Workshop: Metric Bolt Sizing

Jul 14, 2026 11:55am · 2 views
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Standard Metric Bolt Pitches

SizeCoarse PitchFine Pitch
M30.5mm-
M40.7mm-
M50.8mm-
M61.0mm-
M81.25mm1.0mm
M101.5mm1.25mm

Drill Size Formula: Diameter - Pitch = Tap Drill Size (e.g., M5 - 0.8 = 4.2mm drill).