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The Cassette Indexer Shield Bearing (AMAT OEM P/N 3060-90279) is a small but precision-critical rolling-element bearing fitted to the cassette indexer assembly of Applied Materials (AMAT) ion implantation platforms. Within the wafer-handling front end of a Quantum or xR-class implanter, the cassette indexer is the mechanism that raises, lowers and laterally positions the wafer cassette so that the end-effector robot can extract and return wafers slot by slot. This particular bearing supports the side-adjustment axis of that indexer, allowing the cassette stage to be aligned and shifted along its lateral travel without binding or backlash.
The descriptor “shield bearing” identifies it as a shielded ball bearing, a sealed-shield construction in which thin metallic shields are fitted on one or both faces to retain lubricant and exclude particulate contamination. In a high-throughput implanter, where the cassette indexer cycles continuously through load and unload operations, this shielding earns its place: it keeps the rolling raceway clean in an environment where any liberated particle can travel to a wafer surface and cause a yield-killing defect. The “Bandler side adjustment” terminology refers to the side-positioning sub-assembly of the indexer handler, the portion of the mechanism responsible for cross-axis alignment of the cassette relative to the robot pick line.
Although physically modest, the part sits squarely in the reliability path of the tool. A worn or contaminated indexer bearing introduces position error, vibration and audible roughness into wafer handling, precisely where the implanter can least tolerate it. Sourcing a correct, form-fit-function equivalent quickly is therefore central to keeping a fab’s implant cluster running at availability.
The shield bearing provides low-friction, low-runout rotary or linear-guide support for the side-adjustment motion of the cassette indexer, enabling repeatable cassette positioning ahead of every wafer transfer. Its core functions include:
As a shielded precision bearing, the part is selected for tight running accuracy rather than heavy load. The cassette indexer carries a populated wafer cassette plus its carriage, a modest static and dynamic load, but it demands very low runout and consistent torque so that slot-to-slot positioning stays inside the robot’s acceptance window. Key mechanical characteristics include:
The shielded design is the feature that makes this bearing suitable for a wafer-handling environment. The shields retain factory grease and resist its migration, while keeping airborne and self-generated particulate out of the rolling contact. This matters because the bearing operates close to the wafer pick line, where contamination control is paramount:
Because the cassette indexer feeds every wafer into the implant flow, the health of its side-adjustment bearing has consequences well beyond the bearing itself:
After years of continuous indexing, the retained grease eventually breaks down or migrates, leaving the raceway under-lubricated. The result is rising torque, audible roughness and accelerated raceway wear, which the tool may flag indirectly through motion or following-error faults on the indexer axis.
If a shield is dented during handling or service, or if its lubricant film fails, particulate can enter the rolling contact. Contaminated bearings generate their own debris in a worsening cycle, raising both bearing noise and particle counts in the cleanroom-critical wafer-handling zone.
The repeated start-stop, short-stroke motion of a side-adjustment axis can locally indent the raceway over time. The resulting play introduces backlash into the side-adjustment mechanism, degrading positioning repeatability and presenting cassette slots inconsistently to the end-effector.
Replacement should be carried out by a qualified service technician following AMAT procedures for the specific tool. The following sequence outlines the typical approach:
Small consumable bearings like this are easy to overlook in a spares plan, yet their failure can idle a high-value implant tool. Holding a verified replacement on the shelf protects availability. Sourcing through ESCT Fab Support offers several advantages:
It supports the side-adjustment axis of the cassette indexer in the wafer-handling front end, providing smooth, low-runout motion so the cassette is positioned accurately for every wafer pick and place by the robot end-effector.
No. This bearing is supplied as a new OEM-compatible replacement that has been verified to the form, fit and function of AMAT OEM P/N 3060-90279. It is not an original OEM-branded part and is offered as an equivalent alternative.
“Shield bearing” denotes a shielded ball bearing fitted with metallic shields that retain lubricant and exclude particulate. In a cleanroom wafer-handling zone, this construction protects both the bearing’s running life and the cleanliness of nearby wafers.
Typical indicators are increased indexer noise or roughness, rising servo following error, intermittent robot pick faults, or positioning repeatability problems on the side-adjustment axis. Any of these warrants inspection of the bearing during the next scheduled maintenance window.
The typical lead time is approximately one month. Because the part is a small wear item whose failure can stop a complete implant tool, many fabs choose to hold one on the shelf as planned spares insurance.
Yes, by a qualified service technician following the correct AMAT procedure for the tool, including proper lockout, clean handling and pressing the bearing on the correct race. After fitting, the indexer should be homed and test-cycled to confirm repeatable positioning before returning to production.
The Cassette Indexer Shield Bearing (AMAT OEM P/N 3060-90279, ESCT P/N ES3033-024) is a precision shielded ball bearing supporting the side-adjustment axis of the cassette indexer in AMAT Quantum and xR-class ion implanters. Though small, it directly governs the accuracy, smoothness and cleanliness of wafer handling at the load section. Worn or contaminated bearings cause mispositioning, motion faults and particle risk, making a verified, readily available replacement a sound investment in tool availability. ESCT Fab Support supplies this part as a form-fit-function equivalent with clear cross-referencing and a typical one-month lead time.
Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Applied Materials part number 3060-90279. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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