METRICfine60° flankISO 262

M12 × 1.25 fine Thread Dimensions

M12 x 1.25 (fine) is a fine ISO Metric thread. Pitch is 1.25 mm, equivalent to 20.32 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Major Ø12 mm
Pitch1.25 mm
Threads per inch20.32
Pitch Ø11.19 mm
Tap drill10.75 mm

Thread profile

millimetres unless stated
Thread profile — M12 x 1.25 (fine)d 12d2 11.19d3 10.47mm60°P 1.25h3 0.767tap ⌀10.75
M12 × 1.25 fine — basic profile60° flank angle · Not to scale

Basic information

Designation
M12 x 1.25 (fine)
Thread system
ISO Metric
Series
fine
Standard
ISO 262
Basic profile
ISO 68-1 basic profile
Flank angle
60°

Dimensions

Major diameter
12 mm
Pitch
1.25 mm
Threads per inch
20.32
Pitch diameter
11.19 mm
Minor diameter (external)
10.47 mm
Minor diameter (internal)
10.65 mm
Thread depth
0.767 mm
Recommended tap drill
Ø 10.75 mm

How these values are derived

computed from the basic profile

These figures follow the ISO 68-1 basic profile of ISO 262. A 60° basic profile uses a fundamental triangle height H = 0.866025 × P, with external minor diameter d₃ = d − 1.226869 × P and internal minor diameter D₁ = d − 1.082532 × P; the two differ because the external root is rounded while the internal crest is truncated. A 55° Whitworth profile uses H = 0.960491 × P and a thread height of 0.640327 × P. 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 parts168 specification pages

All M12 fasteners

Every fastener below is threaded M12 × 1.25 fine, so a nut, bolt or washer picked from this list will mate with it.

DIN 912ISO 4762DIN 7991ISO 10642ISO 7380DIN 7984DIN 933ISO 4017DIN 931ISO 4014DIN 934ISO 4032DIN 439ISO 4035DIN 985ISO 10511ISO 4161DIN 6923DIN 916DIN 914DIN 915DIN 913ISO 4029ISO 4027ISO 4028ISO 4026
SpecificationLength
DIN 912 M12 × 20 Hexagon Socket Head Cap Screw20 mm
DIN 912 M12 × 25 Hexagon Socket Head Cap Screw25 mm
DIN 912 M12 × 30 Hexagon Socket Head Cap Screw30 mm
DIN 912 M12 × 35 Hexagon Socket Head Cap Screw35 mm
DIN 912 M12 × 40 Hexagon Socket Head Cap Screw40 mm
DIN 912 M12 × 50 Hexagon Socket Head Cap Screw50 mm
DIN 912 M12 × 60 Hexagon Socket Head Cap Screw60 mm
DIN 912 M12 × 80 Hexagon Socket Head Cap Screw80 mm
DIN 912 M12 × 100 Hexagon Socket Head Cap Screw100 mm
ISO 4762 M12 × 20 Hexagon Socket Head Cap Screw20 mm
ISO 4762 M12 × 25 Hexagon Socket Head Cap Screw25 mm
ISO 4762 M12 × 30 Hexagon Socket Head Cap Screw30 mm
ISO 4762 M12 × 35 Hexagon Socket Head Cap Screw35 mm
ISO 4762 M12 × 40 Hexagon Socket Head Cap Screw40 mm
ISO 4762 M12 × 50 Hexagon Socket Head Cap Screw50 mm
ISO 4762 M12 × 60 Hexagon Socket Head Cap Screw60 mm
ISO 4762 M12 × 80 Hexagon Socket Head Cap Screw80 mm
ISO 4762 M12 × 100 Hexagon Socket Head Cap Screw100 mm
DIN 7991 M12 × 20 Hexagon Socket Countersunk Head Screw20 mm
DIN 7991 M12 × 25 Hexagon Socket Countersunk Head Screw25 mm
DIN 7991 M12 × 30 Hexagon Socket Countersunk Head Screw30 mm
DIN 7991 M12 × 35 Hexagon Socket Countersunk Head Screw35 mm
DIN 7991 M12 × 40 Hexagon Socket Countersunk Head Screw40 mm
DIN 7991 M12 × 50 Hexagon Socket Countersunk Head Screw50 mm
DIN 7991 M12 × 60 Hexagon Socket Countersunk Head Screw60 mm
DIN 7991 M12 × 80 Hexagon Socket Countersunk Head Screw80 mm
DIN 7991 M12 × 100 Hexagon Socket Countersunk Head Screw100 mm
ISO 10642 M12 × 20 Hexagon Socket Countersunk Head Screw20 mm
ISO 10642 M12 × 25 Hexagon Socket Countersunk Head Screw25 mm
ISO 10642 M12 × 30 Hexagon Socket Countersunk Head Screw30 mm
ISO 10642 M12 × 35 Hexagon Socket Countersunk Head Screw35 mm
ISO 10642 M12 × 40 Hexagon Socket Countersunk Head Screw40 mm
ISO 10642 M12 × 50 Hexagon Socket Countersunk Head Screw50 mm
ISO 10642 M12 × 60 Hexagon Socket Countersunk Head Screw60 mm
ISO 10642 M12 × 80 Hexagon Socket Countersunk Head Screw80 mm
ISO 10642 M12 × 100 Hexagon Socket Countersunk Head Screw100 mm
ISO 7380 M12 × 20 Hexagon Socket Button Head Screw20 mm
ISO 7380 M12 × 25 Hexagon Socket Button Head Screw25 mm
ISO 7380 M12 × 30 Hexagon Socket Button Head Screw30 mm
ISO 7380 M12 × 35 Hexagon Socket Button Head Screw35 mm

Showing the first 40 of 168 specification pages.

Related

Other pitches at the same 12 mm diameter — a fine pitch on a coarse diameter, or the reverse, is the usual substitution question.

M12 × 1.75M12 × 1.5 fine

Neighbouring sizes in ISO Metric.

M10 × 1.25 fineM10 × 1 fineM11 × 1 fineM12 × 1.5 fineM14 × 1.5 fineM16 × 1.5 fineM18 × 2 fineM18 × 1.5 fine