Source-gated engineering arithmetic
Nut Proof-Load Worksheet
Calculate proof force only from a proof stress and tensile stress area already verified for the exact nut style, property class, thread diameter and pitch. No ISO table values are guessed.
ISO 898-2:2022 scopeNo normative lookupNEEDS_LICENSED_SOURCE
Arithmetic result
Proof force Fp = Sp × As
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Verified proof stress
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Verified stress area
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Normative table lookup, nut/bolt matching, hardness, proof-test procedure and conformity are not assessed.
Arithmetic
Fp [N] = Sp [N/mm²] × As [mm²]
This is dimensional arithmetic, not an independent ISO conformity calculation. Sp and As must come from the same controlled basis.
Verified public scope of ISO 898-2:2022
- Current edition 4, published September 2022; ISO 898-2:2012 is withdrawn.
- Coarse-pitch ISO metric threads M5 to M39 and fine-pitch threads M8×1 to M39×3.
- Property classes 04, 05, 5, 6, 8, 10 and 12; nut styles 0, 1 and 2.
- Mechanical testing at 10 °C to 35 °C; service-temperature limitations require the standard and engineering review.
Removed unsafe data: the former M42–M64 claims are outside the published scope, and the code’s 0.94/0.90 proof-stress reductions were not standard table values. The simplified hardness and bolt-matching table is also removed.
Primary source
ISO 898-2:2022 official catalogue page. Exact proof-stress, hardness, compatibility and test rows remain NEEDS_LICENSED_SOURCE.
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