R165121420 KWD-025-FNS-C1-N-1 Bosch Rexroth Ball Runner Block Carriage

The Bosch Rexroth KWD-025-FNS-C1-N-1 is a high-rigidity, flange-mounted ball runner block designed for larger linear motion systems requiring excellent load capacity, enhanced stability and precise positioning. With its FNS configuration (flange width, normal block length, standard height), this size-25 block offers a wide footprint for secure mounting while maintaining smooth, consistent travel. Constructed from durable carbon steel and delivered pre-lubricated, it is engineered for high-duty industrial applications where reliability and accuracy are essential.

Key Features

• FNS design (Flange / Normal length / Standard height) — provides a wide, secure mounting base and dependable load distribution.

• Size 25 — suited for larger machinery and higher load requirements compared to size-20 systems.

• Carbon steel construction — offers outstanding rigidity, durability and resistance to deformation under load.

• C1 preload (light preload) — reduces internal clearance and improves travel stability, ideal for precision positioning and consistent running accuracy.

• Accuracy class N — reliable general-purpose accuracy for industrial automation, CNC and heavy mechanical systems.

• Standard sealing (SS) — protects internal ball tracks from common industrial contaminants.

• Pre-lubricated & sealed — ready for installation with no initial maintenance required.

• High static, dynamic and moment load capacities — suitable for heavy-duty or multi-direction load environments.

• Compatible with Bosch Rexroth size-25 FNS, FLS and SNS rails.

Technical Specifications

• Nominal size: 25 mm

• Block format: FNS — Flange width, Normal length, Standard height

• Material: Carbon steel

• Preload class: C1 (Light preload)

• Accuracy class: N (Standard precision)

• Seal type: Standard seal (SS), without ball chain

• Flange width: approx. 70 mm

• Block length: approx. 86 mm

• Block height with rail: around 36 mm

• Block weight: approx. 0.85 kg

• Dynamic load capacity (C): ≈ 36,000 N

• Static load capacity (C₀): ≈ 47,000 N

• Dynamic torsional moment capacity (Mt): ≈ 500 Nm

• Dynamic longitudinal moment capacity (ML): ≈ 340 Nm

• Static moment capacities (Mt₀ / ML₀): ≈ 600 Nm / 500 Nm

• Maximum permissible speed: 5 m/s

• Maximum permissible acceleration: 500 m/s²

• Lubrication: Factory grease-filled, with relubrication capability

• Typical operating temperature range: –10°C to +80°C

• Mounting type: Flange-mounted runner block with top-mounted mounting holes

Typical Applications

The KWD-025-FNS-C1-N-1 is ideally suited for:

• CNC machining centres, milling machinery and industrial routers

• Large automation systems and heavy industrial assembly equipment

• Robotics and material-handling applications under substantial loads

• Precision positioning systems requiring low clearance and stable travel

• Long-travel or high-force linear motion setups using size-25 rails

• Retrofit or replacement of existing Bosch Rexroth size-25 flanged runner blocks

Why Buy from Bearing King Ltd

Choosing Bearing King Ltd provides:

• Genuine Bosch Rexroth OEM runner blocks you can rely on

• Competitive UK pricing with fast delivery

• Expert support for preload selection, rail matching and integration

• Pre-lubricated, ready-to-install units that minimise downtime and maximise durability