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Proof load of bolts, fine thread

Coarse threadISO 898-1 (JIS B 1051)The ordinary thread, with one pitch fixed for each nominal diameter. Use it unless something else is specified.Fine threadISO 898-1 (JIS B 1051)The proof stress is the same as for the coarse series. The finer pitch gives a larger stress area, and the proof load rises by the same amount.
Thread designationPitch
[mm]		Effective sectional area
[mm2]		Proof load [N]

Notes

  • The proof load is the effective sectional area multiplied by the proof stress. The effective sectional area is calculated as given in JIS B 1082. Checked against the table in the source (JIS B 1051:2014, Table 7).
  • The table covers only the 16 designations given in the source. A blank means that that property class is not specified for that size (property class 9.8 applies only up to 16 mm).
  • 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 1051, JIS B 0205-4, JIS B 1082
Bolts — Proof load — Proof load of bolts, fine thread | Updraft - Mechanical Engineering Calculators