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Shaftloc Components Miniature Fairloc Bellows Couplings SDP/SI your go-to source forAerospace

Setting Ideas into Motion

SDP/SI - Stock Drive Products/Sterling Instrument provides mechatronic based design, engineering and manufacturing services for industrial and commercial applications.

Celebrating 55 Years of Providing Product Solutions

For 55 years design engineers have depended on SDP/SI for high-quality components, subassemblies, and engineering expertise. As a company founded and managed by engineers we understand and respond to the developing needs of our customers better than anyone. Over 130,000 inch and metric dimensioned components are available for fast turnaround. When a standard product won't meet your requirements we can provide alternative solutions through custom design and manufacturing. Our engineering and manufacturing teams will partner with you throughout the entire process. By providing design, development, manufacturing, assembly, and testing in one location we can ensure the end product will meet your expectations.