Track Roller System of Measurement Metric Shaft Diameter 25 mm Shaft Material Alloy Steel Shaft Material Grade 52100 Shaft Type Concentric Drive Type Hex Socket Drive Location Stud Shaft Thread Size M24 x 1.5 Shaft Thread Length 29 mm Head Diameter 44.5 mm Head Length 19 mm Hex Drive Size 8 mm Overall Length 110 mm Standards AS 9100 ISO 9001