DISC-LOCK International manufactures and sells world-wide many safe and durable fastening solutions for industry, transportation, military, and the windpower industry world-wide. For instance, the company’s Delta Protekt, a preassembled washer pair, is a heavy duty, structural self-locking fastener that prevents bolted joints from loosening by shock or vibration in high stress applications. It is ideally suited to many tasks in the windpower industry.

The DISC-LOCK Washer pair can also be used in either blind hole or through-hole applications. In blind-hole applications, the washer pair is placed under the bolt head while through-hole applications use the washers beneath a nut. The working principle behind the device is simple. It consists of two preassembled (glued) washer-shaped pieces. These have inclined cams on one side and a series of ridges on the other. On installation, the cam sides are mated and placed between nut and joint material. Under vibration, the nut tries to rotate loose but, as the angle of the cams is greater than the pitch angle of the bolt thread, the interlocking cams and the non-slip ridges of the washer work together to create a jamming effect which prevents loosening.

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