Zero Backlash Miniature Helical Couplings

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

Hicksville, NY -- These miniature helical couplings feature zero backlash, no maintenance, no vibration, and smooth bearing loads, even at misalignments of 3° angular positions. These couplings, identified as the S54MHCM... Series are stocked in 30 different sizes ranging from 4 mm to 12 mm.

Made of 7075-T651 aluminum, these couplings range in O.D. sizes from 19.1 mm to 31.8 mm and in lengths from 28 mm to 58 mm and have a maximum speed of 5000 rpm. They are extremely lightweight, ranging from approximately 22 grams to 60 grams. They can be used in precision engineering applications and are especially capable of accommodating tight or skewed connections.

SDP/SI - 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