M10 Grade 4.6 Torque Specification

Torque Values by Surface Condition

Stress area: 58.0 mm² · Proof load: 13,050 N · Clamp load (75%): 9,788 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	19.6	14.5	173.5	199.9
Oiled	0.15	14.7	10.8	130.1	149.9
Zinc Plated	0.18	17.6	13.0	155.8	179.5
Waxed	0.1	9.8	7.2	86.7	99.9
MoS₂	0.12	11.7	8.6	103.6	119.3
Galvanized	0.25	24.5	18.1	216.8	249.8

Stress area: 61.2 mm² · Proof load: 13,770 N · Clamp load (75%): 10,328 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	20.7	15.3	183.2	211.1
Oiled	0.15	15.5	11.4	137.2	158.1
Zinc Plated	0.18	18.6	13.7	164.6	189.7
Waxed	0.1	10.3	7.6	91.2	105.0
MoS₂	0.12	12.4	9.1	109.7	126.4
Galvanized	0.25	25.8	19.0	228.3	263.1

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 225 MPa × 58.0 mm² = 9,788 N

Step 2 — Torque (dry): T = 0.20 × 0.0100 m × 9,788 N = 19.6 N·m

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

Non-critical assemblies, light-duty applications, general-purpose hardware where high strength is not required

• 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

Class4.6

Diameter10 mm

Pitch (coarse)1.5 mm

Tensile400 MPa

Yield240 MPa

Proof225 MPa