FS Type Series
FS Type Linear Ball Spline, Flange Nut
- Nut Type
- Flange (FS)
- Shaft Diameter
- 13 - 32 mm
- Accuracy Grades
- C, H, P
- Dynamic Load Rating
- 4.07 [kN] - 20.5 [kN]
The FS Series Ball Splines are designed for linear motion, featuring a flanged ball nut for easy housing installation, efficient torque transmission, and an optimized lubricating channel and retainer design.
Same spline core without the flange: the RS cylinder nut is the compact version for the smallest envelopes. View RS Type →
-
181.5 N·m
Dynamic torque rating at Ø32
-
2x
Rotational stiffness with preload applied
-
9 µm
P-grade runout, shafts under 200 mm
Applications
- Industrial robot arms
- Automatic loading and unloading machines
- EDM and drilling main shafts
- Stamping die guide shafts
- Measuring instruments and dynamometers
- Winding and packing machines
Sizes
FS is the RS cylinder nut with a mounting flange: same five shaft sizes, same load and torque ratings, bolted to the housing instead of retained by a ring. On SP13 and smaller the flange holes sit in a different position than SP16 and larger; specify hole position relative to the shaft end when ordering.
| Model | Shaft Ø (mm) | Dynamic load C (kN) | Dynamic torque CT (N·m) | Configure |
|---|---|---|---|---|
| SP-13-FS | 13 | 4.07 | 5.98 | Configure ↗ |
| SP-16-FS | 16 | 7.2 | 32.1 | Configure ↗ |
| SP-20-FS | 20 | 10.4 | 57.8 | Configure ↗ |
| SP-25-FS | 25 | 15.4 | 106.5 | Configure ↗ |
| SP-32-FS | 32 | 20.5 | 181.5 | Configure ↗ |
Part numbers & options
How a part number reads
SP - 20 - 2 FS - 400 - 500 - C - S
- SP
- Ball spline product family
- 20
- Spline shaft outer diameter (mm) — 13, 16, 20, 25, 32
- 2
- Spline nuts per shaft (blank = 1)
- FS
- 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 by runout of the nut outer diameter against the shaft supports; tolerance scales with shaft length, and FS adds a flange-face verticality check.
- C Normal — General torque-transmission duty
- H High — Repeatable positioning axes
- P Precision — Runout to 9 µm under 200 mm shafts
Clearance & preload
Preload removes rotational clearance; 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.