| Thread Diameter | Friction Coefficient | Tightening Torque M (Nm) Property Class | |||
|---|---|---|---|---|---|
| 50 | 70 | 80 | Bumax 88 | ||
| 1/4-20 unc | 1.6 | 3.6 | 7.7 | 10 | 11 |
| 5/16-18 unc | 1.6 | 7.3 | 16.0 | 21 | 22 |
| 3/8-16 unc | 1.6 | 13.0 | 28.0 | 37 | 39 |
| 1/2-13 unc | 1.6 | 31.0 | 66.0 | 89 | 95 |
| 5/8-11 unc | 1.6 | 61.0 | 131.0 | 175 | 188 |
| 3/4-10 unc | 1.6 | 108.0 | 231.0 | 308 | 329 |
| 7/8-9 unc | 1.6 | 172.0 | 369.0 | 493 | 527 |
| 1-8 unc | 1.6 | 258.0 | 553.0 | 737 | 789 |
The friction values can vary depending on many factors: material pairing, the surface quality (peak to valley heights), the surface treatment and the type of lubrication. Therefore this information is only meant as a guide
Note: Stainless steel fasteners tend to seize whilst being assembled (tightened). The risk of seizing is alleviated by:
Impact wrenches are not recommended for torquing 300 series stainless steel fasteners.
The tightening torques as stated above result in a 90% utilization of the yield strength.
Conversion Factor:
 |
|
|---|---|
| Tensile Strength Comparison Chart | What is loading? |
Are you sick of cutting your bolts down?
How to install Stainless Down Pipe Brackets
Calculate the corrosion resistance of your stainless steel with our PREN calculator
To receive useful info and product updates add your details below
Request a hardcopy of our product wall chart or download a PDF.
Download a PDF of our paper based catalogue.
