Precision Rectangular Ground Racks/Joining Gauges

Product Announcement from Stock Drive Products & Sterling Instrument - SDP/SI

Hicksville, NY -- This ISO class series of 5 rectangular ground racks and joining gauges are available from Stock Drive Products / Sterling Instrument in Modules 0.5, 0.8, 1, 1.5, and CP 2 and 5. Gear racks are used to convert rotational motion into linear motion. In theory, a rack is an unrolled gear with an infinite pitch diameter. A rack will mesh with all gears of the same pitch.

The Module 0.5, 0.8,1 and 1.5, are identified as the S18C -- M series and the CP 2 and CP 5 are known as the S18CCPM series. Both series are available with machined ends that allow them to be joined together to create continuous lengths of rack. The spacing of these mating racks is achieved by the use of the new joining gauge. The joining gauge is a section of rack that is bridged over the two adjoining racks for precise alignment while attaching the rack to your application.

These standard components are made from ANSI 1045 steel with a tooth surface induction hardness of HRC 27-32. Stock racks are available in lengths of 200 to 300 mm, and from 64 to 128 teeth. There is also a family of round racks available in module 0.5, 0.75, 0.8 and 1 in ISO class 9 in 304 stainless steel. They are identified as the S181YYM Series and are offered in lengths of 202 mm and 305 mm.

SDP/SI is a leading manufacturer of small mechanical components, servicing a wide variety of aerospace, medical and commercial industries for over 50 years.

Stock Drive Products / Sterling Instrument offers both inch and metric small off-the-shelf mechanical components for the design engineer. Thousands of stock components, in a wide variety of sizes can easily be located and purchased in one convenient place. The engineer not only meets all his component requirements, but saves valuable time by not having to search other sources. SDP/SI is your one-stop source for small mechanical components. Stock Drive Products / Sterling Instrument consistently provides high quality precision gears and gear assemblies in quantities for prototype to OEM’s. We make what others can’t.

Quotes, online orders, and 3D CAD models are available on our updated estore at

SDP/SI is a brand of Designatronics Inc.,  

Designatronics, Inc.
250 Duffy Avenue, Hicksville, NY 11801.
Phone: +1  516-328-3300