Threaded Rods - Loads in Imperial Units
Weight rating of threaded hanger rods.
Load capacities of threaded hanger rods are indicated below:
| Nominal Rod Diameter (in) | Root Area of Thread (in2) | Maximum Load 1) | |
|---|---|---|---|
| lb | kg | ||
| 3/8 | 0.07 | 600 | 270 |
| 1/2 | 0.13 | 1100 | 500 |
| 5/8 | 0.20 | 1800 | 820 |
| 3/4 | 0.30 | 2700 | 1220 |
| 7/8 | 0.42 | 3800 | 1720 |
| 1 | 0.55 | 4900 | 2220 |
| 1 1/8 | 0.69 | 6200 | 2810 |
| 1 1/4 | 0.89 | 8000 | 3630 |
| 1 1/2 | 1.29 | 11600 | 5260 |
| 1 3/4 | 1.74 | 14700 | 6670 |
| 2 | 2.30 | 20700 | 9390 |
| 2 1/4 | 3.02 | 27200 | 12340 |
| 2 1/2 | 3.72 | 33500 | 15200 |
| 3 | 5.62 | 50600 | 22960 |
| 3 1/4 | 6.72 | 60500 | 27440 |
| 3 1/2 | 7.92 | 71300 | 32340 |
| 4 | 10.6 | 95400 | 43270 |
| 4 1/2 | 13.7 | 123000 | 55780 |
| 5 | 17.2 | 154000 | 69900 |
1) The maximum loads in the table above are based on allowable tensile stress of 12 kpsi - reduced by 25% to 9 kpsi allowable stress.
- 1 kg = 9.81 N
- Threaded Rods - Proof Load Capacities in Metric Units
- Mass and Weight - the difference
Note that hangers supporting steam, water, air or gas piping systems should be able to carry the weight of piping, insulation, valves and other equipment - and water for hydrostatic pressure testing - without exceeding 80% of the supporting hangers yield strength (not exceeding 16 kpsi for steel of unknown properties)
Recommended Rod Sizes
Recommended rod sizes for individual pipes:
| Pipe Size (in) | Rod Size (in) |
|---|---|
| < 2 | 3/8 |
| 2 1/2 - 3 1/2 | 1/2 |
| 4 - 5 | 5/8 |
| 6 | 3/4 |
| 8 - 12 | 7/8 |
| 14 - 16 | 1 |
| 18 | 1 1/8 |
| 20 | 1 1/4 |
| 24 | 1 1/2 |
Rod diameter less than 3⁄8 in (12 mm) is not recommended as support.
