9/16" Grade 5 Torque Specification

Torque Values by Surface Condition

Stress area: 0.182 in² · Proof load: 15,470 lbs · Clamp load (75%): 11,602 lbs

Surface Condition	K Factor	ft·lbs	N·m	in·lbs	kgf·cm
Plain/Dry	0.2	108.8	147.5	1305.6	1504.1
Oiled	0.15	81.6	110.6	979.2	1127.8
Zinc Plated	0.18	97.9	132.7	1174.8	1353.2
Waxed	0.1	54.4	73.8	652.8	752.6
MoS₂	0.12	65.3	88.5	783.6	902.5
Galvanized	0.25	136.0	184.4	1632.0	1880.4

Stress area: 0.203 in² · Proof load: 17,255 lbs · Clamp load (75%): 12,941 lbs

Surface Condition	K Factor	ft·lbs	N·m	in·lbs	kgf·cm
Plain/Dry	0.2	121.3	164.5	1455.6	1677.4
Oiled	0.15	91.0	123.4	1092.0	1258.3
Zinc Plated	0.18	109.2	148.1	1310.4	1510.2
Waxed	0.1	60.7	82.3	728.4	839.2
MoS₂	0.12	72.8	98.7	873.6	1006.5
Galvanized	0.25	151.7	205.7	1820.4	2097.6

Formula: T = K × D × F

Step 1 — Clamp load: F = 0.75 × 85,000 psi × 0.182 in² = 11,602 lbs

Step 2 — Torque (dry): T = 0.20 × 0.5625 in × 11,602 lbs ÷ 12 = 108.8 ft·lbs

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

Automotive, agricultural equipment, general machinery — the most common high-strength SAE grade. Equivalent to ISO 8.8.

• 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.

Size9/16"

Grade5

Diameter0.5625" (14.29 mm)

TPI (UNC)12

Tensile120,000 psi

Yield92,000 psi

Proof85,000 psi