Stanley Proto Industrial Tools

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METRIC WRENCH 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.

WRENCH OR SOCKET SIZE ACROSS FLATS	HEX NUTS STYLE 1	HEX NUTS STYLE 1	SLOTTED AND HAM HEX NUTS	HEAVY HEX NUTS
	Use wrench or socket size shown below
3.20	M1.6 x 0.35	—	—	—
4.00	M2 x 0.4	—	—	—
5.00	M2.5 x 0.45	—	—	—
5.50	M3 x 0.5	M3 x 0.5	—	—
6.00	M3.5 x 0.6	M3.5 x 0.6	—	—
7.00	M4 x 0.7	M4 x 0.7	—	—
8.00	M5 x 0.8	M5 x 0.8	M5 x 0.8	—
10.00	M6 x 1	M6 x 1	M6 x 1	—
13.00	M8 x 1.25	M8 x 1.25	M8 x 1.25	—
15.00	M10 x 1.5	M10 x 1.5	M10 x 1.5	—
16.00	M10 x 1.5	M10 x 1.5	M10 x 1.5	—
18.00	M12 x 1.75	M12 x 1.75	M12 x 1.75	—
21.00	M14 x 2	M14 x 2	M14 x 2	M12 x 1.75
24.00	M16 x 2	M16 x 2	M16 x 2	M14 x 2
27.00	—	—	—	M16 x 2
30.00	M20 x 2.5	M20 x 2.5	M20 x 2.5	—
34.00	—	—	—	M20 x 2.5
36.00	M24 x 3	M24 x 3	M24 x 3	M22 x 2.5
41.00	—	—	—	M24 x 3
46.00	M30 x 3.5	M30 x 3.5	M30 x 3.5	M27 x 3
50.00	—	—	—	M30 x 3.5
55.00	M36 x 4	M36 x 4	M36 x 4	—
60.00	—	—	—	M36 x 4
65.00	—	—	—	—
70.00	—	—	—	M42 x 4.5
75.00	—	—	—	—
80.00	—	—	—	M48 x 5
85.00	—	—	—	—
90.00	—	—	—	M56 x 5.5
95.00	—	—	—	—
100.00	—	—	—	M64 x 6
105.00	—	—	—	—
110.00	—	—	—	M72 x 6
115.00	—	—	—	—
120.00	—	—	—	M80 x 6
130.00	—	—	—	—
135.00	—	—	—	M90 x 6
145.00	—	—	—	—
150.00	—	—	—	M100 x 6

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