Inner Ring Bore Diameter 3/4 in Compatible Bearing Grainger Part Number 35TW79 35TW80 779K41 Compatible Bearing Manufacturer Part Number 166 167 1671 168 1681 Outside Diameter 1 in Overall Width 0.515 in Ring Material Alloy Steel System of Measurement Inch Bore Diameter Tolerance +0/-0.0005 in Lubrication Openings None Outside Diameter Tolerance +0/-0.0005 in Ring Material Grade Su2