7/16" Grade 2 Torque Specification

Torque Values by Surface Condition

Stress area: 0.1063 in² · Proof load: 5,846 lbs · Clamp load (75%): 4,385 lbs

Surface Condition	K Factor	ft·lbs	N·m	in·lbs	kgf·cm
Plain/Dry	0.2	32.0	43.4	384.0	442.6
Oiled	0.15	24.0	32.5	288.0	331.4
Zinc Plated	0.18	28.8	39.0	345.6	397.7
Waxed	0.1	16.0	21.7	192.0	221.3
MoS₂	0.12	19.2	26.0	230.4	265.1
Galvanized	0.25	40.0	54.2	480.0	552.7

Stress area: 0.1187 in² · Proof load: 6,528 lbs · Clamp load (75%): 4,896 lbs

Surface Condition	K Factor	ft·lbs	N·m	in·lbs	kgf·cm
Plain/Dry	0.2	35.7	48.4	428.4	493.5
Oiled	0.15	26.8	36.3	321.6	370.2
Zinc Plated	0.18	32.1	43.5	385.2	443.6
Waxed	0.1	17.9	24.3	214.8	247.8
MoS₂	0.12	21.4	29.0	256.8	295.7
Galvanized	0.25	44.6	60.5	535.2	616.9

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 55,000 psi × 0.1063 in² = 4,385 lbs

Step 2 — Torque (dry): T = 0.20 × 0.4375 in × 4,385 lbs ÷ 12 = 32.0 ft·lbs

Proof stress per SAE J429 Table 3. Stress area per ASME B1.1. K-factor per VDI 2230.

General-purpose, non-critical bolting. Most common ungraded hardware-store bolts.

• Torque values are for standard hex bolts with unified threads per ASME B1.1. 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.
• Re-used bolts may have altered friction characteristics. Inspect threads before reuse.

Size7/16"

Grade2

Diameter0.4375" (11.11 mm)

TPI (UNC)14

Tensile74,000 psi

Yield57,000 psi

Proof55,000 psi