Welded steel heavy duty swivel castor, strong swivel head design, Heavy duty wheels made of cast nylonBracket: Particularly rugged welded steel construction, with axial grooved ball bearing DIN 711 and tapered roller bearing DIN 720 in the swivel head, dust and splash-proof, fitted grease nipple, bolted and secured with a welded very strong central kingpin. Bolted wheel axle. Zinc-plated, yellow-passivated, Cr6-free.Wheels: Tyre & running tread: Made of high-quality, impact-resistant cast nylon. Color: natural beige, Shore: 80° Shore DHigh chemical resistance to many aggressive substances. Operating temperature: -25° C to +80° C. At ambient temperatures above +35° C the load capacity is reduced. The relatively high floor pressure should be considered for pressure-sensitive floors. Maintenance-free under standard conditions.