1. The Prefix & Nut Family Code (Digits 1–5)
The initial characters explicitly define the baseline physical housing geometry, standard dimensions, and recirculation design of the ball nut.
- The Letter "R": Stands for Rexroth.
- The Second & Third Digits ("15"): Identifies the premium Precision Ball Screw Assembly ecosystem. [1]
- The Fourth & Fifth Digits (The Nut Profile): This indicates the physical mounting profile and structural shape:
02(R1502): Represents a FEM-E-C or FEM-E-S Flanged Single Nut configuration with integrated Rexroth or DIN mounting dimensions.12(R1512): Represents a ZEM-E-S Cylindrical Single Nut profile designed for sleek, compact space housings.32(R1532): Represents a FDM-E-C Heavy-Duty Double Nut configuration built to completely eliminate operational backlash. [, 2, 4]
2. Nominal Shaft Diameter Index (Digit 6)
The sixth digit dictates the core outer physical diameter of the steel screw spindle shaft. [1]
0= 16 mm diameter1= 20 mm diameter2= 25 mm diameter3= 32 mm diameter4= 40 mm diameter5= 50 mm diameter6= 63 mm diameter [1, 2, 3]
3. The Lead Pitch Multiplier (Digit 7)
The seventh digit specifies the precise linear travel distance (lead pitch) achieved during one full 360-degree rotation of the screw shaft.
0= 5 mm lead pitch (Standard travel)4= 10 mm lead pitch (High-speed transport)7= 20 mm lead pitch (Ultra-high speed travel)9= 32 mm / 40 mm pitch (Massive lead variations) [1, 2]
Example: An R1512 240... configuration denotes a Cylindrical Nut built for a 25 mm diameter shaft with a 10 mm lead pitch. [1, 2]
4. Preload Selection Class (Digit 8)
The eighth digit determines the stiffness and compression fitting of the internal steel ball bearings to combat mechanical backlash.
0(Preload Class C0 / C00): Standard clearance or standard zero-backlash configuration.1(Preload Class C1): Light 2% dynamic preload. Maximizes smooth operation while optimizing positional accuracy.2(Preload Class C2): Moderate 5% preload. Engineered for rigid industrial applications like axis milling tooling frames. [1, 2, 3, 4]
5. Wiper Seals & Directional Handing (Digits 9–10)
The final two digits represent safety seal types and whether the thread wraps left or right.
13: Standard right-hand thread orientation equipped with durable elastomer wiper seals on both ends.41: Low-friction, non-contact gap seal configuration specifically tailored for ultra-low torque requirements.63: Left-hand thread orientation containing standard dual-lipped wipers. [, 2]
Quick Reference System Breakdown
+---------------+---------------------+-----------+------------+--------------------+
| Part Code | Nut Housing Profile | Shaft Dia | Lead Pitch | Factory Preload | +---------------+---------------------+-----------+------------+--------------------+
| R1502 340 13 | FEM-E-S (Flanged) | 32 mm | 10 mm | Standard Clearance | | R1512 210 13 | ZEM-E-S (Cylindrical| 25 mm | 5 mm | Standard Clearance | +---------------+---------------------+-----------+------------+--------------------+
Configuring Complete Shaft Assemblies Online
When procuring a fully built assembly, the base nut code is paired with a string defining the total length and machined shaft ends (e.g., Form 51 or Form 91 bearing journals). To avoid errors during configuration:
- Launch the Linear Motion Technology Selector to input your exact required stroke length, critical speed limits, and target axial loads.
- Run your component selection through the Linear Motion Designer (LMD) to simulate complex rotational torque limits and verify the exact continuous runtime lifespan of your integrated ball nut assembly. [1]
SEO Meta Data (For Website Implementation)
- Target Focus Keyword:
Rexroth ball screw part number structure - Secondary Keywords:
R1502 ball nut,R1512 cylindrical nut,Bosch Rexroth BASA,ball screw assembly nomenclature,precision screw drives. - Meta Description: Replacing an industrial drive shaft? Read our guide on decoding the Bosch Rexroth ball screw part number structure to cross-reference R1502 and R1512 systems.
 utilize a highly structured, 10-digit alphanumeric format (e.g., R1512 2 4 0 13) to identify individual ball nuts and complete driven screw setups){kind=link}