Key source specifications include Lubricant Output:
Stem: 7/8" x 2" Square Stem
The Ductile Steel wheel provides extreme weight capacity for its size
Follower 275183 Filler Socket 274712 Dimensions 20x12-1/4" (HxW)
Comparing wheel materials
6" x 2" Mold On Rubber Cast Swivel Caster w/ Top Lock Brake - 550 lbs. Cap. Mattress Carts Key source specifications include LubricantProduct Overview The mold on rubber cast wheel is an economic wheel, providing cushion while rolling on a strong cast iron core. This wheel performs best in dry applications. Tread: Rubber, Vulcanized To Core This caster is listed with wheel diameter 6", tread width 2", load capacity 550 Lbs., tread type Rubber, Vulcanized To Core, and bearing type Roller Bearing. Before ordering, verify the listed wheel dimensions, load capacity, bore or bearing, hub