SCARA Z-axis
Precision Ball Screw Splines
A ball screw spline machines both screw and spline grooves on the same shaft. By driving the screw nut and spline nut independently, one shaft delivers linear, rotary and spiral motion — the standard solution for SCARA Z-axes.
Φ16–Φ25 mm
Structure
Structure & Working Principle
- Crossed screw and spline grooves on one shaft
- Independent drive of screw nut and spline nut
- Linear, rotary and spiral motion modes
- Compact Z-θ axis with fewer parts
Series & Models
Ball Screw Splines Series
All catalog models (6)
| Model | Shaft d / OD D (mm) | C (N) | C₀ (N) | Details |
|---|---|---|---|---|
| UBNS1616 | 16 / 48 | 8400 | 13400 | View model → |
| UBNS2020 | 20 / 56 | 10500 | 18600 | View model → |
| UBNS2525 | 25 / 66 | 15900 | 26200 | View model → |
| UNS1616 | 16 / 31 | 6120 | 11200 | View model → |
| UNS2020 | 20 / 35 | 8900 | 16300 | View model → |
| UNS2525 | 25 / 42 | 12800 | 23200 | View model → |
Engineering
Before Selecting a Model
Shaft and housing envelope, nut retention / flange dimensions, shaft length, travel, radial load and load direction, torque, speed, duty cycle, accuracy, preload and lubricant/environment.
Downloads
Selection Guides
English PDF guides. Request configuration-specific drawings from engineering.
Request family engineering review →Applications
Where It Is Used
- SCARA robot Z-θ axis
- Pick-and-place with rotation
- Assembly robots
Customization
Custom Options
Shaft end machining, special lengths, hollow shafts and lubricant options require series-specific feasibility review.
FAQ
Frequently Asked Questions
Related
Other Product Families
Replacement
Looking for a replacement?
Send the original model and drawing for dimensional and performance evaluation. Engineering review precedes replacement approval.