Proof load
Material and thread type
Steel nuts (coarse thread)ISO 898-2 (JIS B 1052-2)Unlike bolts, the proof stress rises with nominal diameter within the same property class.Steel nuts (fine thread)ISO 898-6 (JIS B 1052-6)並目ねじとは別の規格です。同じ強度区分でも応力が高く、使える呼び径の範囲も狭くなります。Stainless steel nuts (coarse thread)ISO 3506-2 (JIS B 1054-2)保証荷重応力は呼び径では変わらず、ナットの高さで 2 つに分かれます。Stainless steel nuts (fine thread)ISO 3506-2 (JIS B 1054-2)保証荷重応力は並目ねじと同じです。有効断面積が大きくなるぶん、保証荷重も大きくなります。
Notes
- There is no proof load table in the source; the values are the tensile stress area multiplied by the proof stress.The tensile stress area is calculated as given in JIS B 1082.Where the source has the same table, the values have been checked against it.(the source has no table for stainless steel nuts).
- The values here are for room temperature.Mechanical properties change at high and low temperatures, so do not apply these values directly.
- Sources: JIS B 1052-2, JIS B 1052-6, JIS B 1054-2, JIS B 0205-4, JIS B 1082