Ball Screws with Cylindrical Nuts
- Max Static Load: 2,180 N
- Max Dynamic Load: 1,490 N
- Screw Diameters: 6 mm to 10 mm
- Leads: 1 mm to 2.5 mm
- Screw Lengths: 150 mm to 500 mm
- Accuracy Grades: Grade 7, Grade 10
- Screw Finish: Rolled
Ball screws with cylindrical nuts are precision linear motion assemblies that use recirculating steel balls between a threaded screw shaft and nut to convert rotary motion into accurate linear movement with low friction and high efficiency. Unlike lead screws, which rely on sliding contact between threads, ball screws use rolling contact to move and accurately position loads. The cylindrical ball nut has a round, non-flanged body that fits inside a matching housing, providing a more compact assembly than many flanged-nut designs.
PBC Linear miniature ball screw assemblies are available with 6mm, 8mm, and 10mm screw diameters and 1mm, 2mm, or 2.5mm leads, depending on screw size. Lead is the axial distance the nut travels during one complete screw rotation; smaller leads support finer positioning, while larger leads provide more travel per revolution. The steel screw shafts are precision-rolled for consistent lead accuracy over the screw length.
Each cylindrical nut contains a multi-liner ball-return system that guides the recirculating balls through the nut for continuous, low-friction motion. Polymer wipers at both ends help block debris and retain lubrication around the internal ball tracks. Standard-fit nuts provide no more than 0.05mm backlash, while transitional-fit options reduce play and may apply slight preload for greater rigidity and more responsive direction changes.
Assemblies support static axial loads up to 2.18kN (490lb), depending on the selected size and configuration. Custom screw lengths, nut fits, and journal machining are available through the custom configurator. A journal is the machined section at one or both screw ends that fits a bearing, coupling, motor, support block, or other mounting component.
- Compact cylindrical ball nut for installation inside a matching housing
- More space-efficient than many flanged-nut designs
- Available in 6mm, 8mm, and 10mm screw diameters
- Lead options of 1mm, 2mm, and 2.5mm, depending on screw size
- Precision-rolled steel screw shafts for consistent lead accuracy
- Multi-liner ball-return system for continuous ball recirculation
- Polymer wipers at both nut ends help block debris and retain lubrication
- Standard-fit nut: no more than 0.05mm backlash
- Transitional-fit nut available for reduced play and optional slight preload
- Static axial load capacity: up to 2.18kN (490lb)
- Custom lengths, nut fits, and journal machining available through the custom configurator
- A journal is the machined screw-end section that fits bearings, couplings, motors, support blocks, or other mounting components
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Products (10)
*Full dimensions shown on individual product pages
| Name | Dia. mm | Lead mm | Length mm | Ca (N) | Coa (N) | Price | Actions |
|---|---|---|---|---|---|---|---|
| BSR0601ATXR-0150-CNS-NNN-NNN-N | 6 | 1 | 150 | 740 | 970 | $131.21 | Shop |
| BSR0801ATXR-0150-CNS-NNN-NNN-N | 8 | 1 | 150 | 900 | 1340 | $131.21 | Shop |
| BSR1002ATXR-0500-CNS-NNN-NNN-N | 10 | 2 | 500 | 1490 | 2180 | $165.52 | Shop |
| BSR0801ATXR-0250-CNS-NNN-NNN-N | 8 | 1 | 250 | 900 | 1340 | $141.01 | Shop |
| BSR0601ATXR-0250-CNS-NNN-NNN-N | 6 | 1 | 250 | 740 | 970 | $141.01 | Shop |
| BSR08025T7R-0250-CNS-NNN-NNN-N | 8 | 2.5 | 250 | 1320 | 1700 | $145.91 | Shop |
| BSR08025T7R-0150-CNS-NNN-NNN-N | 8 | 2.5 | 150 | 1320 | 1700 | $134.15 | Shop |
| BSR1002ATXR-0200-CNS-NNN-NNN-N | 10 | 2 | 200 | 1490 | 2180 | $136.10 | Shop |
| BSR0802ATXR-0150-CNS-NNN-NNN-N | 8 | 2 | 150 | 1320 | 1700 | $131.21 | Shop |
| BSR0802ATXR-0250-CNS-NNN-NNN-N | 8 | 2 | 250 | 1320 | 1700 | $141.01 | Shop |
Cylindrical-style ball screw nuts allow for a more compact assembly design than their flange counterpart.
- Five metric sizes, measured in diameters x leads
- Utilizes a multi-liner ball return system
- Static axial load to 2.18 kN (490 lb)
- Ideal for applications requiring high precision and efficient linear motion
- Polymer wipers located at each end of the nut help prevent the ingress of debris and particulates
- Preload option for higher rigidity and better positional accuracy
- Screws are precision rolled to achieve lead accuracy and consistency over the full length of the screw
| Dia. x Lead mm |
ØD mm |
L mm |
L1 mm |
L2 mm |
M x R (P9) mm |
|---|---|---|---|---|---|
| 6 x 1 | 12 | 15 | 8 | 2.4 | 2 x 1.2 |
| 6 x 2 | 12 | 17 | 8 | 2.4 | 2 x 1.2 |
| 8 x 1 | 14 | 16 | 8 | 3.4 | 2 x 1.2 |
| 8 x 2 | 14 | 16 | 8 | 2.1 | 2 x 1.2 |
| 8 x 2.5 | 16 | 26 | 10 | 4.8 | 3 x 2 |
| 10 x 2 | 18 | 28 | 10 | 5.3 | 3 x 1.2 |
| Dia. x Lead mm |
Static Coa(kN) |
Dynamic Ca(kN) |
|---|---|---|
| 6 x 1 | 0.97 | 0.74 |
| 6 x 2 | 1.14 | 1.05 |
| 8 x 1 | 1.34 | 0.90 |
| 8 x 2 | 1.70 | 1.32 |
| 8 x 2.5 | 1.70 | 1.32 |
| 10 x 2 | 2.18 | 1.49 |
| Dia. x Lead mm |
Screw OD d1 (mm) |
Screw Root Ø d2 (mm) |
Lead Ph (mm) |
Ball Diameter Dw (mm) |
Starts x Circuits |
|---|---|---|---|---|---|
| 6 x 1 | 5.95 | 5.37 | 1 | 0.8 | 1 x 3 |
| 6 x 2 | 5.95 | 5.13 | 2 | 1.2 | 1 x 3 |
| 8 x 1 | 7.95 | 7.29 | 1 | 0.8 | 1 x 4 |
| 8 x 2 | 7.95 | 7.08 | 2 | 1.2 | 1 x 3 |
| 8 x 2.5 | 7.95 | 7.07 | 2.5 | 1.2 | 1 x 3 |
| 10 x 2 | 9.95 | 9.09 | 2 | 1.2 | 1 x 3 |
The static and dynamic load ratings of PBC Linear ball screws were determined by the ISO 3408 standard calculations.
The dynamic load rating, Ca, is the load at which 90% of properly lubricated identical ball screws will reach 1 x 106 revolutions.
The static load rating, Coa, is an axial static load which will produce a permanent deformation at contact points of the steel balls to ball grooves equal to 0.01% of the ball diameter.