1" (Light Duty)
Residential, light commercial
Max WeightUp to 150 lbs
Inside Width1"
Gauge22 ga
Radius12"
2" (Standard Duty)
Residential, standard commercial
Max Weight150–400 lbs
Inside Width2"
Gauge20 ga
Radius12" or 15"
2" (Heavy Duty)
Commercial, industrial
Max Weight400–600 lbs
Inside Width2"
Gauge16 ga
Radius12", 15", or 20"
3" (Commercial)
Large commercial, industrial
Max Weight600–1,000 lbs
Inside Width3"
Gauge14 ga
Radius15", 20", or 27"
3" (Heavy Commercial)
Heavy industrial, high-cycle
Max Weight1,000+ lbs
Inside Width3"
Gauge12 ga
Radius20" or 27"