Vacuum Parts & Controls — MDC SBLM-133-4 Linear Motion Vacuum Feedthrough wit 4” Travel and CF Flange (Bidservice)

How Much Does MDC SBLM-133-4 Linear Motion Vacuum Feedthrough wit 4” Travel and CF Flange Cost in 2026?

In 2026, the MDC SBLM-133-4 Linear Motion Vacuum Feedthrough with 4” travel and CF flange is typically priced between $350 and $350 for used or refurbished units in condition grade B. This price range reflects the average cost for a unit that has been professionally inspected and tested by vendors such as Ferrotec and Axus Technology. New units from Bidservice or authorized resellers can cost upwards of $800–$1,000, making used options a cost-effective alternative with savings of 40–60%.

The value of this part is especially high in environments where downtime costs exceed $1,500 per hour, such as in high-throughput wafer processing or vacuum deposition systems. A failure to source a replacement quickly can lead to extended production halts and lost revenue. However, it’s important to note that units with more than 10,000 operational cycles or signs of seal degradation should be avoided, as they may fail during critical operations.

MDC SBLM-133-4 Linear Motion Vacuum Feedthrough wit 4” Travel and CF Flange Specifications and Compatible Tools

The MDC SBLM-133-4 is a linear motion vacuum feedthrough designed for use in vacuum environments with a 4-inch travel range and a CF (ConFlat) flange interface. It typically operates at vacuum levels down to 10^-6 Torr and is built to withstand up to 10,000 operational cycles before requiring inspection or replacement. The unit is commonly found in older vacuum deposition systems and semiconductor tooling from the early 2000s, including models like the Varian 3000 and Leybold Heraeus systems.

This feedthrough is generally compatible with systems that use CF-40 or CF-63 flanges and require linear motion for actuation or positioning. However, it is not compatible with newer ISO flange-based systems or those requiring higher travel ranges beyond 4 inches. Attempting to force this part into an incompatible system may lead to seal failure, vacuum leaks, and potential damage to the chamber. In a production setting, this could result in a $2,000–$5,000 repair bill and several days of downtime.

What to Check Before Buying a Used MDC SBLM-133-4 Linear Motion Vacuum Feedthrough wit 4” Travel and CF Flange in 2026

1. Operational Cycle Count: Verify the number of cycles the unit has undergone. Units with more than 10,000 cycles should be rejected. Use a cycle counter or ask the seller for maintenance logs.

2. Seal Integrity: Perform a helium leak test to confirm vacuum integrity. A leak rate above 1 x 10^-8 Torr·L/s is a red flag. Also, inspect the O-rings and metal seals for signs of wear or cracking.

3. Flange Compatibility: Confirm the flange size and type (CF-40 or CF-63). A mismatch can lead to improper sealing and vacuum failure. Units produced before 2005 may have slightly different tolerances.

4. Actuator Performance: Test the linear actuator for smooth, consistent motion. Any binding or irregular movement may indicate internal wear or contamination. Reject if motion is inconsistent beyond 0.5 mm per cycle.

5. Production Year: Units produced after 2003 typically have improved sealing materials. Avoid units older than 2001 due to higher failure rates in long-term use.

A poorly inspected unit can lead to a vacuum breach during a critical process, potentially causing $3,000 in lost production and $1,500 in repair costs.

FAQ

Q: How does the MDC SBLM-133-4 compare to the SBLM-133-6 model?
A: The SBLM-133-6 offers a 6-inch travel range versus the 4-inch travel of the SBLM-133-4. The 6-inch model is typically $150–$200 more in the used market and is used in systems requiring greater linear motion, such as larger deposition chambers.

Q: Can I use the MDC SBLM-133-4 in a system with ISO flanges?
A: No. The SBLM-133-4 uses a CF flange and is not compatible with ISO flange systems. Using it in an incompatible system can lead to vacuum leaks and seal failure.

Q: How long can I expect the MDC SBLM-133-4 to last before needing service?
A: With proper maintenance and under normal use, the unit can last 8–10 years or up to 10,000 cycles. After that, it should be inspected or replaced to avoid failure.

Q: Should I replace the seals when installing a used MDC SBLM-133-4?
A: Yes. Even if the seals appear intact, they should be replaced every 5 years or 5,000 cycles to prevent vacuum leaks. Seal failure can cost up to $2,500 in downtime and repairs.

Q: What is the most common cause of failure in the MDC SBLM-133-4?
A: Seal degradation is the most common cause, followed by actuator wear. Units with more than 10,000 cycles or those stored in humid environments are at higher risk.