Skidmore Wilhelm Bolt Length Chart
Having the right bolt length for the job can make all the difference between a properly tensioned bolt and one susceptible to structural failure. Our minimum bolt-length chart is designed to give you an accurate depiction of necessary bolt lengths for your bolt tensioning applications.
Download and print out our bolt length chart to help you make the right decision.
The recommended bolt length in this document are offered as a guide only. Specification should be determined under actual assembly conditions due to the many variables involved.
| Stud Diameter (inches) | Stress Area | Nut Size (ATF) | Torque Values (FT-Lbs) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 40% Yield | 50% Yield | 60% Yield | |||||||||
| K=0.14 | K=0.18 | K=0.20 | K=0.14 | K=0.18 | K=0.20 | K=0.14 | K=0.18 | K=0.20 | |||
| #6 | 1/2 | ||||||||||
| #8 | 5/8 | ||||||||||
| #10 | 7/8 | 7/8 | |||||||||
| 1/4” | 7/8 | 1 | |||||||||
| 5/16” | 1 | 1-1/4 | 1-1/2 | ||||||||
| 3/8” | 1-1/2 | 1-3/4 | |||||||||
| 7/16” | 1-3/4 | 2 | |||||||||
| 1/2” | 2 | 2-1/4 | 1-3/4 | 1-1/2 | 2 | 1-1/4 | |||||
| 5/8” | 2-1/2 | 2 | 1-1/2 | 2-1/4 | 1-1/2 | ||||||
| 3/4” | 2-3/4 | 2 | 1-3/4 | 2-1/2 | 1-3/4 | ||||||
| 7/8” | 2-3/4 | 2-1/4 | 2 | 2-3/4 | 2 | ||||||
| 1” | 3 | 2-1/2 | 2-1/4 | 3 | 2-1/4 | 3-1/4 | 3 | 2-1/4 | |||
| 1-1/8” | 4-3/4 | 3-1/4 | 2-1/2 | 3-1/4 | 2-1/2 | 5-1/4 | 3-1/4 | 2-1/2 | |||
| 1-1/4” | 5 | 3-3/8 | 2-3/4 | 3-1/2 | 2-3/4 | 5-1/2 | 3-1/2 | 2-3/4 | 5-1/2 | ||
| 1-3/8” | 5-1/2 | 3-3/4 | 3-1/4 | 6 | |||||||
| 1-1/2” | 5-3/4 | 4 | 3-3/4 | 6-1/2 | |||||||
| 1-3/4” | 8 | ||||||||||
| 2” | 8 | ||||||||||
| 2-1/4” | 9 | ||||||||||
| 2-1/4” | 9-1/4 | ||||||||||
