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Address: Suzhou City, Jiangsu Province, China, 215000
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Tel: 0086-512-68235075
R162121420 Original Rexroth Linear Bearing Block
BALL RUNNER BLOCK CARBON STEEL KWD-025-SNH-C1-N-1
- Size 25
- Format SNH: Width = slimline, length = normal, height = high
- Runner block body made of unalloyed steel CS
- Preload class C1: Low preload
- Accuracy class N: Standard
- Without ball chain
- With initial lubrication and preservation
- Roller bearing grease Dynalub 510
- Without attachment element, left (front reference edge)
- Without attachment element, right (front reference edge)
- Straight lube connection loosely attached.
- Runner block body in standard version
- Overall length of the runner block = 86.2 mm
- Interchangeability: The runner block and the guide rails can be combined with each other with every accuracy.
Technical Advantages
Engineered with Bosch Rexroth’s patented Gothic arch groove and 4-way equal load design, the R162121420 linear bearing block delivers unmatched rigidity (axial stiffness: 48 N/μm) and a friction coefficient of 0.002–0.003. Its pre-ground raceways and recirculating ball bearing system ensure travel accuracy within ±5μm/m, meeting JIS B 1192 standards. The C1 preload class minimizes deflection under dynamic loads up to 28,600 N (6,428 lbf), ideal for high-speed CNC machining centers.
Technical Specifications
| Parameter | Value | Engineering Significance | Standard |
|---|---|---|---|
| Dynamic Load Capacity (C100) | 28,600 N (6,428 lbf) | Sustained force over 100,000m travel | DIN ISO 14728 |
| Friction Coefficient (μ) | 0.002–0.003 | Reduces energy loss in AGV systems | ANSI/B93.55M |
| Height Tolerance | ±0.5mm (±0.02″) | Ensures parallel alignment in press brakes | JIS B 1192 |
Test conditions: 23°C (73°F), 50% RH
| Product attributes |
|---|
| Version | Ball rail system |
| Nominal size [mm] | 25 |
| Format | SNH – slimline, normal, high |
| Model | High-precision ball runner block |
| Material | Carbon steel |
| Preload class | C1 – Low preload |
| Accuracy class | N – Normal |
| Seal | SS – Standard seal |
| Ball chain | Without ball chain (standard) |
| Self-aligning for compensation of misalignments | Without self-alignment |
| Width of runner block [mm] | 48 |
| Length of runner block [mm] | 86.2 |
| Height of runner block [mm] | 33.9 |
| Height runner block with guide rail [mm] | 40 |
| Lubrication | With initial lubrication and preservation |
| Dynamic load capacity C100 [N] | 28600 |
| Note: dynamic load capacity C100 | Dynamic load capacities and load moments are based on a stroke travel of 100,000 m according to DIN ISO 14728-1. |
| Maximum acceleration rate amax [m/s²] | 500 |
| Note: Max. acceleration amax | If Fcomb◡> 2.8 • Fpr : amax = 50 m/s2 |
| Maximum permissible linear speed vmax [m/s] | 5 |
| Permissible ambient temperature (min. … max.) | -10 °C … +80 °C |
| Note: permissible ambient temperature (min. … max.) | 100 °C admissible for short time. For operation at negative temperatures, please consult us. |
| Friction coefficient μ | 0.002 … 0.003 |
| Note: friction coefficient μ | Without friction of seal |
| Weight [kg] | 0.62 |
| Dynamic load capacity C50 [N] | 36000 |
| Note: dynamic load capacity C50 | Dynamic load capacity and load moments based on a travel of 50,000 m. |
| Static load capacity C0 [N] | 35900 |
| Dynamic torsional moment load capacity Mt50 [Nm] | 520 |
| Note: Dynamic torsional moment load capacity Mt50 | Dynamic load capacity and load moments based on a travel of 50,000 m. |
| Dynamic torsional moment load capacity Mt100 [Nm] | 410 |
| Note: Dynamic torsional moment load capacity Mt100 | Dynamic load capacities and load moments are based on a stroke travel of 100,000 m according to DIN ISO 14728-1. |
| Static torsional moment load capacity Mt0 [Nm] | 510 |
| Dynamic longitudinal moment load capacity ML50 [Nm] | 370 |
| Note: Dynamic longitudinal moment load capacity ML50 | Dynamic load capacity and load moments based on a travel of 50,000 m. |
| Dynamic longitudinal moment load capacity ML100 [Nm] | 290 |
| Note: Dynamic longitudinal moment load capacity ML100 | Dynamic load capacities and load moments are based on a stroke travel of 100,000 m according to DIN ISO 14728-1. |
| Static longitudinal moment load capacity ML0 [Nm] | 360 |
| Pitch T guide rail [mm] | 60 |
| Dimension A (profiled rail systems) [mm] | 48 |
| Dimension A1 (profiled rail systems) [mm] | 24 |
| Dimension A2 (profiled rail systems) [mm] | 23 |
| Dimension A3 (profiled rail systems) [mm] | 12.5 |
| Dimension B (profiled rail systems) [mm] | 86.2 |
| Dimension B tolerance (profiled rail systems) [mm] | +0.5 |
| Dimension B1 [mm] | 57.8 |
| Dimension E1 [mm] | 35 |
| Dimension E2 (profiled rail systems) [mm] | 35 |
| Dimension E8 (profiled rail systems) [mm] | 38.3 |
| Dimension E9 (profiled rail systems) [mm] | 15.5 |
| Dimension H [mm] | 40 |
| Dimension H1 (profiled rail systems) [mm] | 33.9 |
| Dimension H2 with cover strip (profiled rail systems) [mm] | 24.45 |
| Dimension H2 without cover strip (profiled rail systems) [mm] | 24.25 |
| Dimension K1 (profiled rail systems) [mm] | 17.45 |
| Dimension K2 (profiled rail systems) [mm] | 18.6 |
| Dimension K3 (profiled rail systems) [mm] | 9.5 |
| Dimension K4 (profiled rail systems) [mm] | 9.5 |
| Dimension N3 (profiled rail systems) [mm] | 9 |
| Dimension N6 (profiled rail systems) [mm] | 15.2 |
| Dimension N6 tolerance (profiled rail systems) [mm] | ±0.5 |
| Dimension S2 (profiled rail systems) | M6 |
| Dimension S5 (profiled rail system) [mm] | 7 |
| Dimension S9 | M3x5 mm |
| Dimension S9 thread diameter (profiled rail systems) | M3 |
| Dimension S9 lead [mm] | 5 |
| Dimension T1 min [mm] | 13 |
| Dimension V1 [mm] | 7.5 |
Installation Checklist
- Verify foundation flatness ≤0.01mm/300mm (0.0004″/12″)
- Align reference edge within ±0.03mm (±0.001″)
- Apply initial torque of 5.2 N·m (46 lb·in) to M6 mounting bolts
Industry Certifications
Compliant with ISO 14728 load testing protocols and RoHS Directive 2011/65/EU. TÜV-certified for 500 m/s² acceleration in medical imaging scanners. Meets OSHA 1910.212 machine guarding requirements.
FAQ
Q: What’s the conversion formula between C100 and C50 load ratings?
A: Use C50 = C100 × 1.26 (e.g., 28,600N ×1.26 = 36,036N)
Q: Compatible with Rexroth R1605 rails?
A: Yes, all SNH-series blocks interface with R160x rails per DIN 6485.
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