Double swivel castors with a pressed and galvanised sheet-steel fork, featuring double ball bearings. The tread is made of black, non-marking polyamide or grey, non-marking thermoplastic rubber (TPE). These castors have an axle bolt. The castors of the 321 series feature a wheel lock or total lock. Castors with a 50-mm diameter have a wheel lock. Castors with a larger diameter have a total lock. Both versions feature a brake pedal made of Zamak, a zinc alloy. These castors feature a thread guard and are available with a 50-mm or 75-mm diameter. Load capacity: 55-90 kg. Available with bolt hole, threaded stem and plate connection.

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