Plain Linear Bearing - FMC50 50mm Compensated RST but the TWN blocks are

but the TWN blocks are twice thee size

Double Plain Linear Bearing with a 1/2" ID inside a square flanged housing

and oscillating motion in harsh environments where ball bearings often fail

Vibration Damping: Ensures smooth and quiet operation

0005" running clearance per side

Plain Linear Bearing - FMC50 50mm Compensated RST but the TWN blocks arePlain linear bearing, closed, with a 50mm compensated ID that provides a 0. 0015" running clearance per side on round shafts. Encased in a standard cylindrical anodized aluminum shell, this bearing features a bonded Simplicity self lubricating FrelonGOLD bore liner for maintenance free linear, rotating and oscillating motion in harsh environments such as extreme temperatures, dirt, welding splatter, vibration, shock loads, contamination, washdowns, or