Locking washer NLDP series

roundcarbon steel

■Principle of washers for loosening prevention Washers for loosening prevention have wedge-shaped cams on the inside and radial ribs on the outside. 2 of these washers form a single pair. The cam angle（α）is set larger than the thread lead angle（β）. When a force acts to loosen the bolt, the cams of one washer press the cams of the other washer up and away, however due to the wedge effect the washers do not separate by more than the thread pitch. ■Installing correctly 2 washers are delivered as a single pair, with adhesive already applied. Before reusing these washers, check that the raised parts have not been crushed and that there is no cracking. Then use in accordance with the correct installation method shown in the figure at right. Remove any other washers or similar items before using these products. ■Precautions for repeated use NLDP can be used repeatedly.At this time, be sure to use lubricating oil. ■Allowable temperature limit The maximum allowable temperature for NLDP is 200℃. Do not use these washers at temperatures above this limit. ■Graph of vibration test results（reference） Tester: Yanker type vibration tester Loosening prevention washer used: NLDP8 Amplitude: ±0.5mm Bolt used: M8（strength class 12.9） Frequency: 40 Hz Clamped material used: Equivalent to S20C（28HRC）