Track Roller System of Measurement Inch Shaft Diameter 5/8 in Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Eccentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size 5/8 In.-18 Shaft Thread Length 3/4 in Head Diameter 1 1/4 in Head Length 5/8 in Hex Drive Size 5/16 in Overall Length 3 11/16 in Standards AS 9100 ISO 9001