FSR Type Series
FSR Type Linear Ball Spline, Rotary Nut
- Nut Type
- Rotary (FSR)
- Shaft Diameter
- 16 - 32 mm
- Accuracy Grades
- C, H, P
- Dynamic Load Rating
- 7.2 [kN] - 20.5 [kN]
The FSR Series Ball Splines are designed for linear and rotary motion, featuring a flanged ball nut for easy housing installation, efficient torque transmission, and an optimized lubricating channel and retainer design.
When the axis also needs helical motion, the FBR compound type stacks a ball-screw nut beside the spline nut on one shaft. View FBR Type →
-
181.5 N·m
Dynamic torque rating CT at Ø32
-
13.7 kN
Support bearing dynamic rating at Ø32
-
18 µm
P-grade outer ring runout, all sizes
Applications
- Industrial robot arms
- Automatic loading and unloading machines
- Drilling and EDM main shafts
- Automatic tool table indexing shafts
- Winding and welding machines
- Construction vehicle steering shafts
Sizes
FSR is the rotary member of the spline family and starts at 16 mm: four shaft sizes against the five that RS and FS cover (the 13 mm core is cylinder and flange only). Spline load and torque ratings carry across nut types; the FSR table adds support bearing ratings for the outer ring.
| Model | Shaft Ø (mm) | Dynamic load C (kN) | Dynamic torque CT (N·m) | Configure |
|---|---|---|---|---|
| SP-16-FSR | 16 | 7.2 | 32.1 | Configure ↗ |
| SP-20-FSR | 20 | 10.4 | 57.8 | Configure ↗ |
| SP-25-FSR | 25 | 15.4 | 106.5 | Configure ↗ |
| SP-32-FSR | 32 | 20.5 | 181.5 | Configure ↗ |
Part numbers & options
How a part number reads
SP - 20 - 2 FSR - 400 - 500 - C - S
- SP
- Ball spline product family
- 20
- Spline shaft outer diameter (mm) — 16, 20, 25, 32 for FSR
- 2
- Spline nuts per shaft (blank = 1)
- FSR
- Nut type — RS cylinder · FS flange · FSR rotary
- 400
- Length of straight groove (mm)
- 500
- Total shaft length (mm)
- C
- Accuracy — C normal · H high · P precision
- S
- Shaft marking — S solid · blank hollow
The configurator assembles this number for you, with drawings and 3D CAD. Configure ↗
Accuracy grades
Graded C, H and P by runout against the shaft supports; FSR is additionally inspected for outer ring verticality and runout.
- C Normal — General torque-transmission duty
- H High — Repeatable positioning axes
- P Precision — Ring runout to 18 µm, shaft runout to 9 µm under 200 mm
Clearance & preload
Preload removes rotational clearance before the load arrives; stiffness more than doubles and the effect holds to 2.8x the preload force.
- — No preload — Smooth small-force drives, torsion in one direction
- Light 0 - 0.02C — Cantilever or variable loads, repeat accuracy (robot arms, EDM)
- Medium 0.05C - 0.07C — High stiffness under vibration and moment loads
Shaft execution
- S Solid shaft — Standard
- — Hollow shaft — Weight reduction, air or cable pass-through
Other Ball Splines
How buying works
Spec it in the configurator: drawings, 3D CAD, and a quote to follow.
HIWIN series are configured to your application, not bought off the shelf. Start from your loads and speeds if you are still choosing a size.
Rather talk it through? Request a quote from an application engineer.