Even though the outer diameter dimensions are exactly the same, did it bottom out and lock when replaced? A thorough explanation of the operating mechanism of linear bushes: "infinite stroke vs finite stroke."
Even if the shaft diameter and outer diameter match perfectly, differences in the internal mechanisms can lead to severe vibrations or locking (seizing) during the middle of the stroke if misidentified.
HWLB-001 (Linear Bush Type - Infinite Stroke): This model features steel balls that continuously circulate within the track. It uses a POM holder, which excels in low noise and vibration absorption, making it ideal for general long-stroke linear reciprocating drives. The black resin holder is visible on the end face.
HWLB-019 (Stroke Bush Type - Finite Stroke): In this model, the steel balls do not circulate, and the aluminum holder moves at half the shaft speed. While it has a maximum stroke limit (approximately 12 to 46 mm), it supports low friction and "linear + slight rotation," making it optimal for high-speed pressing and precision coating. Exceeding the tolerance can cause holder damage or shaft wear.
[Appearance Identification and Environmental Compatibility]
The appearance can be quickly identified by the holder on the end face (whether it is black resin or metallic aluminum color). For rust prevention and clean room environments, the all-metal HWLB-019 (SUS440C specification) is recommended to minimize dust generation.

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