Precision Ground Ball Screws

Precision Ground Ball Screws (SG Series) are the choice when high linear accuracy (i.e., grades C3 or C5) and smooth movement is required.   A precision grinding process is used to create the ball screw thread.  The drive side journal is machined ready for support bearing installation.  The finished screw is matched with a high quality ball nut to create the final assembly.

These products are very highly efficient (greater than 90%) in translating rotary to linear motion.

  • Very High Lead Accuracy: The grinding process enables lead accuracy specifications that are significantly higher than those achievable with other manufacturing methods. This is critical for applications where even a micron of error can be detrimental, such as in semiconductor manufacturing equipment, precision metrology instruments, and high-end optical systems.
  • Reduced Positional Error: The tight manufacturing tolerances directly translate to minimal positional error throughout the ball screw’s travel, ensuring consistent and precise movement.
  • Superior Rigidity: Precision grinding often results in a smoother and more consistent thread profile, contributing to higher overall assembly rigidity. This is important for resisting deflection under load and maintaining precision.
  • Lower Noise and Vibration: The superior surface finish and precise geometry of ground ball screws contribute to exceptionally smooth and quiet operation, minimizing unwanted vibrations that can affect delicate processes.

SG- Series Product Data

  • Screw Diameter ranging from  3.0 to 15.0 mm
  • Screw Lead (pitch): ranging from  0.5 to 20 mm
  • Screw Material:  High Alloy Steel or Stainless Steel
  • Screw Accuracy Grade:  C3 or C5
  • Axial Play: ranging from  0 to 5 microns
  • Ball Nuts:  Flanged (most popular), other types optional
  • Drive Side Machined ready for support bearings from factory
Ball Screw Part Number Nomenclature

The Accuracy Class is important if you wish to control backlash.  Backlash is the excess movement or free play of a nut on a screw in the axial direction without either component rotating.   It’s the axial free motion of the ball screw relative to the ball nut, commonly referred to as lost motion.  The amount of clearance between the very tiny ball bearing elements, screw raceway, and nut raceway are directly proportional to the amount of backlash.

C3 Accuracy Class has less backlash than C5 Accuracy Class.  Using spacer balls we reduce the backlash to almost zero.  Comparatively, the C5 accuracy class has about 0.005 mm (0.0002 inches) of backlash.

Pricing is typically in the range of $450 to $800 dollars each per ball screw assembly for orders of less than 10 pieces.

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