M5 × 0.8 Thread Dimensions
M5 x 0.8 is a coarse ISO Metric thread. Pitch is 0.8 mm, equivalent to 31.75 threads per inch. The recommended tap drill is nominal diameter minus pitch.
Thread profile
millimetres unless statedBasic information
- Designation
- M5 x 0.8
- Thread system
- ISO Metric
- Series
- coarse
- Standard
- ISO 261
- Basic profile
- ISO 68-1 basic profile
- Flank angle
- 60°
Dimensions
- Major diameter
- 5 mm
- Pitch
- 0.8 mm
- Threads per inch
- 31.75
- Pitch diameter
- 4.48 mm
- Minor diameter (external)
- 4.02 mm
- Minor diameter (internal)
- 4.13 mm
- Thread depth
- 0.491 mm
- Recommended tap drill
- Ø 4.2 mm
How these values are derived
computed from the basic profileThese 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 parts216 specification pages
All M5 fastenersEvery fastener below is threaded M5 × 0.8, so a nut, bolt or washer picked from this list will mate with it.
Showing the first 40 of 216 specification pages.
Related
Other pitches at the same 5 mm diameter — a fine pitch on a coarse diameter, or the reverse, is the usual substitution question.
Neighbouring sizes in ISO Metric.