Northwest Fastener And Supply, Inc. Tool Size Chart
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111320 FM 529 RD BLDG F
HOUSTON, TEXAS 77041
TEL (713) 896-1166
FAX (713) 896-7879
Tool Size Chart
Wrench Size
Diameter
Hex Key Size
Inch Fasteners
Metric Fasteners
Wrench Sizes (in.)
Hex Key Sizes (in.)
Wrench & Hex Key Sizes (mm)
Diameter
Hex
Heavy Hex
Diameter
Socket
Diameter
Hex
Socket
1/4
7/16
#1
1/16
M3
5.50
2.50
5/16
1/2
#2
5/64
M4
7.00
3.00
3/8
9/16
#3
5/64
M5
8.00
4.00
7/16
5/8
#4
3/32
M6
10.00
5.00
1/2
3/4
7/8
#5
3/32
M8
13.00
6.00
9/16
13/16
#6
7/64
M10
17.00
8.00
5/8
15/16
1 1/16
#8
9/64
M12
19.00
10.00
3/4
1 1/8
1 1/4
#10
5/32
M14
21.00
12.00
7/8
1/4
M16
1 5/16
1 7/16
3/16
24.00
14.00
1
1 1/2
1 5/8
5/16
1/4
M18
27.00
14.00
1 1/8
1 11/16
1 13/16
3/8
5/16
M20
30.00
17.00
1 1/4
1 7/8
2
7/16
3/8
M22
32.00
17.00
1 3/8
2 1/16
2 3/16
1/2
3/8
M24
36.00
19.00
1 1/2
2 1/4
2 3/8
5/8
1/2
M27
41.00
19.00
1 3/4
2 5/8
2 3/4
3/4
5/8
M30
46.00
22.00
2
3
3 1/8
7/8
3/4
M33
50.00
24.00
2 1/4
3 3/8
3 1/2
1
3/4
M36
55.00
27.00
2 1/2
3 3/4
3 7/8
1 1/8
7/8
M42
65.00
32.00
2 3/4
1 1/4
M48
4 1/8
4 1/4
7/8
75.00
36.00
3
1 3/8
4 1/2
4 5/8
1
1 1/2
1
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