MacInnes Carbide Axles are made of 3C tungsten carbide. The 3/16 inch long axle has a 45 degree chamfer on one end. The 1/4 thru 1/2 inch long axles have a chamfer on both ends.
| Axle Code | A316 | A250 | A516 | A380 | A500 |
| *Length (in. +0/-.005) | 0.175 | 0.245 | 0.31 | 0.37 | 0.495 |
| *Length (mm. +0/-.127) | 4.445 | 6.223 | 7.874 | 9.398 | 12.573 |
| **Diameter (in. +0/-.0004) | 0.0549 | 0.0549 | 0.0549 | 0.0549 | 0.0549 |
| **Diameter (mm. +0/-.01) | 1.39 | 1.39 | 1.39 | 1.39 | 1.39 |
* Other lengths are available upon request
** Carbide Axles are also available with outside diameter of .093