BOSCH Rexroth R165121320 Runner Block for Linear Motion Systems
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  • BOSCH Rexroth R165121320 Runner Block for Linear Motion Systems

BOSCH Rexroth R165121320 Runner Block for Linear Motion Systems

Processing time: 2-3 days
€82.79 (net)
Price for: 1pcs.

The BOSCH Rexroth R165121320 runner block provides the perfect combination of precision, rigidity, and long-term reliability for demanding linear motion applications. Designed for professional use in CNC and industrial automation systems, it ensures consistent performance under dynamic loads.

📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24 h delivery - fast order fulfillment

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Description

The R165121320 BOSCH Rexroth runner block, also marked as KWD-025-FNS-C1-H-0, is a high-precision ball runner block designed for modern linear guide systems. Built from hardened steel with a flanged (FNS) construction, this block ensures excellent rigidity, low friction, and smooth, vibration-free operation across industrial automation and CNC applications.

The block belongs to the Bosch Rexroth size 25 mm series and is optimized for accuracy class H (high) with preload class C1. This combination guarantees precise movement with controlled stiffness and no play, even under high dynamic loads.
Standard double-lip sealing (SS) protects the internal ball circuit from dust and contamination, significantly extending service life. The unit is factory pre-lubricated and equipped with service ports for easy maintenance and relubrication when necessary.

Engineered for performance and endurance, the R165121320 runner block offers high load-carrying capacity and repeatable precision, making it ideal for CNC machines, industrial robots, pick-and-place equipment, packaging lines, and measuring systems. It integrates seamlessly with Rexroth linear rails, ensuring full compatibility and effortless installation in existing linear motion designs.

Applications

  • CNC machining centers and milling systems

  • Industrial automation and robotics

  • Precision assembly and packaging equipment

  • Material handling and positioning systems

  • Linear axes in measuring and inspection machinery

  • Motion units requiring high stiffness and low friction

Technical Specifications

Parameter Value
Product Code R165121320 (KWD-025-FNS-C1-H-0)
Type Ball Runner Block, Flanged (FNS)
Rail Size 25 mm
Preload Class C1 - moderate preload
Accuracy Class H - high precision
Material Hardened carbon steel
Sealing SS - standard side seals
Lubrication Pre-lubricated, re-lubrication ports included
Max. Speed up to 5 m/s
Dynamic Load Capacity (C) approx. 21 000 N
Static Load Capacity (C₀) approx. 29 000 N
Operating Temperature −10 °C … +80 °C
Manufacturer BOSCH Rexroth

Product Advantages

  • ⚙️ High-precision linear motion - optimized ball path geometry for smooth travel

  • 🛡️ Effective sealing system - protects internal raceways from dust and debris

  • 🔧 Pre-lubricated and service-friendly - ready for immediate installation

  • 🧱 Robust steel construction - high rigidity and long service life

  • 📏 Compact flanged design - stable mounting even in tight installations

  • 🌍 Fully compatible with Bosch Rexroth 25 mm rails - drop-in interchangeability

FAQ

1. What does R165121320 refer to?
It is a BOSCH Rexroth runner block, type KWD-025-FNS-C1-H-0, designed for 25 mm linear guide rails.

2. Is the block pre-lubricated?
Yes. It comes filled with factory grease and ready for operation.

3. What does “C1 preload” mean?
C1 indicates medium preload — a balance between rigidity and smooth running accuracy.

4. Does it include sealing?
Yes, standard SS side seals are fitted to prevent contamination and extend bearing life.

5. Where is it typically used?
In CNC, automation, and robotics systems where precise linear movement is required.

BOSCH
R165121320
Processing time: 2-3 days

Data sheet

Mark
BOSCH