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Property classes of steel bolts

Steel boltsISO 898-1 (JIS B 1051)強度区分 X.Y の X×100 が引張強さ、それに Y/10 を掛けた値が耐力になります。Stainless steel fastenersISO 3506-1 (JIS B 1054-1)鋼とは決め方が違い、区分の値を 10 倍した数が引張強さの最小値になります。Non-ferrous fastenersISO 8839 (JIS B 1057)銅合金とアルミニウム合金。強度区分ではなく材質区分と合金番号で決まります。Effect of temperatureJIS B 1054-1 附属書F常温から外れたときの機械的性質。温度ごとの数値が規格にあるのはステンレス鋼だけです。
Property classApplicable nominal diameterTensile strength
Nominal [N/mm2]		Tensile strength
Min. [N/mm2]		Yield strength
Nominal [N/mm2]		Yield strength
Min. [N/mm2]		Specified yield strengthProof stress
[N/mm2]		MaterialHeat treatment

Notes

  • Tensile strength and yield strength are each given twice: as a nominal value and as a minimum.The property class follows from the nominal value, so read across from the nominal value rather than the minimum.
  • For property classes 4.8, 5.8 and 6.8 the yield strength is specified as the stress at 0.0048d extension, and the minimum comes out above the nominal value.9.8 は呼び径 16 mm 以下にだけ 規定があります。
  • Heat treatment becomes mandatory at 8.8, which is the same boundary as the change in how yield strength is specified.4.6〜6.8 は熱処理なし、8.8 以上は焼入焼戻しです。
  • Source: JIS B 1051
Bolts — Property class — Property classes of steel bolts | Updraft - Mechanical Engineering Calculators