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Metric fine thread chart (ISO)

The ISO metric fine-pitch series - every published fine pitch for each nominal diameter, with pitch and minor diameters, tap drill and clearance holes.

Metric fine thread chart (ISO)

65 sizes · ThreadRef · free sample of 8 representative sizes

Metric fine thread chart (ISO). The ISO metric fine-pitch series - every published fine pitch for each nominal diameter, with pitch and minor diameters, tap drill and clearance holes.
SizePitch
mm
Pitch dia
mm
Minor dia
mm
Tap drill
mm
Clearance close
mm
Clearance normal
mm
Clearance loose
mm
Hex A/F
M8 × 1.017.3516.91878.491013 mm
M10 × 1.251.259.1888.6478.7510.5111216 mm
M12 × 1.251.2511.18810.64710.751313.514.518 mm
M12 × 1.51.511.02610.37610.51313.514.518 mm
M14 × 1.51.513.02612.37612.51515.516.521 mm
M16 × 1.51.515.02614.37614.51717.518.524 mm
M20 × 1.51.519.02618.37618.521222430 mm
M24 × 2.0222.70121.8352225262836 mm

Dimensions per ISO 68-1 / ISO 262; clearance holes per ISO 273. ISO 262 / 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.