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"The Model 15T/H Accu-Coder® is a Low profile 38.1mm diameter Encoder with commutation and multiple flex mounts.

Features
Very high performance economical encoder
Low profile—25.4 mm height and 38 mm diameter
Thru-bore with sizes up to 10 mm
Simple, innovative flex mounting system (Global Mounting Standards)
Up to 12 pole commutation optional for brushless motor control"
"The Model 15T or 15H Accu-Coder® offers a high performance feedback solution in a low profile package. Unlike modular or kit encoders, the Model 15 utilizes an integral bearing set and an innovative flexible mounting system which are much more tolerant to axial ­misalignment or radial shaft run-out. The slotted flex mounts provide 20 or 30 degrees of rotational adjustment for commutation or index pulse timing. Installation is quick and easy—for brushless servo motor applications, three 120° electrical phase tracks can provide up to 12 pole commutation feedback. The optional 100° C and 120° C temperature options allow servo motors to operate at higher power outputs and duty cycles. The Model 15 provides stable and reliable operation and is an excellent replacement for other ­manufacturers’ modular encoders where a high performance solution is desired.
You can also order the Appropriate Mounting and Installation Kit for SB, SC, and SD options. Choose standard or metric measurements. These kits work for SB, SC, and SD flex mount options. Each kit contains 10 screws for mounting 5 encoders.
Stock #176150-01 Standard Installation Kit, 4-40 buttonhead screws with 1.5mm shortened hex wrench
Stock #176149-01 Metric Installation Kit, M2.5 buttonhead screws with 1.5 mm shortened hex wrench"