M10 Grade 5.8 Torque Specification

Torque Values by Surface Condition

Stress area: 58.0 mm² · Proof load: 22,040 N · Clamp load (75%): 16,530 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	33.1	24.4	293.0	337.5
Oiled	0.15	24.8	18.3	219.5	252.9
Zinc Plated	0.18	29.8	22.0	263.8	303.9
Waxed	0.1	16.5	12.2	146.0	168.3
MoS₂	0.12	19.8	14.6	175.2	201.9
Galvanized	0.25	41.3	30.5	365.5	421.1

Stress area: 61.2 mm² · Proof load: 23,256 N · Clamp load (75%): 17,442 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	34.9	25.7	308.9	355.9
Oiled	0.15	26.2	19.3	231.9	267.2
Zinc Plated	0.18	31.4	23.2	277.9	320.2
Waxed	0.1	17.4	12.8	154.0	177.4
MoS₂	0.12	20.9	15.4	185.0	213.1
Galvanized	0.25	43.6	32.2	385.9	444.6

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 380 MPa × 58.0 mm² = 16,530 N

Step 2 — Torque (dry): T = 0.20 × 0.0100 m × 16,530 N = 33.1 N·m

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

General industrial fastening, equipment mounting, moderate structural loads

• 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

Class5.8

Diameter10 mm

Pitch (coarse)1.5 mm

Tensile520 MPa

Yield420 MPa

Proof380 MPa