3S, 3R-Spring Loaded Medium Heavy Duty Series
- Die cast springs, total compression at 400LB with a spring travel of 7/8"
- The compression range can be adjusted by changing springs
- 2-9/16" bearing raceway is precisely machined and hardened, 3/8" hardened ball bearings
- Lower raceway thrust bearing is a tapered roller bearing, providing exceptionally smooth and easy swiveling action and counteracts radial thrust
- 3/4" integrally forged kingpin
- Zinc-plated finish
- 1/2" axle