_3 Designed for Super Precision Ground Ballscrew Assemblies JIS class 1 and 3 where the customer has access to an industrial laser to ensure the alignment.
_5 Designed for Precision Ground or Super Precision Rolled (MDL) JIS Class 5.
_7 Designed for Rolled Ballscrew Assemblies (our ISEL zero backlash or Hiwin backlash assemblies) and Trapezoidal.