US Digital E5-5000-315-IE-S-H-D-B optical encoders
5000 cpr
8.0mm bore size
index
single-ended output
through-hole cover
default base

These were used in an R&D project but determined that we need a different encoder for the application.  They are in excellent used condition, practically new.

These are $78.46 new from US Digital.

From US Digital:

The US Digital E5 motor encoder mounts directly to a motor or other rotating shaft. This optical encoder features a rugged, glass-filled polymer housing and is designed for easy installation and removal.

The E5 encoder contains a precision machined aluminum hub with a specially patterned Mylar disk. This disk, in combination with our proprietary optical encoder module, creates a system that is highly tolerant to mechanical misalignment. 

The E5 is a versatile motor encoder, with four base configurations and three cover styles which allows it to fit a wide range of applications. This optical rotary encoder also has four available outputs—single-ended, single-ended High-Voltage, differential, and Avago differential. This incremental encoder is designed for use with a secure latching connector—connector/cable sold separately.