M10 Grade 12.9 Torque Specification

Torque Values by Surface Condition

Stress area: 58.0 mm² · Proof load: 56,260 N · Clamp load (75%): 42,195 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	84.4	62.3	747.0	860.6
Oiled	0.15	63.3	46.7	560.3	645.5
Zinc Plated	0.18	76.0	56.1	672.7	775.0
Waxed	0.1	42.2	31.1	373.5	430.3
MoS₂	0.12	50.6	37.3	447.8	516.0
Galvanized	0.25	105.5	77.8	933.8	1075.8

Stress area: 61.2 mm² · Proof load: 59,364 N · Clamp load (75%): 44,523 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	89.0	65.6	787.7	907.6
Oiled	0.15	66.8	49.3	591.2	681.2
Zinc Plated	0.18	80.1	59.1	708.9	816.8
Waxed	0.1	44.5	32.8	393.9	453.8
MoS₂	0.12	53.4	39.4	472.6	544.5
Galvanized	0.25	111.3	82.1	985.1	1134.9

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 970 MPa × 58.0 mm² = 42,195 N

Step 2 — Torque (dry): T = 0.20 × 0.0100 m × 42,195 N = 84.4 N·m

Proof stress per ISO 898-1:2013 Table 4. Stress area per ISO 898-1 Annex A. K-factor per VDI 2230.

Socket head cap screws, racing/motorsport, aerospace, maximum strength applications — highest standard grade

• Torque values are for standard hex bolts with ISO metric threads. Socket head cap screws may have different requirements.
• Lubrication reduces required torque significantly — using dry torque values on lubricated bolts risks exceeding yield strength.
• For critical or safety-related applications, always consult the manufacturer's specifications or applicable design standard (e.g., VDI 2230).
• Re-used bolts may have altered friction characteristics. Inspect threads before reuse.

SizeM10

Class12.9

Diameter10 mm

Pitch (coarse)1.5 mm

Tensile1220 MPa

Yield1100 MPa

Proof970 MPa