A spline sleeve, also known as an internal spline, is a mechanical connecting element that, through its mating with a splined shaft (external spline), achieves a stable connection between the shaft and a machine. Spline sleeves come in many types, and according to their shape and application, they can be classified into flat keys, semi-circular keys, diamond keys, trapezoidal keys, and many others. These different types of spline sleeves are suitable for various mechanical transmission requirements.
