Crown Rubber Casters:SY America's Crowned Tread 4 inch diameter by 2 inches wide Thermo Plastic Rubber wheels are extremely high quality non-marking gray thermo-plastic engineered rubber tread bonded to an industrial Polyolefin (plastic) core .These wheels are softer than a standard polyurethane wheel you would normally use.
High Load Capacity:These casters were designed with strength and sturdiness in mind for a long lifespan and easy movement of large, heavy loads. Each caster holds up to a maximum of 350 lbs. or 1400 lbs when purchasing a set of 4 casters.
Heavy Duty Accessories Design: Industrial caster wheel 4 inch diameter, 2 inch width, top plate: 4"x 4-1/2", caster overall height: 5-5/8", with ¾” roller bearing,and ½" ID spanner bushing with Zerk Axle .Galvanized thickened yoke has strong load-bearing capacity, so you can buy and use with confidence.
No-Marking & Silent Casters:With a 75 Shore A Durometer (Softness of Wheel); these are exclusively made to roll over debris, gaps, cracks, obstacles with ease. These gray soft rubber wheels are non-marring, nonmarking, quiet, absorb shock, vibrations, and protect equipment and floors and many floor surfaces.
Widely Used: Crowned thermoplastic grey rubber casters are commonly used in medical, laboratory, food service, and office equipment for their quiet, non-marking, and floor-protective properties.