BSE Ballnut: This is High Lead Type ballnut C7 Rolled and C3,C5 Ground Ballscrew are available. The model for BSE series Ballscrew included: 1616 ,1632 ,2020 ,2040 2525 , 2550 ,3232 ,3264 FBT Ballscrew Features: 1)High Reliability 2)High Precision 3)Smooth Movement 4)High Axial Stiffness 5)OEM/ODM Production.