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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)
M1.615
M216
M2.518
M319
M422
M525
M628
M834
M1040
M1246
M1658
M2070


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)
M33
M410
M512
M616
M820
M1025
M1230


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: