Infosheet Measure Screws
SOROTEC GmbH Tel.: +49 (0) 7227-994255-0
Withig 12 Fax: +49 (0) 7227-994255-9
77836 Rheinmünster E-Mail: sorotec@sorotec.de
Version 1.0 Juli 2020
Dimensions
Screw sizes are always given in the form of "diameter x length". In the case of metric screws, the diameter is
given by an M. Wood, sheet metal or plastic screws are not specially marked in the dimensioning. The unit of
measurement mm is usually not specified.
Examples:
M4 x 40 - metric screw with M4 thread and 40 mm length
3 x 25 - wood screw 3 mm in diameter and 25 mm in length
Web: www.sorotec.de
Diameter
Measurements are always made with the vernier caliper and on the
outside of the thread. To prevent the cutting edges of the measuring
jaws from slipping into the thread grooves, the screw is placed
lengthways between the jaws.
Length
Everything that disappears in the material is part of the
length of a screw. This means that measurements are taken
- ideally with the depth gauge of the caliper - from the
underside of the screw head to the end of the screw. Any
parts without a thread are also part of the length.
Exception countersunk screw
Because the head of the countersunk screw disappears
into the material, the head height here is part of the
length. So the length is measured over everything. But
really: Only with the countersunk screw!
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