From Stanley Engineered Fastening - Spiralock
Managers and engineers are understandably hesitant to change familiar production practices, but benefits to the bottom line through better joint integrity as well as streamlined assembly and maintenance are proving to be strong motivators in a range of industries, which are rapidly adopting a unique thread form with exceptional resistance to shock, load, and vibration. Production changeover to the thread form, offered by Madison
Heights, Mich-based Spiralock Corp., is quick and seamless, usually requiring just an exchange of traditional nuts, taps, and wire inserts.
"In our industry, prevailing torque nuts are standard, but problematic in certain applications," explains Greg Copeland, Senior Project Engineer for Hendrickson Trailer Suspension Systems, an operating unit of Hendrickson International, and the world's largest supplier of air ride trailer suspension systems. "We'd heard of the Spiralock thread form and were intrigued by it, but were resistant until we finally justified it by cost and function. In the end, it was an elegant solution."
Products & Services
Locknuts are a type of prevailing-torque fastener that resists loosening under vibration and torque. They differ from standard nuts because they typically have friction-increasing bearing surfaces (e.g., pitted grooves on flanges) or special internal thread-geometries.
Captive fasteners are designed for permanent retention within their target assembly or housing, often even upon servicing, providing a secure joint and avoiding loss or damage that might be caused by a loose part.
Threaded inserts are blocks of material with a threaded hole that are pressed or molded into a part, usually made of a different material.
Nuts are a type of hardware fastener with a tapped inner diameter. They are used with a mating threaded bolt or rod to secure components. There are many sizes and varieties of nuts; each with a particular fastening purpose. Some nuts can be applied without tools, and others may have special designs to prevent the nut from loosening.
Topics of Interest
A special thread form keeps bolts and nuts tight under vibration by attacking the problem from a different angle. A photoelastic image of the Spiralock 30° wedge ramp (right) shows loads are...
Whether the challenge is getting a bearing adapter to reliably withstand tremendous force in a U.S. locomotive bogie frame, retrofitting Chinese track to handle a doubling of train speed, or cutting...
Threaded and nonthreaded conventional plastic fasteners have the same dimensional thread class and fit standards as those for metal fasteners. Sizes range from 00 to in. in diameter and in lengths up...
Inserts are classified as two general types: those held in place by external threads and those that use some means other than threads (knurls, grooves, interference fit) for their holding power.
Threading is a machining process used to produce a helical groove of a given shape and size, usually on a cylinder (straight thread), or on a cone (tapered thread). The major purpose of...