This line of spiral retaining rings can operate in an internal and an external groove at the same time. They boast many benefits for the ID/OD lock including concealed fastening, no required assembly tooling, and a 360-degree rotational capacity.

The rings can be installed in a housing groove. When the mating component in the assembly is added, the ring compresses into the groove. When the grooves meet, the ring snaps into the shaft groove while still in the housing groove.

Smalley Steel Ring Co., 555 Oakwood Rd., Lake Zurich, IL 60047. 847-719-5900. www.smalley.com.

Closed-Loop Quality Management Minimizes the Cost of Quality
Don Jasurda, Vice President, Dimensional Control Systems

Engineering, Freedom, and the 28th Amendment
Karl Stephens

Picking Glass Out of My Eyes
David Mantey, Editor, PD&D