Stanley Proto Industrial Tools

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BOLT SIZING CHART

Nominal Opening of Proto Wrenches or Sockets in Millimeters
to Fit Standard Nuts

Locate thread diameter of nut in left column. Then move across to box which has proper identification of nut at top of vertical column. The size in this particular box is the nominal opening size in inches of the PROTO wrench and sockets that will fit.

Thread Diameter of NUTS	HEX NUTS STYLE 1	HEX NUTS STYLE 2	SLOTTED AND HAM HEX NUTS	HEAVY HEX BOLTS
	Use wrench or socket size shown below
M1.6 x 0.35	3.20	—	—	—
M2 x 0.4	4.00	—	—	—
M2.5 x 0.45	5.00	—	—	—
M3 x 0.5	5.50	5.50	—	—
M3.5 x 0.6	6.00	6.00	—	—
M4 x 0.7	7.00	7.00	—	—
M5 x 0.8	8.00	8.00	8.00	—
M6 x 1	10.00	10.00	10.00	—
M8 x 1.25	13.00	13.00	13.00	—
M10 x 1.5	15.00 & 16.00	15.00 & 16.00	15.00 & 16.00	—
M12 x 1.75	18.00	18.00	18.00	21.00
M14 x 2	21.00	21.00	21.00	24.00
M16 x 2	24.00	24.00	24.00	27.00
M20 x 2.5	30.00	30.00	30.00	34.00
M22 x 2.5	—	—	—	36.00
M24 x 3	36.00	36.00	36.00	41.00
M27 x 3	—	—	—	46.00
M30 x 3.5	46.00	46.00	46.00	50.00
M36 x 4	55.00	55.00	55.00	60.00
M42 x 4.5	—	—	—	70.00
M48 x 5	—	—	—	80.00
M56 x 5.5	—	—	—	90.00
M64 x 6	—	—	—	100.00
M72 x 6	—	—	—	110.00
M80 x 6	—	—	—	120.00
M90 x 6	—	—	—	135.00
M100 x 6	—	—	—	150.00

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