O... Glossary of Fastener and Fixing Terminology
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A bolt or screw whose head cross section is a regular polygon with 8 sides or recess is 8 sided. Recess screws can be removed with a square driver.
A quench from the hardening temperature, in which oil is the cooling medium
A rounded end which is used, particularly for set and adjusting screws, to apply pressure without cutting action. Product
Tapping of a thread following a plating or galvanised coating operation so that the thread tolerances comply within specification allowing the internal and external threads to assemble. It is normal practice to overtap the internal rather than the external thread. Detail