• Swivel load bearing - independent 5" dia. precision hardened thrust bearing unit keeps balls properly aligned and provides superior swiveling ability and long life; top plate skirt design protects bearing from contamination
• Secondary load bearing - 1 1/4" bore tapered roller bearing unit for perfect head alignment and superior swiveling
• Finished in matte black paint
• Top plate and fork base are drop forged steel; top plate is 3/4" thick 
• King pin: 1 1/4" dia. king bolt is integral with top plate, UNF threaded with slotted nut arrangement for fine adjustment of swivel movement
• Fork legs 3/8" thick, 3 1/2" wide steel, welded inside and out for extra strength
• Axle and wheel bearing - tapered roller bearings 1" dia. run directly on 1" dia. axle fitted with slotted nut for precise alignment of tapered bearings, roller bearing wheels 1-1/4" bore
• Fork leg spacing - 3 1/2" 
• Lubrication fittings in swivel and wheel
  OPTIONAL FEATURES: 
• 4-position swivel lock, factory installed
• Brake - factory-installed thumb screw type

Series 121 extra-heavy-duty drop forded casters are built for continuous and punishing service on heavy duty equipment with capacities up to 24,000 lbs. Well suited for the heaviest manually-operated loads, severe shock or abusive conditions, and power-driven and drag line equipment.