Timken vs. SKF Bearings: The Difference Between Tier-1 Bearing Brands
When sourcing a replacement bearing, you will often find both Timken and SKF options for
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FANUC spindle orientation PCB for AC spindle servo drive units (6055 / 6059 series), drawing revision 0204A. New old stock, made in Japan.
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| MFR / Brand | FANUC |
|---|---|
| MPN | A20B-0008-0243 |
| Model | A20B-0008-0243/0204A |
| Advertise | 1 |
|---|---|
| Condition | New – Open box |
| Type | Circuit Board |
| Base Number | A20B-0008-0243 |
| Industry Terms | spindle orientation board; orientation PCB; spindle orientation card; FANUC spindle drive board; A20B board; CNC spindle control board; spindle positioning PCB; AC spindle servo board |
| Common Misspellings | A20B 0008 0243; A20B00080243; A20B-008-0243; A20B-0008-243; Fanuk A20B; Fanac A20B; Funuc; GE Fanuc A20B-0008-0243 |
| Application Types | CNC machining centres with automatic tool change; CNC lathes and turning centres; legacy FANUC AC spindle drive repair; machine-tool spindle orientation retrofits |
| Condition Note | Made In Japan, New Old Stock |
| Mpn Variants | A20B-0008-0243; A20B00080243; A20B-0008-0243/0204A; A20B-0008-0243-0204A; A20B 0008 0243 |
| Manufacturer Status | Legacy / obsolete - no longer manufactured; supplied as new old stock |
| Compatible With Replaces | FANUC AC spindle servo drive units, 6055 and 6059 series |
| Additional Attributes | Board function: spindle orientation control (commanded angular stop position and hold); Board family: FANUC A20B printed circuit boards; Host equipment: FANUC AC spindle servo units (SPM); Documented drive units: 6055 and 6059 series; Production era: 1980 to early 1990s; Drawing revision: /0204A; Signal role: processes spindle encoder feedback and stop-position signals; Country of manufacture: Japan; Supply note: no longer manufactured - available as new old stock or tested exchange; Revision sensitivity: confirm stamped part number and revision before fitting |
| Part Number | A20B-0008-0243 |
| Cross Reference 1 | A20B-0008-0243/0204A (drawing revision) |
|---|---|
| Cross Reference 2 | A20B00080243 |
What this part is:
The FANUC A20B-0008-0243 is a spindle orientation printed circuit board used in FANUC AC spindle servo drive systems.
Boards of this vintage are no longer manufactured, so new old stock and tested-exchange units are the normal supply route for keeping legacy machine tools running. Made in Japan, new old stock.
What these specs mean in practice:
Its job is spindle orientation control – bringing the spindle to a commanded angular stop position and holding it there, which is what allows automatic tool change, boring-bar indexing and keyed workholding to repeat accurately. The board processes spindle encoder feedback and stop-position signals within the drive unit rather than driving the motor itself.
Interchange guidance:
It is documented against FANUC AC spindle drive units of the 6055 and 6059 series from the 1980s through the early 1990s, and this example carries drawing revision /0204A.
Because FANUC used revision-specific hardware across drive generations, confirm the full part number and revision stamped on the board you are replacing before fitting.
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