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Proof load of steel nuts, coarse thread

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。
Thread designationTensile stress area
[mm2]		Proof load [N]

Notes

  • The proof load is the tensile stress area multiplied by the proof stress.The tensile stress area is calculated as given in JIS B 1082.Checked against the table in the source(JIS B 1052-2:2014, Table 4).
  • Unlike bolts, the proof stress rises with nominal diameter within the same property class.For property class 5 they are 580 / 590 / 610 / 630 N/mm2 の 4 段です。
  • The table covers only the designations given in the source.Nominal diameters of 5 mm and above are covered; M3 and M4 are not in the source. A blank means that, for that size,that property class is not specifiedことを表します （強度区分 9 は呼び径 16 mm 以下だけ）。
  • 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 0205-4, JIS B 1082
Nuts — Proof load — Proof load of steel nuts, coarse thread | Updraft - Mechanical Engineering Calculators