Standard style (SC) shaft collars use a hardened set screw to penetrate the shaft so as to achieve gripThis penetration yeilds light-duty benefits for applications like thrust collars, abor spacers, sprockets hubs, bearing holders, and shaft protectorsSC collars do not work well when th shaft is harder than set screw or when penetration marks on the shaft are not desirableBlack oxide coating will slightly increase friction and holding power in some applicationsFinish: Zinc Inside Diameter: 1-3/4 Inch Inside Diameter Maximum: 1.7560 Inch Inside Diameter Minimum: 1.7510 Inch Item: Shaft Collar Material: Low Carbon Steel Measurement: Inch Origin: Imported Outside Diameter: 2-3/4 Inch Outside Diameter Maximum: 2.7580 Inch Outside Diameter Minimum: 2.7420 Inch Set Screw Size: 1/2-13 Style: Solid Set Thickness: 7/8 Inch Thickness Maximum: 0.8800 Inch Thickness Minimum: 0.8700 Inch Type: Round Bore 
