: A precision fit for high-speed or high-torque applications. Position Letters : H : Standard for internal splines (hubs).
| Section | Description | |---------|-------------| | | Calculation of reference diameter, module, and profile shift | | Tooth geometry tables | Standardized combinations of module, teeth count, and diameters | | Tolerance classes | Fit classes for precise or general applications | | Inspection data | Over pin/ball measurements, span measurements over teeth | | Material allowances | Heat treatment and finishing allowances |
"W" (Welle) for external shaft; "N" (Nabe) for internal hub. Reference Diameter ( dBd sub cap B The nominal size, often matching a bearing bore. 3 The size of the teeth. 38 Number of Teeth ( Total count of teeth around the circumference. 8f Tolerance & Fit