Calculate operational life for Bosch-style planetary roller screws. Explore engineering specifications, dimensions, and discover faster-sourcing equivalents for high-load linear motion.
Bosch-style planetary roller screws offer up to 3-5 times the dynamic load capacity of equivalent-sized ball screws, with ratings up to 544 kN for standard sizes.
The market has converged on standard dimensions (20mm - 75mm) for Bosch-style screws, allowing for precise form-fit-function equivalents from specialized manufacturers.
While OEM lead times for Bosch roller screws can exceed 16 weeks, identical specification alternatives are frequently produced in 6-8 weeks, mitigating downtime.
Bosch planetary roller screws utilize threaded rollers that provide significantly more contact points than a ball screw, multiplying the load capacity and shock resistance.
Reference limits based on standard Bosch roller screw geometries. Drop-in equivalents strictly match these ratings.
| Screw Diameter | Typical Leads | Dynamic Load (Cd) | Static Load (C0) |
|---|---|---|---|
| 20 mm | 5 mm | 33.4 kN | 44.5 kN |
| 30 mm | 5, 10 mm | 75.2 - 80.5 kN | 120 - 125 kN |
| 39 mm | 5, 10 mm | 110 - 130 kN | 195 - 220 kN |
| 48 mm | 10, 15, 20 mm | 210 kN | 450 kN |
| 60 mm | 10, 20 mm | 320 kN | 700 kN |
| 75 mm | 10, 20 mm | 480 kN | 1,200 kN |
Calculation boundaries and data sourcing for our roller screw evaluations.
| Reference Standard | Application | Known Boundary |
|---|---|---|
| ISO 3408-5 Standard | Defines the calculation methods for dynamic load ratings and L10 life in planetary roller screws, ensuring parity between OEM and equivalent units. | Applicable to standard planetary roller designs, excluding inverted or differentiated internal thread mechanics. |
| Bosch Rexroth PLSA Documentation | Provides baseline performance metrics (e.g., Cd = 320kN for 60x10) against which drop-in equivalents are validated. | Comparisons rely on standard nut configurations. Specialized preloads may vary in overall nut length. |
Bosch planetary roller screws use threaded rollers instead of recirculating balls. This vastly increases the contact surface area, allowing them to carry significantly higher loads, withstand heavy shock, and last longer in harsh environments.
The calculator above provides the theoretical L10 life based on dynamic capacity (Cd) and applied load. However, actual life is influenced by lubrication quality, temperature, and shock loads. L10 represents the life that 90% of a group of identical screws will exceed.
Yes. Many specialized manufacturers produce roller screws to the same ISO 3408 dimensions, meaning the shaft diameter, lead, and nut flange bolt circle perfectly match standard Bosch PLSA units.
The most common reasons are lead time reduction (from 20+ weeks down to 6-8 weeks) and cost optimization (saving 20-30%), without sacrificing load capacity or dimensional accuracy.
No. As long as you specify the correct form-fit equivalent and provide the end-machining drawing, the new screw will mount exactly into your existing machine frame and motor coupling.
Provide us with your Bosch part number or dimensions, and our engineering team will identify a drop-in equivalent with exact matching specs and faster delivery.
Inquiry Email
Include force, stroke, speed, duty cycle, life target, quantity, and delivery country.
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