ISO 898
Standard for bolts, screws etc. / From Wikipedia, the free encyclopedia
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ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M.[1] It is divided into five (nonconsecutive) parts:
1. Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread[2]
2. Nuts with specified proof load values – Coarse thread[3]
3. Flat washers with specified property classes[4]
5. Set screws and similar threaded fasteners not under tensile stresses[5][6]
6. (Now withdrawn) Nuts with specified proof load values – Fine pitch thread[7]
7. Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm[8]
With exception to part 7, which defines test standards, the parts of this standard define properties for fasteners made of carbon steel and alloy steel. The standards define that the testing must be performed at ambient temperatures, which is defined as between 10 and 35 °C (50 and 95 °F). The standards do not cover fasteners that would otherwise apply but require special properties, such as weldability or corrosion resistance.[2][3][5]