# 7/16 inch bolt torque

Tighten a 7/16-14 UNC grade 5 bolt to 49 ft-lb (67 N·m) with dry threads, or 37 ft-lb when lubricated. Grade 8 takes 70 ft-lb and grade 2 takes 32 ft-lb.

## 7/16 torque by thread series and SAE grade

| Thread | Grade | Dry torque (K 0.20) | Lubricated (K 0.15) | Clamp load |
|---|---|---|---|---|
| 7/16-14 UNC | Grade 2 | 32 ft-lb (43 N·m) | 24 ft-lb | 4,385 lbf |
| 7/16-14 UNC | Grade 5 | 49 ft-lb (67 N·m) | 37 ft-lb | 6,777 lbf |
| 7/16-14 UNC | Grade 8 | 70 ft-lb (95 N·m) | 52 ft-lb | 9,568 lbf |
| 7/16-20 UNF | Grade 2 | 36 ft-lb (48 N·m) | 27 ft-lb | 4,897 lbf |
| 7/16-20 UNF | Grade 5 | 55 ft-lb (75 N·m) | 41 ft-lb | 7,568 lbf |
| 7/16-20 UNF | Grade 8 | 78 ft-lb (106 N·m) | 58 ft-lb | 10,684 lbf |

Clamp load = 75 % of proof load. Method: T = K × F × d.

## 7/16 bolt data

- Threads: 7/16-14 UNC, 7/16-20 UNF
- Wrench: 5/8 in
- Tap drill: U (0.3680 in) for UNC, 25/64 (0.3906 in) for UNF

## Method

Proof strength from SAE J429 × tensile stress area As = 0.7854 × (D − 0.9743/n)² (ASME B1.1). F = 75 % of proof load. T = K × F × D with K = 0.20 dry, 0.15 lubricated.

## FAQ

**What is the torque for a 7/16 grade 5 bolt?**
About 49 ft-lb dry for 7/16-14 UNC and 55 ft-lb for 7/16-20 UNF, based on 75 % of proof load.

**What is the torque for a 7/16 grade 8 bolt?**
About 70 ft-lb dry for 7/16-14 UNC and 78 ft-lb for 7/16-20 UNF.

**What is the torque for a 7/16 grade 2 bolt?**
About 32 ft-lb dry for 7/16-14 UNC.

**What size wrench fits a 7/16 bolt?**
A standard 7/16" hex cap screw takes a 5/8" wrench or socket.

Source page: https://machinistcharts.com/bolt-torque/7-16-inch/
Updated: 2026-10-05
Publisher: MachinistCharts (https://machinistcharts.com)