BS 7814:1995 Specification for bolts and screws incorporating either underhead locking or anti-rotation features
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This British Standard specifies the materials, mechanical properties and marking requirements for bolts and screws incorporating either underhead locking or anti-rotation features whentested at an ambient temperature between 15 °C and 30 °C.
It applies to bolts and screws:
a) with ISO metric M2 to M20 thread sconforming to BS 3643: Part 2: 1981;
b) with mechanical properties 80, 90 or 100¹) as appropriate;
c) for use within the temperature range -50 °C to +250 °C.
As the decarburization of any underhead locking or anti-rotation feature will seriously impair its intended function, partial or complete decarburization as given in BS EN 20898-1 : 1992 does not apply to this standard. There is instead a requirement for carbon restoration to ensure that no decarburization of the locking or anti-rotation feature takes place during the heat treatment process.
NOTE. Performance at temperatures outside the operating range is not within the requirements of this standard.
