External Retaining Ring Carbon Steel Black Phosphate For Shaft Dia 1/2 In Free ID 0.461 In Thickness 0.035 In Thickness Tolerance +/-0.002 In Fits Groove Dia 0.468 In Groove Dia Tolerance +/-0.002 In Fits Groove Width 0.039 In Groove Width Tolerance +0.003 In Fits Groove Depth 0.016 In Clearance Dia Expanded 0.77 In Clearance Dia Released 0.740 In Hole Dia 0.047 In Meets ASME Rockwell Hardness RC47-53 Tensile Strength 120 000 PSI Package 50