Metric High-collar split lock washers are specifically designed to reduce the loosening of fasteners from their matching assembly. The high-collar (hi-collar) version of these washers is taller and designed, specifically, for use with socket cap screws. The spring tension of these washers prevents loosening by creating pressure against a fastener's threads and its mating part. They are available in steel, stainless, and can be fabricated in other metals. They are available in standard and metric sizes.

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