M5 Grade 4.6 Torque Specification

Torque Values by Surface Condition

Stress area: 14.18 mm² · Proof load: 3,190 N · Clamp load (75%): 2,393 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	2.4	1.8	21.2	24.5
Oiled	0.15	1.8	1.3	15.9	18.4
Zinc Plated	0.18	2.2	1.6	19.5	22.4
Waxed	0.1	1.2	0.9	10.6	12.2
MoS₂	0.12	1.4	1.0	12.4	14.3
Galvanized	0.25	3.0	2.2	26.6	30.6

Stress area: 16.13 mm² · Proof load: 3,629 N · Clamp load (75%): 2,722 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	2.7	2.0	23.9	27.5
Oiled	0.15	2.0	1.5	17.7	20.4
Zinc Plated	0.18	2.4	1.8	21.2	24.5
Waxed	0.1	1.4	1.0	12.4	14.3
MoS₂	0.12	1.6	1.2	14.2	16.3
Galvanized	0.25	3.4	2.5	30.1	34.7

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 225 MPa × 14.18 mm² = 2,393 N

Step 2 — Torque (dry): T = 0.20 × 0.0050 m × 2,393 N = 2.4 N·m

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

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.

SizeM5

Class4.6

Diameter5 mm

Pitch (coarse)0.8 mm

Tensile400 MPa

Yield240 MPa

Proof225 MPa