Nippon Labs CC-BK4 4 inch caster wheels 300 lbs (pack of 4)

4-inch PVC caster wheels

Nippon Labs CC-BK4 wheels replace standard office-chair casters with 100 mm PVC tyres on steel brackets. Each wheel carries 300 lbs and uses double ball bearings for smooth, quiet rolling. The pack supplies four wheels, sixteen screws, sixteen nuts and two spanners.

Suits chairs with 64 x 94 mm plates

These casters fit mounting plates measuring 64 by 94 mm with holes spaced 44 by 74 mm and 8 to 12 mm diameter. Two wheels include brakes, two swivel freely through 360 degrees. Buyers whose furniture uses stem mounts or different bolt patterns cannot use this set.

64 x 94 mm plate with 44 x 74 mm hole spacing

The decisive specification is the top-plate geometry: 64 x 94 mm overall with holes centred 44 mm by 74 mm apart and 8 to 12 mm wide. Measure the existing plate before ordering; a mismatch means the wheels will not bolt on.