according to ISO 898, part 2
Assignment of possible property classes of screws and nuts
1) Quenched and tempered material
Pairing screws and nuts ≥ 0,8 d
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Screws, bolts, nuts
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Remark In general, nuts of a higher property class are preferable to nuts of a lower property class. This is advisable for a bolt / nut assembly stressed higher than the yield stress or the stress under proof load. |