Shaft Clamps are standard on encoders.
Press Release Summary:

Original Press Release:
Shaft Clamps, Preferred By Most Users, Are Now Standard On EPC Encoders
SANDPOINT, IDAHO, April 18, 2002: Encoder Products Company (EPC), manufacturer of the popular Accu-Coder(TM) brand encoders, now offers shaft clamps on nine of its ten models of hollow shaft and thru-bore encoders, and at no increase in cost to the customer. Although more expensive to design and manufacture, a shaft clamp mounting mechanism has certain advantages over the more traditional set screw arrangement for mounting encoders: A shaft clamp grips all surfaces of the shaft evenly and is much less likely to slip in the presence of heavy vibration; a shaft clamp will not mar or score the shaft to which it is mounted like a set screw can; set screw mounting schemes can exaggerate any axial play in the motor shaft, decreasing long term reliability; and, in applications involving commutation, calibration is much easier.
All Accu-Coder(TM) brand encoders are manufactured to EPC's exacting standards to ensure the quality you've come to expect from the Accu-CoderTm brand. And, with EPC's exclusive three-year warranty, you can be confident your Accu-Coder(TM) will provide years of trouble free use.
For additional information contact EPC, PO Box 1548, Sandpoint, ID 83864, 800-366-5412, www.encoderproducts.com.