Q41.uk - Metric Bolt Sizes
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Note
Some pages may contain inaccuracies
Metric Bolts
BoltDrillSpanner
Hexagonal
Head
Hex WrenchTap and DieTapping Drill mmDie shank mm
M1.61.73.2 M1.61.251.6
M22.14 M21.62
M2.52.655 M2.52.12.5
M33.155.5 M32.53
M3.53.76 M3.52.93.5
M44.273M43.34
M55.2584M54.25
M66.3105M656
M88.4136M878
M1010.5178M108.810
M1212.61910M1210.812
M1616.752414M1614.516
M18192714M181618
M20213017M2018.520
Hex wrench (Allan Key) sizes vary. They are usually the listed size for larger heads or one size below for smaller heads. Drill size is the smallest hole bolt will easily fit. If the drill bit exactly matches bolt, the fit may be too tight. Using next largest standard drill bit for home use is usually acceptable but engineers will have other concerns. The tapping drill and die shank sizes are used when cutting threads.