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High Collar Lock Washers

Extra Thick Split Ring Lock Washers

High Collar lock washers are designed to fit under the head of a socket cap screw. A split washer or a spring lock washer is a ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener's head and the substrate. The exerted force helps adds resistance to the nut or bolt making it harder to loosen. High Collar lock washers are primarialy used where fasteners are likely to vibrate.

Applicable standards are ASME B18.21.1, DIN 127B, and United States Military Standard NASM 35338 (formerly MS 35338 and AN-935).

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Trade Names: High Collar Spring Washer, High Collar Split Washer