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Metric coarse thread chart (ISO)

Every ISO metric coarse size from M1 to M64 on one sheet: pitch, pitch and minor diameters, the standard tap drill, all three ISO 273 clearance holes and the hex across-flats.

Metric coarse thread chart (ISO)

34 sizes · ThreadRef · free sample of 8 representative sizes

Metric coarse thread chart (ISO). Every ISO metric coarse size from M1 to M64 on one sheet: pitch, pitch and minor diameters, the standard tap drill, all three ISO 273 clearance holes and the hex across-flats.
SizePitch
mm
Pitch dia
mm
Minor dia
mm
Tap drill
mm
Clearance close
mm
Clearance normal
mm
Clearance loose
mm
Hex A/F
M3 × 0.50.52.6752.4592.53.23.43.65.5 mm
M5 × 0.80.84.484.1344.25.35.55.88 mm
M6 × 1.015.3514.91856.46.6710 mm
M8 × 1.251.257.1886.6476.758.491013 mm
M10 × 1.51.59.0268.3768.510.5111216 mm
M12 × 1.751.7510.86310.10610.251313.514.518 mm
M16 × 2.0214.70113.835141717.518.524 mm
M20 × 2.52.518.37617.29417.521222430 mm

Dimensions per ISO 68-1 / ISO 261; clearance holes per ISO 273; wrench sizes per ISO 4017. ISO 261 / ISO 68-1.

Torque figures are estimates that depend on the stated nut-factor assumption. Verify against your fastener manufacturer's data and joint requirements before assembly.

Every figure on this chart is also free on its own size page - tap any size in the first column to open it, or browse the full reference. Premium pays for the sheet, not the numbers.