The Square D XUFN01321 is a plastic fiber optic cable designed for use with diffuse photoelectric sensors. It runs 6.6 ft (2 m) from the sensor head to the amplifier, with a pair of 0.02 inch diameter fibers terminating in a threaded sensing tip. The polyethylene jacket and 0.39 inch bending radius let it snake through tight cable trays or along machine frames without kinking.
The 0.89 inch sensing distance applies to a standard diffuse reflective target. The threaded tip and straight viewing angle allow bracket mounting. The 0.04 inch jacket OD fits most fiber optic amplifier clamps.