Track Roller System of Measurement Inch Shaft Diameter 1 in Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Concentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size 1 In.-14 Shaft Thread Length 1 1/8 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