HEYCO Products, represented by NPA , created the term "Double D" as product specifier or installer shorthand. It refers to a circular electrical housing and chassis mounting and cord opening with two opposing flat surfaces.
The Double D does double duty. It securely holds electrical wire and cord sets, concurrently sealing the chassis openings.
Now, the Double D Lockit also prevents a strain-relief bushing or plug from allowing a wire or cord set to dangerously rotate inside an electrical chassis or housing.
With the advent of the Double D Lockit, Heyco has introduced the next generation in strain-relief bushings: ones which fit existing compact Double D openings, and employ new safety features from Heyco's Lockit line.
Heyco's Double D Lockit design allows wire or cord set to be clamped securely within a strain-relief bushing, installed into a mounting panel at a remote location, pulled through safely or installed at a later step in the housing assembly process.
The Double D Lockit is an evolutionary new double-duty strain-relief bushing. It seals electrical housing and chassis mounting and cord openings.
At the same time, it provides lasting strain-relief against wire or cord set twisting, pulling or the forces of gravity in large and small appliances, power tools, consumer and industrial electronics, motor housings and lighting fixtures; any electrical assembly prone to the stresses of pull, push or twist, requiring UL-listed strain-relief.
The bushing is designed to fit into standard Double D openings. Flat sides at both ends of the bushing prevent the Lockit from turning in the opening. This protects current-carrying wires from twisting and from other natural or inadvertent stresses that can cause electrical failure.
It easily snaps into place without need for any tools, adding to installer comfort and safety while reducing assembly time and cost. The strain-relief has a five-step locking mechanism covering chassis ranges to 3.2mm thick. Sizes are available to fit cords ranging from 5.5mm to 11mm diameters.
Double D Lockit locks into place directly onto cords without need for chassis insertion, allowing it to be preassembled onto cords at the shop or jobsite, for additional time and cost efficiency.
The bushings are precision-moulded in high-impact Type 6/6 nylon and have a flammability classification of UL 94V-2 that withstands temperatures up to 125°.
An array of standard colours, and custom matches, is available.