Mechanical SpecificationsShaft Diameter: 3/8” (1/2”as special feature)Flat On Shaft: 3/8” Shaft: 0.80 long X 0.03” deep;1/2” Shaft: 0.80 long X 0.04” deep (1/2’’ shaft w/flat must beordered as special feature)Shaft Loading: 3/8” shaft: Up to 40 pounds axial and 35pounds radial; 1/2” shaft: Up to 90 pounds axial and 80 poundsradialShaft Runout: 0.0005 T.I.R. at midpoint regardless ofshaft diameterStarting Torque at 25°C: Without shaft seal 1.0 in-oz (max);With shaft seal 2.5 in-oz (max); 1/2” shaft with shaft seal:3.5 in-oz (max)Bearings: Class ABEC 7 standard, ABEC 5 for 1/2” shaftShaft Material: 416 stainless steelBearing Housing: Die cast aluminum with protective finish;stainless steel (special feature)Cover: Die cast aluminum; stainless steel (special feature)Bearing Life: 2 X 108 revs (1300 hrs at 2500 RPM)at rated load 1 X 1010 revs (67,000 hrs at 2500 RPM) at10% of rated load