Listing is for a set of four (4) Service Caster Series #92 casters with 8″ diameter, 3″ wide semi steel cast iron wheels. Set includes four (4) swivel casters, two (2) fitted with side locking brakes. Supports 10000 total pounds (lbs) at 2500 pounds (lbs) per caster. 8 Inch Heavy Duty Semi Steel Cast Iron Wheel Swivel Caster Set with 2 Brakes. When searching for a reliable and durable solution for extra heavy duty projects in high temperatures, consider Service Caster’s Series 92 top plate semi-steel cast iron casters. Semi-steel cast iron provides a long lasting, high capacity wheel capable of easy rolling under heavy loads. These cast iron based wheels feature a machined hub and wheel face. An economic choice over steel, semi-steel wheels are abrasion resistant and rugged while also having the capability to perform in temperatures up to 600 degrees Fahrenheit. Featuring a Kingpinless hot forged ASTM1045 steel design that increases caster durability and integrity, the series 92 eliminates problems associated with kingpin failure due to severe shock loading. In addition, the Kingpinless design features ½ diameter HRC45 steel ball bearings which absorb thrust and load in severe environments. Lastly, Service Caster’s Series #92 top plate casters are finely crafted with zinc plating, grease fittings, and 4 position notches to accept 4-position locks. Even drywall carts, welding carts, and wall panel carts will be ready to roll on the Series 92, keeping you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward. The Kingpinless Series 92 semi-steel cast iron casters come in these wheel sizes and mounting heights – 6″ wheel (8″ mounting height), 8″ wheel (10-1/2″ mounting height), 10″ wheel (12-1/2″ mounting height) and 12″ wheel (15-1/2″ mounting height). Machine hubbed, providing a long lasting, high capacity wheel capable of easy rolling under heavy loads. Less expensive than steel, semi-steel is abrasion resistant, rugged and performs in temperatures up to 600 degrees Fahrenheit. Weight capacity ranges from 2000 lbs on the 6″ caster, 2500 lbs on the 8″, 3000 lbs on the 10 and 3500 lbs. Top plate measures at 5-1/4″ x 7-1/4″ with a bolt hole pattern of 3-3/8″ x 5-1/4″ to 4-1/8″ x 6-1/8″ and can either be bolted or welded on. Brake options include a side lock brake (SLB) which applies a positive locking force against the wheel hub which prevents the wheel from moving freely, or a bolt-on swivel lock (BSL) that when inserted into one of 4 notches found on the swivel raceway converts a swivel caster to rigid for straight-line tracking at any 90 degree angle. Combining both brake types ensures complete immobility over both swivel and wheel on the caster. Find other wheel materials, sizes and all Service Caster products at our Amazon Storefront. Since its incorporation in 1993, Service Caster Corporation has become one of the largest caster and wheel companies in North America. We design, manufacture, assemble, and distribute casters worldwide from our location in West Reading, Pennsylvania. The Service Caster sales staff has over 100 years combined experience. We take pride in every product we make and will stand by you- our customer- every step of the way. Trust us to assist you with selecting, designing, and integrating casters into your application. Choose from a wide range of casters and wheels designed for light to extra heavy duty use from our extensive catalog of over 200 brands, including the Service Caster brand.