The FANUC A20B-8200-025 is an encoder component used in compatible FANUC motor-feedback assemblies. Industrial spare-parts listings consistently classify this exact model as a FANUC encoder, but the complete motor and encoder configuration must be checked before replacement.

• 100% function tested before shipment
• Worldwide DHL, UPS and FedEx shipping
• Testing video provided upon request
• Contact us for availability and lead time

Product Details

Brand: FANUC
Part Number: A20B-8200-025
Alternative Format: A20B8200025
Product Type: Motor Encoder / Feedback Component
Primary Function: Detection of motor rotation for feedback control
Product Family: A20B-8200
Application: Confirmed compatible FANUC motor and control configurations
Availability: Contact us for current stock
Core Exchange: Subject to confirmation
Repair Evaluation: Subject to confirmation
Testing: Encoder feedback functions checked before shipment

Encoder Function

The A20B-8200-025 FANUC encoder forms part of a closed-loop motion-control system. It detects rotation within the original motor assembly and provides feedback used by the associated control equipment to monitor movement.

Replacement may be appropriate when technical diagnosis confirms defective encoder electronics, unstable feedback or physical damage. Before changing the encoder, check the feedback cable, connectors, motor-side mounting, servo amplifier and related control settings. Similar alarms can be caused by components outside the encoder.

Exact Number Confirmation

The correct product reference is A20B-8200-025. Multiple product and inventory records use this three-digit ending, confirming that it should not automatically be rewritten with a fourth digit.

A20B-8200-025 is not the same written model as A20B-8200-0250. Do not assume that A20B-8200-018, A20B-8200-019, A20B-8200-0250 or other similar encoder numbers are interchangeable.

Some reseller records group A20B-8200-025 with A860-0364-X004, while other listings associate A860-0364-X004 with a different A20B reference. Because the available evidence conflicts, A860-0364-X004 should not be advertised as an official alternative or direct substitute without confirmation from the original hardware or applicable FANUC documentation.

Compatibility Verification

Before ordering, confirm:

• Exact A20B-8200-025 marking
• Any additional PCB revision or identification number
• Complete motor model and specification suffix
• Encoder housing and mechanical mounting
• Connector type, orientation and pin count
• Feedback cable number
• CNC and servo-amplifier models
• Current feedback or servo alarms
• Front, rear and connector photographs

Publicly available documentation does not reliably identify the resolution, pulse count, absolute or incremental type, signal interface, connector pinout or supported motor series for this exact model. These specifications should be checked from the original encoder and machine documentation rather than inferred from another A20B-8200 product.

Replacement Note

Encoder removal can affect the machine’s established reference position. Depending on the control configuration, installation may need to be followed by parameter checks, reference-position recovery or an absolute-position setup procedure.

Replacement and recommissioning should be performed by qualified maintenance personnel with machine power safely isolated. Follow the applicable FANUC and machine-builder procedures before operating the axis.

Sales & Support

REACO CNC supplies tested FANUC A20B-8200-025 encoder components for CNC maintenance and motor-feedback restoration. Send us clear photographs of the original encoder, connector and motor nameplate for identification assistance.

Each supplied encoder is inspected and function tested before dispatch. Worldwide delivery is available through DHL, UPS and FedEx, and a testing video can be provided upon request. Contact REACO CNC for price, current availability and lead time.