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Threaded Rods - Loads in Imperial Units

Weight rating of threaded hanger rods.

Threaded hanger rod

Load capacities of threaded hanger rods are indicated below:

Threaded Rods - Maximum Loads - Imperial Units
Nominal Rod Diameter
(in)
Root Area of Thread
(in2)
Maximum Load 1)
lbkg
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.

Threaded steel rods - maximum load

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:

Recommended Rod Sizes
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.

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