Track Roller System of Measurement Inch Shaft Diameter 7/16 in Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Concentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size 7/16 In.-20 Shaft Thread Length 5/8 in Head Diameter 3/4 in Head Length 3/8 in Hex Drive Size 5/32 in Overall Length 2 1/16 in Standards AS 9100 ISO 9001