Medium-Duty Stainless Steel Casters and Wheels are wash down friendly. All metal parts are made of high quality 304 stainless steel. Double ball raceways and 5/8" nut and bolt kingpin are standard. 1/2" stainless axle and lock nut. 4" x 4-1/2" plates, 2-5/8" x 3-5/8" to 3" x 3" bolt pattern. Mounting bolt diameter 3/8". 4", 5", 6", 8" wheel diameter x 2" tread width. Stainless roller, precision ball bearings, delrin bearings available. Zerk grease fittings in raceway and axle for easy maintenance. Options available: Top-Lock Brake, Raceway Seal, 4-Position Lock. NSF listed. The stainless steel casters have a large selection of wash down friendly wheels, bearings & brake options. The wheel options listed below are some of the most popular for stainless steel casters. The NM Nomadic wheel option provides a soft tread, smooth rolling thermo plastic elastomer rubber wheel that is non marking and offers floor protection and cushioned ride. Resistant to chemicals, acids, alcohols, water and excellent with the stainless casters for hospital or pharmaceutical applications. The stainless casters with the PH phenolic wheel option has stainless steel roller bearings and provides high capacity and economical option. The NY nylon wheel stainless caster is a solid wheel with plastic delrin bearing and with a slight crown allowing easy swivel action and rollability with good capacity and is 100% washable and steam cleanable. Highly resistant to organic solvents, most chemicals and cleaners and water. Great for food processing, and meat packaging or produce facilities when installed in a stainless caster. The MA Maxrok wheel is injection molded and made of 30% glass filled nylon wheel with stainless steel precision ball bearings. This wheel offers excellent weight capacity and is 100% washable and steam cleanable and resistant to grease, oils, most chemicals, cleaners, salt, brine, and blood. Resistant to abrasion and compression. Slight crown tread allows ergonomic rolling and swivel action. Also good for high temp applications with a temperature range of -45 to 350 degrees F with stainless roller bearings and high temp grease. The HU Ergolastomer wheel is a super strength solid cast polyurethane elastomer wheel. Provides unmatched strength and resistant to chemical and cleaners and 100%washable. Precision stainless steel ball bearings allow smooth ergonomic rolling and swivel action with slight crown tread. These stainless steel casters can be used in almost any application requiring high capacity such as pharmaceutical vats, animal carts, food processing tow carts, meat packing waste carts, chicken processing plant buggies, restaurants kitchen equipment, nursery carts and trucks & many other extreme duty stainless caster applications. Rubber on aluminum wheels available too.