Splines are available for a variety of specialty purposes.
Used on most original equipment applications and will generally allow for a useable stroke of 3". Can be used in all tube diameters and is the lowest priced.
Very similar to the ( S ) Standard Spline, but is 1" longer to allow for a useable stroke of about 4". Can be used on 2", 2.5", 2.75". 3" & 3.5" diameter tubes.
Advantages is a longer stroke than the ( S ) Standard Spline. The splines are cut for the full length of the stub. This yields more contact area between the slip yoke & spline stub that will net a longer life. Useable stroke is 4.5". The XC comes with a dust cap and the XB comes with a boot. The XC can be used on 1.25" & 2" diameter tubes. The XB can be used on 2" diameter tubes.
Specifically designed for applications such as shackle reversals in conjunction with revolver shackles or buggy springs. The U1 has a useable stroke of 8" and the U2 has a useable stroke up to 19". NOT RECOMMENDED FOR HIGH-SPEED USE. Can be used in all tube diameters but is most suitable for 2" diameter tubes.