M24 Grade 5.6 Torque Specification

Torque Values by Surface Condition

Stress area: 352.5 mm² · Proof load: 98,700 N · Clamp load (75%): 74,025 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	355.3	262.1	3144.7	3623.1
Oiled	0.15	266.5	196.6	2358.7	2717.6
Zinc Plated	0.18	319.8	235.9	2830.5	3261.1
Waxed	0.1	177.7	131.1	1572.8	1812.0
MoS₂	0.12	213.2	157.2	1887.0	2174.0
Galvanized	0.25	444.2	327.6	3931.5	4529.6

Stress area: 384.42 mm² · Proof load: 107,638 N · Clamp load (75%): 80,728 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	387.5	285.8	3429.7	3951.4
Oiled	0.15	290.6	214.3	2572.0	2963.3
Zinc Plated	0.18	348.7	257.2	3086.3	3555.8
Waxed	0.1	193.7	142.9	1714.4	1975.2
MoS₂	0.12	232.5	171.5	2057.8	2370.8
Galvanized	0.25	484.4	357.3	4287.3	4939.5

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 280 MPa × 352.5 mm² = 74,025 N

Step 2 — Torque (dry): T = 0.20 × 0.0240 m × 74,025 N = 355.3 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.

SizeM24

Class5.6

Diameter24 mm

Pitch (coarse)3.0 mm

Tensile500 MPa

Yield300 MPa

Proof280 MPa