Track Roller System of Measurement Metric Shaft Diameter 70 mm Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Concentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size M70 x 6 Shaft Thread Length 74 mm Head Diameter 108 mm Head Length 35 mm Hex Drive Size 12.2 mm Overall Length 220 mm Standards AS 9100 ISO 9001