Does this worksheet reproduce ISO 898-2 proof-stress tables?

No. Current table values depend on property class, nut style, thread diameter and pitch. Enter values only after checking the exact licensed table row or a controlled product specification.

Can ISO 898-2:2022 be used for M64 nuts?

No. Its published scope covers coarse threads M5 to M39 and fine threads M8x1 to M39x3. A different controlling specification is required outside that scope.

Does calculated proof force establish conformity?

No. Multiplication of proof stress by stress area is arithmetic only. Nut conformity requires the specified product, dimensions, material, tests, marking and acceptance requirements.

Can a nut be matched to a bolt by comparing class digits only?

Not safely as a universal rule. Compatibility depends on the exact nut class/style/thread and bolt property class under the applicable standard and assembly requirements.

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

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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Current edition 4, published September 2022; ISO 898-2:2012 is withdrawn.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.

Nut Proof-Load Arithmetic Worksheet

ผลลัพธ์ทางคณิตศาสตร์

Arithmetic

Verified public scope of ISO 898-2:2022

Primary source

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