Metric torque chart (ISO 898-1)

99 sizes · ThreadRef · free sample of 8 representative sizes

Metric torque chart (ISO 898-1). Target preload and estimated tightening torque for property classes 8.8, 10.9 and 12.9 across every metric coarse and fine size - with the sizes ISO 898-1 does not cover marked as such rather than filled in.
Size	Stress area mm²	8.8 preload kN	8.8 torque N·m	10.9 preload kN	10.9 torque N·m	12.9 preload kN	12.9 torque N·m
Metric coarse
M6 × 1.0	20.1	8.75	11	12.53	15	14.64	18
M8 × 1.25	36.6	15.92	26	22.79	37	26.63	43
M10 × 1.5	58	25.23	51	36.1	72	42.19	84
M12 × 1.75	84.3	36.66	88	52.46	126	61.3	147
M16 × 2.0	156.7	68.15	218	97.53	312	114	365
M20 × 2.5	244.8	110	441	152	610	178	712
Metric fine
M10 × 1.25	61.2	26.62	53	38.1	76	44.52	89
M12 × 1.5	88.1	38.33	92	54.86	132	64.11	154

Proof loads per ISO 898-1:2013, which bands class 8.8 by diameter. Preload is 75% of proof load; torque is the T = K · F · d estimate at K = 0.20 (dry / as-received steel).

Torque figures are estimates that depend on the stated nut-factor assumption. Verify against your fastener manufacturer's data and joint requirements before assembly.

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