Metric Torque Guide — 8.8, 10.9, 12.9
Starting-point tightening torques for metric coarse-pitch hex bolts and screws, calculated from ISO 898-1 proof loads. Use them only when no manufacturer torque is given.
Estimated torque, N·m (K = 0.20, clamp load = 75% of proof)
| Size | 8.8 | 10.9 | 12.9 |
|---|---|---|---|
| M5 x 0.8 | 6 | 9 | 10 |
| M6 x 1 | 11 | 15 | 18 |
| M8 x 1.25 | 25 | 36 | 43 |
| M10 x 1.5 | 50 | 72 | 84 |
| M12 x 1.75 | 88 | 125 | 145 |
| M14 x 2 | 140 | 200 | 235 |
| M16 x 2 | 220 | 310 | 365 |
| M20 x 2.5 | 440 | 610 | 710 |
| M24 x 3 | 760 | 1,055 | 1,230 |
| M30 x 3.5 | 1,515 | 2,095 | 2,445 |
| M36 x 4 | 2,645 | 3,660 | 4,280 |
Method: T = K x d x F, F = 0.75 x proof load. K = 0.20 = plain or zinc-plated steel, dry. Lubricated (K about 0.15): multiply by 0.75. Values rounded.
These tables carry the same figures as the printed sheet below.
The printed sheet
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Text version of this sheet
Estimated assembly torque · metric coarse thread · ISO 898-1 classes
What it is
FIELD IDENTIFICATION
Starting-point tightening torques for metric coarse-pitch hex bolts and screws, calculated from ISO
898-1 proof loads. Use them only when no manufacturer torque is given.
MFG
8.8/10.9/12.9
Torque values are for stated conditions only
Estimated torque, N·m (K = 0.20, clamp load = 75% of proof)
Size
8.8
10.9
12.9
M5 x 0.8
6
9
10
M6 x 1
11
15
18
M8 x 1.25
25
36
43
M10 x 1.5
50
72
84
M12 x 1.75
88
125
145
M14 x 2
140
200
235
M16 x 2
220
310
365
M20 x 2.5
440
610
710
M24 x 3
760
1,055
1,230
M30 x 3.5
1,515
2,095
2,445
M36 x 4
2,645
3,660
4,280
Method: T = K x d x F, F = 0.75 x proof load. K = 0.20 = plain or zinc-plated steel, dry. Lubricated (K about 0.15): multiply by 0.75. Values rounded.
Key points
Fine-pitch threads have a larger stress area and need their own values.
Pair with the correct nut class (8 for 8.8, 10 for 10.9, 12 for 12.9).
Governing standards: ISO 898-1:2013 (proof stress); ISO 898-2:2022 (nuts). Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard
always take precedence over this sheet.
torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability
arising from reliance on this reference.
Fastener Guide reference FG-E0972C · thefastenerapp.com/fastener-guide/technical-reference/metric-torque-guide-8-8-10-9-12-9 · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
