M10 Grade 5.6 Torque Specification

Torque Values by Surface Condition

Stress area: 58.0 mm² · Proof load: 16,240 N · Clamp load (75%): 12,180 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	24.4	18.0	216.0	248.8
Oiled	0.15	18.3	13.5	162.0	186.6
Zinc Plated	0.18	21.9	16.2	193.8	223.3
Waxed	0.1	12.2	9.0	108.0	124.4
MoS₂	0.12	14.6	10.8	129.2	148.9
Galvanized	0.25	30.4	22.4	269.1	310.0

Stress area: 61.2 mm² · Proof load: 17,136 N · Clamp load (75%): 12,852 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	25.7	19.0	227.5	262.1
Oiled	0.15	19.3	14.2	170.8	196.8
Zinc Plated	0.18	23.1	17.0	204.5	235.6
Waxed	0.1	12.9	9.5	114.2	131.5
MoS₂	0.12	15.4	11.4	136.3	157.0
Galvanized	0.25	32.1	23.7	284.1	327.3

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 280 MPa × 58.0 mm² = 12,180 N

Step 2 — Torque (dry): T = 0.20 × 0.0100 m × 12,180 N = 24.4 N·m

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

Moderate-duty industrial applications, machinery guards, medium-strength connections

• 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

Class5.6

Diameter10 mm

Pitch (coarse)1.5 mm

Tensile500 MPa

Yield300 MPa

Proof280 MPa