Track Roller System of Measurement Inch Shaft Diameter 3/4 in Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Concentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size 3/4 In.-16 Shaft Thread Length 1 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