1. The Prefix & Base Model (Digits 1–5)
The first letter and subsequent four numbers explicitly dictate the physical footprint and internal rolling element style of the runner block. [1]
- The Letter "R": Stands for Rexroth. [1]
- The Second & Third Digits ("16"): Identifies a standard ball bearing rail system. (If it reads R18, it is a heavy-duty Roller Rail System instead). [1, 2, 3]
- The Fourth & Fifth Digits (The Geometry): This identifies the block shape layout you have:
(R1651): Represents a FNS (Flanged, Normal, Standard Height) block footprint.(R1653): Represents a FLS (Flanged, Long, Standard Height) block footprint.(R1622): Represents a SNS (Slimline, Normal, Standard Height) block footprint.(R1623): Represents a SLS (Slimline, Long, Standard Height) block footprint. [1, 2, 3, 4, 5]
2. The Size Code (Digit 6)
The sixth digit determines the physical width of the guide rail (in millimeters) that the block is designed to clip onto. [1, 2, 3]
1= Size 15 rail width8= Size 20 rail width2= Size 25 rail width7= Size 30 rail width3= Size 35 rail width4= Size 45 rail width [1, 2, 3, 4, 5, 6]
3. Preload & Internal Build (Digit 7)
The seventh digit tells you how tightly compressed the ball bearings are packed inside the runner block tracks. [1, 2]
9(Preload Class C0): Clear, zero-preload setup for smooth, low-friction application tracking.1(Preload Class C1): Moderate 2% preload. Offers basic operational rigidity and stability.2(Preload Class C2): Average 8% preload. Built for precision machining with minimal physical deflection. [1, 2, 3, 4, 5]
4. Accuracy Grade (Digit 8)
The eighth digit defines the spatial variation and travel tolerance thresholds of the component. [1, 2]
4(Accuracy Class N): Normal accuracy. Standard for material packaging and conveyor automation.3(Accuracy Class H): High accuracy. Excellent for pick-and-place and scanning sensors.2(Accuracy Class P): Precision grade accuracy. Used for high-end industrial CNC machine centers. [1, 2, 3, 4, 5]
5. End Seals & Lubrication Formats (Digits 9–10)
The final two digits represent the factory sealing arrangement and options like integrated ball chains. [1, 2, 3]
20: Standard all-round dynamic seal without ball chain elements.22: Standard seal equipped with a low-noise internal ball chain spacer.23: Low-friction seal option (LS) for light travel resistance applications. [1, 2, 3]
Quick Reference Decoding Table
+---------------+---------------------+-----------+-------------------+-----------------+
| Part Code | Block Shape Family | Rail Size | Preload Metric | Accuracy Class | +---------------+---------------------+-----------+-------------------+-----------------+
| R1651 713 20 | FNS (Flanged Normal)| Size 30 | C1 (Moderate 2%) | H (High Class) | | R1622 214 20 | SNS (Slimline Norm) | Size 25 | C1 (Moderate 2%) | N (Normal Class)| +---------------+---------------------+-----------+-------------------+-----------------+
Streamline Retrofitting and Sizing Digitally
Because Bosch Rexroth utilizes completely interchangeable manufacturing methods, an older R1622 block can be safely swapped out on your existing production rail using online tools: [1, 2, 3]
- Punch your partial code into the Linear Motion Technology Selector to instantly pull up complete dimensional drawings, replacement block parameters, and matching accessories.
- If you are upgrading from an older accuracy or preload standard, load the specs into the Linear Motion Designer (LMD) cloud software to instantly verify how changes to the part structure alter your expected operating life.
SEO Meta Data (For Website Implementation)
- Target Focus Keyword:
Rexroth part number structure - Secondary Keywords:
R1651 runner block,R1622 linear guide,Bosch Rexroth part lookup,linear guide replacement parts,runner block nomenclature. - Meta Description: Need to replace a worn-out linear guide? Read our guide on decoding the Bosch Rexroth part number structure to cross-reference R1651 and R1622 blocks.
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