4" Rigid Caster | Polyurethane Tread Metal Wheel - 700 lbs Capacity

4" Rigid Caster | Polyurethane Tread Metal Wheel - 700 lbs Capacity 3/4" Roller Bearing with 1/2" Spanner Bushing included in Wheel as standard | Available Precision Ball Bearing Upgrade in the Options menu on the right side of the page Caster HQ's Polyurethane elastomer tread chemically bonded to cast iron core offers high weight capacities while providing good floor protection and a quiet rolling operation. Optional precision ball bearings require less effort to start up and maintain a rolling load; they also generate less friction heat and may prolong the life of the wheel. This Caster and Wheel Work well in indoor and outdoor environments; however, the cast iron core can rust with lots of exposure to wet environments; if this is an issue, consider using aluminum or plastic core wheels. CASTERHQ PART#: HQ2040R-PL1-PIR-REDTECHNICAL SPECIFICATIONS: Wheel Diameter: 4" Tread Width: 2" Tread Face: Flat Durometer: 95A (+/-5) Hub Length ( Width where Axle Goes Through ): 2-7/16" Maximum Capacity: 800 lbs each Wheel Bearing: 3/4" Roller Bearing Included or Upgraded to a Sealed precision using the options menu on the right-hand side Spanner: 1/2" Axle Diameter: 1/2" Color: Red Polyurethane on Silver Cast Iron Core