Linear Ball Bearing Type Closed Inside Dia 1/4 in Outside Dia 1/2 in Material Delrin Accelerated Speed 450 fps Between Grooves (mm) 0.511 in Dimension C 0.75 in Dimension C1 0.511 in Dimension T 0.25 Dynamic Load Capacity (N) 60 lbf For Use With Thomson Shafting Inside Dia Tolerance +/-0.001 Maximum Operating Temperature 185 Degrees F Minimum Operating Temperature 0 Degrees F Length (In.) 3/4 in Seal -