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Metric Fasteners
Machine Screws
ISO metric machine screws are limited to four different head shapes:
countersunk, raised countersunk, panhead, and
cheesehead.
All head dimensions are directly related to the basic screw diameter as
follows:
Size |
Minimum Length (mm) |
M1.6 | 15 |
M2 | 16 |
M2.5 | 18 |
M3 | 19 |
M4 | 22 |
M5 | 25 |
M6 | 28 |
M8 | 34 |
M10 | 40 |
M12 | 46 |
M16 | 58 |
M20 | 70 |
Socket Screws
ISO metric hexagon socket screws are limited to two different head
shapes: cap screw, and countersunk socket screw.
All head dimensions are directly related to the basic screw diameter as
follows:
Size |
Minimum Length (mm) |
M3 | 3 |
M4 | 10 |
M5 | 12 |
M6 | 16 |
M8 | 20 |
M10 | 25 |
M12 | 30 |
Nuts and Washers
The nut and washer dimensions are related to the basic screw diameter
as follows:
Bolts
Bolt head dimensions are related to their diameter as follows:
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