Axle size is 15.75-inch x 0.5-inch.
Includes two 8-inch semi-pneumatic wheels with welded steel hubs and dual ball bearings, and plated axle with clips and washers.75-inch.| Justrite Replacement 8" Semi-Pneumatic Wheels and Axle Set for Gas Cylinder Hand Trucks, Steel, 35372 Justrite Replacement 8" Semi-Pneumatic Wheels and Axle Set for Gas Cylinder Hand Trucks, Steel, 35372 Wheels are 8-inch x 1.