DIN 931Hexagon headExternal hexagon

DIN 931 M16 × 60 Hexagon head

DIN 931 M16 × 60 is a hexagon head bolt with a 60 mm nominal length, on a M16 × 1.5 mm metric thread. Same head as DIN 933 but with an unthreaded shank under the head. The plain shank carries shear load, which is why these are preferred for structural steelwork and machinery frames.

DIN 931 M16 × 60 — Hexagon headNominal dimensions in mm · Not to scale

Diameter16 mm

Length60 mm

Pitch1.5 mm

Socket size s24 mm

Head height k10 mm

HeadHexagon head

DriveExternal hexagon

Dimensions

Standard: DIN 931
Type: Hexagon head bolt
Size: M16 × 60
Thread: M16 × 1.5
Length L: 60 mm
Socket size s: 24 mm
Head height k: 10 mm
Drive: External hexagon
Head: Hexagon head

Nominal values in millimetres as published in DIN 931. Estimated weight 94.7 g per piece in steel (95.303 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.

Thread data

Full M16 thread page

DesignationM16 × 1.5 fine

Pitch1.5 mm

Nominal Ø16 mm

Pitch Ø15.03 mm

Minor Ø ext14.16 mm

Tap drillØ 14.5 mm

Other lengthsDIN 931 M16

All M16 specifications

M16 × 35 M16 × 40 M16 × 50 M16 × 60 M16 × 70 M16 × 80 M16 × 100 M16 × 120 M16 × 140 M16 × 160

Interchangeability

DIN 931 is catalogued with ISO 4014 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.

Equivalent standardISO 4014Hexagon Head Bolt — Partial Thread, Product Grade A/B ComparisonDIN 931 vs ISO 4014Field-by-field differences and a substitution verdict

Choosing and fitting this size

DIN 931 M16 × 60 is a hexagon head in M16, 60 mm long under the head, on a 1.5 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, M16 × 1.5 mm takes a 14.5 mm tap drill, and the external thread's minor diameter is 14.16 mm — that is the section carrying the load, not the nominal M16 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.