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Spanner Sizes

Standard Spanner Sizes

Metric     UNF/UNC
Nominal Size Spanner Size
M1.6 3.2mm
M2 4mm
M2.5 5mm
M3 5mm
M3.5 6mm
M4 7mm
M5 8mm
M6 10mm
M7 11mm
M8 13mm
M10 17mm
M12 19mm
M14 22mm
M16 24mm
M18 27mm
M20 30mm
M22 32mm
M24 36mm
 
Nominal Size Spanner Size
no.0 Nut 5/32"
no.2 Nut 3/16"
no.4 Nut 1/4"
no.6 Nut 5/16"
no.8 Nut 11/32"
no.8 Bolt 1/4"
no.10 & 3/16" Nut 3/8"
no.10 & 3/16" Bolt 5/16"
1/4" 7/16"
5/16" 1/2" (9/16" for Dome Nut)
3/8" 9/16"
7/16" Full Nut 11/16"
7/16" Bolt & Nyloc Nut 5/8"
1/2" 3/4"
9/16" Nut 7/8"
9/16" Bolt 13/16"
5/8" 15/16"
3/4" 1 1/8"
7/8" 1 5/16"