Metric torque chart (ISO 898-1)

99 sizes · ThreadRef · sample of the first 8 rows

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
M1 × 0.25¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
M1.2 × 0.25¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
M1.4 × 0.3¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
M1.6 × 0.35	1.3	0.55	0.2	0.79	0.3	0.92	0.3
M1.8 × 0.35	1.7	0.74	0.3	1.06	0.4	1.24	0.5
M2 × 0.4	2.1	0.9	0.4	1.29	0.5	1.51	0.6
M2.5 × 0.45	3.4	1.47	0.7	2.11	1.1	2.47	1.2
M3 × 0.5	5	2.19	1.3	3.13	1.9	3.66	2.2

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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