M5 Grade 5.6 Torque Specification

Torque Values by Surface Condition

Stress area: 14.18 mm² · Proof load: 3,970 N · Clamp load (75%): 2,978 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	3.0	2.2	26.6	30.6
Oiled	0.15	2.2	1.6	19.5	22.4
Zinc Plated	0.18	2.7	2.0	23.9	27.5
Waxed	0.1	1.5	1.1	13.3	15.3
MoS₂	0.12	1.8	1.3	15.9	18.4
Galvanized	0.25	3.7	2.7	32.7	37.7

Stress area: 16.13 mm² · Proof load: 4,516 N · Clamp load (75%): 3,387 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	3.4	2.5	30.1	34.7
Oiled	0.15	2.5	1.8	22.1	25.5
Zinc Plated	0.18	3.0	2.2	26.6	30.6
Waxed	0.1	1.7	1.3	15.0	17.3
MoS₂	0.12	2.0	1.5	17.7	20.4
Galvanized	0.25	4.2	3.1	37.2	42.8

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 280 MPa × 14.18 mm² = 2,978 N

Step 2 — Torque (dry): T = 0.20 × 0.0050 m × 2,978 N = 3.0 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.

SizeM5

Class5.6

Diameter5 mm

Pitch (coarse)0.8 mm

Tensile500 MPa

Yield300 MPa

Proof280 MPa