M14 Grade 5.6 Torque Specification

Torque Values by Surface Condition

Stress area: 115.44 mm² · Proof load: 32,323 N · Clamp load (75%): 24,242 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	67.9	50.1	601.0	692.4
Oiled	0.15	50.9	37.5	450.5	519.0
Zinc Plated	0.18	61.1	45.1	540.8	623.0
Waxed	0.1	33.9	25.0	300.0	345.7
MoS₂	0.12	40.7	30.0	360.2	415.0
Galvanized	0.25	84.8	62.5	750.5	864.7

Stress area: 124.55 mm² · Proof load: 34,874 N · Clamp load (75%): 26,156 N

Surface Condition	K Factor	N·m	ft·lbs	in·lbs	kgf·cm
Plain/Dry	0.2	73.2	54.0	647.9	746.4
Oiled	0.15	54.9	40.5	485.9	559.8
Zinc Plated	0.18	65.9	48.6	583.3	672.0
Waxed	0.1	36.6	27.0	323.9	373.2
MoS₂	0.12	43.9	32.4	388.5	447.7
Galvanized	0.25	91.5	67.5	809.8	933.0

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 280 MPa × 115.44 mm² = 24,242 N

Step 2 — Torque (dry): T = 0.20 × 0.0140 m × 24,242 N = 67.9 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.

SizeM14

Class5.6

Diameter14 mm

Pitch (coarse)2.0 mm

Tensile500 MPa

Yield300 MPa

Proof280 MPa