Track Roller System of Measurement Inch Shaft Diameter 7/8 in Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Eccentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size 7/8 In.-14 Shaft Thread Length 3/4 in Head Diameter 1 3/4 in Head Length 3/4 in Hex Drive Size 1/2 in Overall Length 4 5/16 in Standards AS 9100 ISO 9001