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Tool Sizes for Fastening Hardware

Metric Socket-Head Cap Screws

Metric
Clamp Screw
Hex Wrench Size
(mm)
M1.6 1.5
M2 1.5
M2.5 2.0
M3 2.5
M4 3.0
M5 4.0
M6 5.0
M8 6.0
M10 8.0
M12 10.0

Metric Set Screws

Metric
Set Screw
Hex Wrench Size
(mm)
M2 0.9
M2.5 1.3
M3 1.5
M4 2.0
M5 2.5
M6 3.0
M8 4.0
M10 5.0

Inch Socket-Head Cap Screws

Inch
Clamp Screw
Hex Wrench Size
(inches)
#4-40 3/32
#6-32 7/64
#8-32 9/64
#10-32 5/32
1/4-28 3/16
5/16-24 1/4
3/8-24 5/16
1/2-20 3/8

Inch Set Screws

Inch
Set Screw
Hex Wrench Size
(inches)
#6-32 1/16
#8-32 5/64
#10-32 3/32
1/4-20 1/8
5/16-18 5/32
3/8-16 3/16
1/2-13 1/4
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