Bosch Rexroth 123CM CKK 20-145 RFS-05C 0100-35119 Original Spare

Product Overview

Bosch Rexroth 123CM CKK 20-145 RFS-05C 0100-35119 Original Spare: System Stability and Industrial Maintenance Value

In modern manufacturing and process automation environments, the reliability of linear motion components is directly tied to overall system uptime. The Bosch Rexroth 123CM CKK 20-145 RFS-05C 0100-35119 is an original ball screw linear actuator from Bosch Rexroth’s CKK Compact Module series — a platform trusted across precision assembly lines, machine tool applications, semiconductor handling, and automated material transport systems worldwide. Sourced directly from authorized supply channels, this unit is a genuine OEM spare that maintains full dimensional and performance compatibility with existing CKK Series installations.

When a linear actuator fails on a production line, the consequences extend far beyond the component itself. Unplanned downtime, emergency procurement delays, and the risk of secondary damage to connected mechanical and electrical systems all compound the cost of a single failed part. Stocking the CKK 20-145 RFS-05C 0100-35119 as a verified spare eliminates the most critical variable in that scenario: lead time. With this unit on hand, maintenance teams can execute a direct swap within a planned maintenance window rather than scrambling under production pressure.

Critical Technical Specs

Preventive Maintenance Strategy

A ball screw linear actuator like the CKK 20-145 RFS-05C does not operate in isolation. It is one node in a coordinated motion system, and its long-term reliability depends on the condition of every upstream and downstream component in that system. Experienced maintenance engineers know that when a CKK module is pulled for inspection or replacement, it is the ideal moment to audit the entire motion axis.

Begin with the servo motor coupling and motor flange — the mechanical interface between the drive motor and the ball screw input shaft. Worn couplings introduce backlash that accelerates ball screw wear and degrades positioning accuracy. If the CKK module has accumulated significant operating hours, the Bosch Rexroth MKD or MHD series servo motor driving the axis should be checked for bearing noise, encoder signal integrity, and brake function. A failing motor encoder will cause erratic positioning even after a perfect actuator replacement.

Next, inspect the linear guide rail and runner block assembly on the same axis. CKK modules integrate the guide rail and ball screw into a single housing, but adjacent axes or parallel guide systems may use separate Bosch Rexroth BSHP or BSSP runner blocks that require independent lubrication and wear assessment. Check the lubrication nipples and centralized lubrication lines — blocked or degraded lube lines are a leading cause of premature ball screw and guide rail failure.

On the electrical side, inspect the servo drive unit — typically a Bosch Rexroth IndraDrive Cs or IndraDrive Mi series drive — for fault history, DC bus voltage stability, and regenerative resistor condition. A drive that has been logging position deviation faults may have been masking a deteriorating actuator for weeks before the mechanical failure became visible. While the cabinet is open, verify the condition of the 24 VDC control power supply module feeding the drive enable and brake circuits; an undersized or aging power supply is a common source of intermittent drive faults that are misdiagnosed as actuator problems.

Check all limit switch and home position sensor wiring along the actuator travel path. Damaged cable carriers or loose connector pins on proximity sensors can cause false limit trips that stress the mechanical end-stops. If the system uses a Bosch Rexroth IndraDyn or third-party linear encoder for closed-loop position feedback, verify encoder head alignment and signal cable shielding integrity. Finally, review the safety relay module or safety PLC I/O card responsible for the axis enable chain — a degraded safety relay contact can cause nuisance shutdowns that are often blamed on the actuator or drive before the relay is identified as the root cause.

Strategic Replacement Solutions

The CKK 20-145 RFS-05C 0100-35119 is a direct OEM replacement for any existing CKK 20 series installation with a 145 mm stroke and 5 mm lead ball screw. Because Bosch Rexroth has maintained dimensional consistency across CKK generations, this unit can replace older CKK 20 variants without modification to motor mounts, cable carriers, or end-stop hardware in the vast majority of installations.

For facilities managing aging Bosch Rexroth linear motion systems — particularly those originally commissioned in the 2000s or early 2010s — the strategic value of this spare goes beyond a single repair event. Many older CKK installations are approaching or have exceeded their rated ball screw service life, which Bosch Rexroth typically specifies in terms of dynamic load capacity and travel distance rather than calendar time. Proactively replacing actuators that are approaching end-of-life during scheduled maintenance shutdowns, rather than waiting for in-service failure, is the single most effective way to protect production continuity.

Stocking one or two units of the CKK 20-145 RFS-05C 0100-35119 as a critical spare also supports multi-machine facilities where the same actuator model is deployed across several identical production cells. A single spare can serve as a rapid-swap unit for any cell in the facility, reducing the minimum spare inventory required while maintaining full coverage. This approach is particularly effective when combined with a documented actuator rotation and re-lubrication program that extends service intervals and provides early warning of wear before failure occurs.

All units shipped from TOPNLMS are functionally tested prior to dispatch. Each actuator is verified for smooth ball screw travel across the full stroke, absence of binding or abnormal resistance, and correct mechanical preload. Units are packaged in protective foam with end-cap protection to prevent transit damage to the ball screw nut and guide rail surfaces.

Support FAQ

Q1: Is this an original Bosch Rexroth part or an aftermarket replacement?
This is an original Bosch Rexroth CKK series actuator sourced through authorized industrial supply channels. It is not an aftermarket, remanufactured, or compatible substitute. The part number 123CM CKK 20-145 RFS-05C 0100-35119 corresponds directly to the Bosch Rexroth OEM specification.

Q2: What does the 12-month warranty cover, and how is it validated?
The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. Every unit undergoes a full functional test — including stroke travel verification and preload check — before shipment. A test report is available upon request. Warranty claims are processed through TOPNLMS directly; contact [email protected] with your order number and fault description.

Q3: Can this actuator replace an older CKK 20 variant with a different sub-suffix?
In most cases, yes. Bosch Rexroth has maintained dimensional compatibility across CKK 20 series generations. However, we recommend confirming the motor flange interface (RFS vs. RFN), ball screw lead, and stroke length against your existing installation before ordering. Our technical team can assist with compatibility verification — contact us with your existing part number or machine documentation.

Q4: How should I plan my spare parts inventory for CKK series actuators?
For facilities with 3 or more CKK 20 axes in continuous production, we recommend maintaining at least one spare unit on-site. For single-axis installations in critical processes, a spare-on-shelf strategy eliminates the 2–6 week lead time risk associated with emergency procurement. TOPNLMS offers volume pricing for multi-unit spare orders — contact us for a quotation tailored to your maintenance budget and machine count.