This standard specifies a system of designation for bolts, screws, studs and nuts (‘fasteners’, for short), and also gives supplementary order designations for special features and finishes of such fasteners (e.g type of thread, thread end, slotting of bolt head or nut, hardness). Where no specifications have been given for the dimensions of such features (e.g. for thread ends), the relevant standards (e.g. DIN 76 Part 1 and DIN 78) shall apply.

Fasteners are not expected to conform to the designs illustrated here.

The designations specified here may also be appended as supplementary information to ISO designations (cf. clause 4).