Identify drop-in replacements for Rexroth PLSA planetary screw assemblies. Compare load ratings (up to 544 kN) and reduce lead times without compromising machine performance.
Rexroth PLSA standard sizes (e.g., 20x5, 39x10, 48x20, up to 75mm) have direct ISO 3408 dimensional equivalents. This allows form-fit-function replacements without modifying machine frames or motor mounts.
Alternative assemblies match or exceed Rexroth's maximum dynamic load capacity (544 kN) and static load (1,496 kN) through identical thread grinding and heat-treatment profiles.
While OEM supply chains may quote 16-24 weeks for non-stocked PLSA sizes (especially preloaded flanged nuts), specialized equivalents are routinely delivered in 6-8 weeks with custom end-machining.
Critical matching criteria: Screw shaft diameter (d0), lead (5-20mm), and nut flange geometry (Bolt Hole Circle & Outer Diameter).
Comparing standard specifications for drop-in replacements based on ISO 3408 standards.
| Specification | Rexroth PLSA | Drop-In Equivalent |
|---|---|---|
| Size Range (Diameter) | 20mm - 75mm | 20mm - 75mm (1:1 Match) |
| Standard Leads | 5mm, 10mm, 15mm, 20mm | 5mm, 10mm, 15mm, 20mm |
| Max Dynamic Load (Cd) | Up to 544 kN | Matches or Exceeds (≥544 kN) |
| Max Static Load (C0) | Up to 1,496 kN | Matches or Exceeds (≥1,496 kN) |
| Nut Configurations | Flanged (ZF) & Cylindrical (ZC) | Flanged & Cylindrical Available |
How our equivalent planetary roller screws perform in real-world retrofits previously dominated by Bosch Rexroth.
Problem: A 48x20 Rexroth PLSA in an automotive press failed after 4 years. OEM quoted 22 weeks for replacement.
Solution: Dropped in an equivalent 48x20 flanged nut assembly with matched Form 82 end machining.
Result: Machine restored in 6 weeks; saved 35% on parts.
Problem: High-speed ejector required identical stiffness and T3 lead accuracy. Original Rexroth screw was obsolete.
Solution: Engineered a reverse-engineered 39x10 equivalent maintaining zero backlash via oversized rollers.
Result: Zero reduction in part tolerance; identical cycle times.
Problem: Needed a cost-effective, high-load replacement for a 20x5 PLSA undergoing extreme vibration.
Solution: Supplied a 20x5 equivalent with matched grease retainers and induction-hardened raceways.
Result: Passed 5-million cycle endurance testing successfully.
Problem: High static load (C0) requirement (over 1000 kN). Needed a direct swap for a 75x20 Rexroth screw.
Solution: ISO 3408 compliant 75mm screw with customized cylindrical nut and M6 lube ports.
Result: 1:1 footprint match, handling 1200 kN peak static load.
| Component / Service | OEM (Bosch Rexroth) | Equivalent Alternative |
|---|---|---|
| Standard 39mm/48mm Nuts | 16 - 24 Weeks | 6 - 8 Weeks |
| Custom End Machining | High Premium | Standard Pricing |
| Replacement Economics | Baseline Cost (100%) | 60% - 85% of OEM Cost |
| Rexroth Form Code | Description | Alternative Capability |
|---|---|---|
| Form 81 / 82 | Fixed bearing end with threaded locknut | Fully Supported (Matched Tolerance) |
| Form 91 / 92 | Support bearing end (simple support) | Fully Supported (Matched Tolerance) |
| Form 00 | Cut to length only (annealed) | Fully Supported |
Cross-reference data is based on published catalogs and ISO mechanical standards.
| Reference | Context in Sizing | Boundary Note |
|---|---|---|
| Rexroth PLSA Catalog (R310EN 3301 & R999001185) | Defines baseline load ratings (up to 544 kN dynamic), nominal diameters (20mm - 75mm), and nut styles (cylindrical/flanged). | Comparisons assume standard backlash classes. Preloaded split-nut equivalents require specific verification against OEM oversize-roller preload methods. |
| ISO 3408-5 & DIN 69051 | Calculates expected L10 life equivalence between the Rexroth screw and the alternative based on standardized rolling contact fatigue. | Does not account for differences in proprietary seal friction, specialized anti-corrosion coatings, or non-standard lubrication intervals. |
No. Planetary roller screw nuts and shafts are factory-matched sets. You cannot thread a competitor's nut onto a Rexroth shaft due to proprietary thread grinding profiles, tight tolerances, and matched planetary rollers.
Yes. For example, a 60x10 equivalent will typically match Rexroth's published dynamic load capacity (C) of ~320 kN and static load (C0) of ~700 kN, as long as it is manufactured to ISO 3408 standards using equivalent bearing steel.
Provide the full Rexroth PLSA part number (e.g., R1512 340 12), the overall length of the screw, the nut style (flanged or cylindrical), and any drawings of the machined ends.
While internal geometry (such as roller count and exact pitch diameter) may vary slightly between manufacturers to optimize load sharing or avoid patents, the external boundary dimensions and functional load capacities remain equivalent.
Rexroth often uses oversized rollers for preload in a single nut. Alternatives may use oversized rollers or a two-piece split nut design. Both methods achieve zero backlash, but the split nut approach might increase the overall nut length slightly.
Standard alternatives include identical or functionally equivalent PTFE or NBR wiper seals to protect against contamination and retain lubrication, just like the original Rexroth ZF/ZC nuts.
Equivalents use induction hardened or case hardened alloy steel (typically 50-60 HRC) matching Rexroth specifications to ensure identical wear resistance and fatigue life.
Yes, equivalents are ground to standard ISO/DIN accuracy classes (such as T3, T5) providing identical lead precision (e.g., 12µm / 300mm for T3).
Absolutely. We can replicate any standard Rexroth end journal machining (Form 81, 82, 91, etc.) or machine custom ends according to your specific 2D drawings.
The Nd0 (speed parameter) remains consistent because it depends on the pitch diameter and bearing kinematics, typically allowing max speeds equivalent to Rexroth limits.
No. Equivalent nuts have matching lubrication port configurations (M6 or M8 threaded holes) allowing you to connect your existing automated greasing lines without modification.
If your original screw uses a dense chrome or black oxide coating for corrosion resistance, the equivalent can be manufactured with the same surface treatment.
Depending on the size and volume, cost savings can range from 15% to 40% compared to OEM replacement parts, with significantly faster delivery times.
Ready to find a replacement? Send us your Bosch Rexroth part number (e.g. R1512...), drawing, or application requirements, and our engineers will provide a direct equivalent with pricing and availability.
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Include force, stroke, speed, duty cycle, life target, quantity, and delivery country.
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