DIN 916. Estimated weight 6.659 g per piece in steel (6.701 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.

Thread data

Full M6 thread page

DesignationM6 × 1

Pitch1 mm

Nominal Ø6 mm

Pitch Ø5.35 mm

Minor Ø ext4.77 mm

Tap drillØ 5 mm

Other lengthsDIN 916 M6

All M6 specifications

M6 × 6 M6 × 8 M6 × 10 M6 × 12 M6 × 16 M6 × 20 M6 × 25 M6 × 30

Interchangeability

DIN 916 is catalogued with ISO 4029 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.

Equivalent standardISO 4029Hexagon Socket Set Screw — Cup Point ComparisonDIN 916 vs ISO 4029Field-by-field differences and a substitution verdict

Choosing and fitting this size

DIN 916 M6 × 30 is a headless in M6, 30 mm long under the head, on a 1 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, M6 × 1 mm takes a 5 mm tap drill, and the external thread's minor diameter is 4.77 mm — that is the section carrying the load, not the nominal M6 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.