AS/NZS 4291.1:1995

Specifies materials, mechanical properties and marking requirements for steel bolts, screws and studs of property classes from 3.6 to 12.9 with ISO metric coarse and fine pitch threads and diameters up to and including 39 mm. The property class system is explained and recommended test programs for acceptance are given. Identical with and reproduced from ISO 898-1:1988.

This part of ISO 898 specifies the mechanical properties of bolts, screws and studs when tested at room temperature (see ISO 1). Properties will vary at higher and lower temperature.This part of ISO 898 applies to bolts, screws and studs- with nominal thread diameter d 39 mm (coarse and fine pitch);- with triangular ISO thread according to ISO 68;- with diameter/pitch combinations according to ISO 261 and ISO 262;- with thread tolerance according to ISO 965-1 and ISO 965-2;- of any shape;- made of carbon steel or alloy steel.It does not apply to set screws and similar threaded fasteners (see ISO 898-5).It does not specify requirements for such properties as- weldability;- corrosion-resistance (see ISO 3506);- ability to withstand temperatures above +300 C or below -50 C.NOTE - The designation system of this part of ISO 898 may be used for sizes outside the limits laid down in this clause (e.g. d > 39 mm), provided that all mechanic al requirements of the property classes are met.

First published as AS/NZS 4291.1:1995.