BEI M25D-X-H3600B2-XD5-X-S-C25-X-5 25 Pin Encoder

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BEI M25D-X-H3600B2-XD5-X-S-C25-X-5 is a heavy-duty absolute optical rotary encoder (Size 25 / 2.5" diameter package) manufactured by BEI Motion Systems / BEI Electronics (now under Sensata Technologies / BEI Sensors).

Key Characteristics

• Type: Absolute position encoder (provides a unique digital code for each shaft position; no homing required after power-up).
• Housing / Mounting: M25D series — 2.5" diameter with square flange (D configuration). Rugged die-cast aluminum construction typical of BEI industrial encoders.
• Resolution / Code: The “H3600B2” segment indicates a high-resolution absolute configuration (commonly Gray or natural binary code in the M25/H25 family; exact bit depth and code type are configuration-specific).
• Connector: 25-pin (C25) for parallel absolute data output, plus power and control signals (common on higher-bit absolute models in this family).
• Other indicators in the model string:
• X / special options and output formatting (XD5, etc.).
• S = special features or sealing options (consult factory for exact details).
• Final -5 often relates to voltage/output or revision level.
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Typical Specifications (M25 / comparable H25 absolute family)

These encoders generally share the industrial-grade mechanical and electrical characteristics of BEI’s Size 25 line:

• Shaft: Usually 3/8" stainless steel (flat optional).
• Bearings: Precision ABEC-class, high load capacity.
• Environmental: Designed for industrial use (EMI shielding, optional shaft seals for NEMA/IP ratings).
• Supply: Typically 5–28 VDC range.
• Applications: Machine tools, robotics, material handling, process control, positioning systems, and other industrial automation where absolute position feedback is required.

Exact electrical pinout, resolution (bits or counts), output code (Gray/Natural Binary), voltage levels, and any special options are defined by the full model string and should be confirmed with the original datasheet or BEI/Sensata support, as many M25 units were built as custom or special-order configurations.

This is a robust industrial absolute encoder intended for demanding environments rather than light-duty or consumer applications.

Note to buyer:

1. Review all photos carefully as they are part of the description per eBay policy.
2. Items sold as new, tested, and or working may be returned within 30 days of receiving if not satisfied with purchase (restocking fee may apply). Buyer is responsible for return shipping costs.
3. Items that are untested, for parts or repair, or unknown condition are sold as is and are non-returnable.
4. Items are sold as pictured. If it is not shown in the pictures it doesn't come with the item (i.e. power cords, attachments, tooling, etc.)
5. !! Most listings at the end include a GH and then a number for example ( GH119 ) OR ( A19 ) it is a internal stock reference number and not part of the items description Thanks GearheadSurplus !!

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