小型十字万向联轴器的材料：WSD十字轴采用了合金钢（40Cr、40CrNi、20CrMo、20CrMnVB）制造，热处理后硬度58～62HRC，其他个零件均采用35或45钢制造并经热处理48～52 HRC 。
The two ends of the WSD coupling are connected in the form of: when the two ends use the same hole shape, there are cylindrical holes, cylindrical holes with keyways, and square holes; when the two ends use different hole shapes, there are cylindrical holes and cylindrical holes with keyways, and there are cylindrical holes. And square hole, cylindrical hole with keyway and square hole.
Small universal couplings are used to transmit motions that are not on the same axis. There are single type (WSD), double type (WS), retractable type (WSS), straightening machine (WHL, WSL); the material is 45# steel , 40Cr, stainless steel, etc.; the surface can be treated with blackening, nickel plating, galvanizing, etc.
