METRICfine60° flankISO 262

M2 × 0.25 fine Thread Dimensions

M2 x 0.25 (fine) is a fine ISO Metric thread. Pitch is 0.25 mm, equivalent to 101.6 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Major Ø2 mm
Pitch0.25 mm
Threads per inch101.6
Pitch Ø1.84 mm
Tap drill1.75 mm

Thread profile

millimetres unless stated
Thread profile — M2 x 0.25 (fine)d 2d2 1.84d3 1.69mm60°P 0.25h3 0.153tap ⌀1.75
M2 × 0.25 fine — basic profile60° flank angle · Not to scale

Basic information

Designation
M2 x 0.25 (fine)
Thread system
ISO Metric
Series
fine
Standard
ISO 262
Basic profile
ISO 68-1 basic profile
Flank angle
60°

Dimensions

Major diameter
2 mm
Pitch
0.25 mm
Threads per inch
101.6
Pitch diameter
1.84 mm
Minor diameter (external)
1.69 mm
Minor diameter (internal)
1.73 mm
Thread depth
0.153 mm
Recommended tap drill
Ø 1.75 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 parts60 specification pages

All M2 fasteners

Every fastener below is threaded M2 × 0.25 fine, so a nut, bolt or washer picked from this list will mate with it.

DIN 912ISO 4762DIN 934ISO 4032DIN 84ISO 1207DIN 85ISO 1580DIN 963ISO 2009
SpecificationLength
DIN 912 M2 × 4 Hexagon Socket Head Cap Screw4 mm
DIN 912 M2 × 5 Hexagon Socket Head Cap Screw5 mm
DIN 912 M2 × 6 Hexagon Socket Head Cap Screw6 mm
DIN 912 M2 × 8 Hexagon Socket Head Cap Screw8 mm
DIN 912 M2 × 10 Hexagon Socket Head Cap Screw10 mm
DIN 912 M2 × 12 Hexagon Socket Head Cap Screw12 mm
DIN 912 M2 × 16 Hexagon Socket Head Cap Screw16 mm
DIN 912 M2 × 20 Hexagon Socket Head Cap Screw20 mm
ISO 4762 M2 × 4 Hexagon Socket Head Cap Screw4 mm
ISO 4762 M2 × 5 Hexagon Socket Head Cap Screw5 mm
ISO 4762 M2 × 6 Hexagon Socket Head Cap Screw6 mm
ISO 4762 M2 × 8 Hexagon Socket Head Cap Screw8 mm
ISO 4762 M2 × 10 Hexagon Socket Head Cap Screw10 mm
ISO 4762 M2 × 12 Hexagon Socket Head Cap Screw12 mm
ISO 4762 M2 × 16 Hexagon Socket Head Cap Screw16 mm
ISO 4762 M2 × 20 Hexagon Socket Head Cap Screw20 mm
DIN 934 M2 Hexagon Full Nut—
ISO 4032 M2 Hexagon Regular Nut, Style 1—
DIN 84 M2 × 4 Slotted Cheese Head Screw4 mm
DIN 84 M2 × 5 Slotted Cheese Head Screw5 mm
DIN 84 M2 × 6 Slotted Cheese Head Screw6 mm
DIN 84 M2 × 8 Slotted Cheese Head Screw8 mm
DIN 84 M2 × 10 Slotted Cheese Head Screw10 mm
DIN 84 M2 × 12 Slotted Cheese Head Screw12 mm
DIN 84 M2 × 16 Slotted Cheese Head Screw16 mm
ISO 1207 M2 × 4 Slotted Cheese Head Screw — Product Grade A4 mm
ISO 1207 M2 × 5 Slotted Cheese Head Screw — Product Grade A5 mm
ISO 1207 M2 × 6 Slotted Cheese Head Screw — Product Grade A6 mm
ISO 1207 M2 × 8 Slotted Cheese Head Screw — Product Grade A8 mm
ISO 1207 M2 × 10 Slotted Cheese Head Screw — Product Grade A10 mm
ISO 1207 M2 × 12 Slotted Cheese Head Screw — Product Grade A12 mm
ISO 1207 M2 × 16 Slotted Cheese Head Screw — Product Grade A16 mm
DIN 85 M2 × 4 Slotted Pan Head Screw4 mm
DIN 85 M2 × 5 Slotted Pan Head Screw5 mm
DIN 85 M2 × 6 Slotted Pan Head Screw6 mm
DIN 85 M2 × 8 Slotted Pan Head Screw8 mm
DIN 85 M2 × 10 Slotted Pan Head Screw10 mm
DIN 85 M2 × 12 Slotted Pan Head Screw12 mm
DIN 85 M2 × 16 Slotted Pan Head Screw16 mm
ISO 1580 M2 × 4 Slotted Pan Head Screw — Product Grade A4 mm

Showing the first 40 of 60 specification pages.

Related

Other pitches at the same 2 mm diameter — a fine pitch on a coarse diameter, or the reverse, is the usual substitution question.

M2 × 0.4

Neighbouring sizes in ISO Metric.

M1.2 × 0.2 fineM1.4 × 0.2 fineM1.6 × 0.2 fineM1.8 × 0.2 fineM2.5 × 0.35 fineM3 × 0.35 fineM3.5 × 0.35 fineM4 × 0.5 fine