METRICcoarse60° flankISO 261

M24 × 3 Thread Dimensions

M24 x 3 is a coarse ISO Metric thread. Pitch is 3 mm, equivalent to 8.47 threads per inch. The recommended tap drill is nominal diameter minus pitch.

Major Ø24 mm
Pitch3 mm
Threads per inch8.47
Pitch Ø22.05 mm
Tap drill21 mm

Thread profile

millimetres unless stated
Thread profile — M24 x 3d 24d2 22.05d3 20.32mm60°P 3h3 1.84tap ⌀21
M24 × 3 — basic profile60° flank angle · Not to scale

Basic information

Designation
M24 x 3
Thread system
ISO Metric
Series
coarse
Standard
ISO 261
Basic profile
ISO 68-1 basic profile
Flank angle
60°

Dimensions

Major diameter
24 mm
Pitch
3 mm
Threads per inch
8.47
Pitch diameter
22.05 mm
Minor diameter (external)
20.32 mm
Minor diameter (internal)
20.75 mm
Thread depth
1.84 mm
Recommended tap drill
Ø 21 mm

How these values are derived

computed from the basic profile

These figures follow the ISO 68-1 basic profile of ISO 261. A 60° basic profile has a fundamental triangle height H = 0.866025 × P, with pitch diameter d₂ = d − 0.649519 × P, external minor diameter d₃ = d − 1.226869 × P and internal minor diameter D₁ = d − 1.082532 × P; the two minor diameters differ because the external root is rounded while the internal crest is truncated. The recommended tap drill is given as nominal diameter minus pitch, which approximates 75% thread engagement — adjust it for tough materials or deep holes.

Compatible parts50 specification pages

All M24 fasteners

Every fastener below is threaded M24 × 3, so a nut, bolt or washer picked from this list will mate with it.

DIN 912ISO 4762DIN 933ISO 4017DIN 931ISO 4014DIN 934ISO 4032DIN 439ISO 4035DIN 985ISO 10511
SpecificationLength
DIN 912 M24 × 40 Hexagon Socket Head Cap Screw40 mm
DIN 912 M24 × 50 Hexagon Socket Head Cap Screw50 mm
DIN 912 M24 × 60 Hexagon Socket Head Cap Screw60 mm
DIN 912 M24 × 80 Hexagon Socket Head Cap Screw80 mm
DIN 912 M24 × 100 Hexagon Socket Head Cap Screw100 mm
ISO 4762 M24 × 40 Hexagon Socket Head Cap Screw40 mm
ISO 4762 M24 × 50 Hexagon Socket Head Cap Screw50 mm
ISO 4762 M24 × 60 Hexagon Socket Head Cap Screw60 mm
ISO 4762 M24 × 80 Hexagon Socket Head Cap Screw80 mm
ISO 4762 M24 × 100 Hexagon Socket Head Cap Screw100 mm
DIN 933 M24 × 40 Hexagon Head Screw / Bolt — Full Thread40 mm
DIN 933 M24 × 50 Hexagon Head Screw / Bolt — Full Thread50 mm
DIN 933 M24 × 60 Hexagon Head Screw / Bolt — Full Thread60 mm
DIN 933 M24 × 70 Hexagon Head Screw / Bolt — Full Thread70 mm
DIN 933 M24 × 80 Hexagon Head Screw / Bolt — Full Thread80 mm
DIN 933 M24 × 100 Hexagon Head Screw / Bolt — Full Thread100 mm
DIN 933 M24 × 120 Hexagon Head Screw / Bolt — Full Thread120 mm
ISO 4017 M24 × 40 Hexagon Head Screw — Full Thread, Product Grade A/B40 mm
ISO 4017 M24 × 50 Hexagon Head Screw — Full Thread, Product Grade A/B50 mm
ISO 4017 M24 × 60 Hexagon Head Screw — Full Thread, Product Grade A/B60 mm
ISO 4017 M24 × 70 Hexagon Head Screw — Full Thread, Product Grade A/B70 mm
ISO 4017 M24 × 80 Hexagon Head Screw — Full Thread, Product Grade A/B80 mm
ISO 4017 M24 × 100 Hexagon Head Screw — Full Thread, Product Grade A/B100 mm
ISO 4017 M24 × 120 Hexagon Head Screw — Full Thread, Product Grade A/B120 mm
DIN 931 M24 × 50 Hexagon Head Bolt — Partial Thread50 mm
DIN 931 M24 × 60 Hexagon Head Bolt — Partial Thread60 mm
DIN 931 M24 × 70 Hexagon Head Bolt — Partial Thread70 mm
DIN 931 M24 × 80 Hexagon Head Bolt — Partial Thread80 mm
DIN 931 M24 × 100 Hexagon Head Bolt — Partial Thread100 mm
DIN 931 M24 × 120 Hexagon Head Bolt — Partial Thread120 mm
DIN 931 M24 × 140 Hexagon Head Bolt — Partial Thread140 mm
DIN 931 M24 × 160 Hexagon Head Bolt — Partial Thread160 mm
DIN 931 M24 × 180 Hexagon Head Bolt — Partial Thread180 mm
DIN 931 M24 × 200 Hexagon Head Bolt — Partial Thread200 mm
ISO 4014 M24 × 50 Hexagon Head Bolt — Partial Thread, Product Grade A/B50 mm
ISO 4014 M24 × 60 Hexagon Head Bolt — Partial Thread, Product Grade A/B60 mm
ISO 4014 M24 × 70 Hexagon Head Bolt — Partial Thread, Product Grade A/B70 mm
ISO 4014 M24 × 80 Hexagon Head Bolt — Partial Thread, Product Grade A/B80 mm
ISO 4014 M24 × 100 Hexagon Head Bolt — Partial Thread, Product Grade A/B100 mm
ISO 4014 M24 × 120 Hexagon Head Bolt — Partial Thread, Product Grade A/B120 mm

Showing the first 40 of 50 specification pages.

Related

Other pitches at the same 24 mm diameter — a fine pitch on a coarse diameter, or the reverse, is the usual substitution question.

M24 × 2 fine

Neighbouring sizes in ISO Metric.

M20 × 1.5 fineM22 × 2.5M22 × 2 fineM22 × 1.5 fineM24 × 2 fineM27 × 3M27 × 2 fineM30 × 3.5