What makes Spiralock self locking threaded fasteners unique is the 30-degree wedge ramp at the root of the thread which mates with standard 60-degree male thread fasteners. The wedge ramp allows the bolt to spin freely relative to female threads until clamp load is applied. The crests of the standard male thread form are then drawn tightly against the wedge ramp, eliminating radial clearances and creating a continuous spiral line contact along the entire length of the thread engagement.
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