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Your cart is empty. These washers have cams or wedges on one side, with a lead angle greater than a thread angle, and radial teeth or ribs on the other side. The washers are installed cam face to cam face. When tightening the fastener to preload, the teeth penetrate and seat against the joint material and the nut and/or fastener head. When subjected to vibration the interacting cams create a wedge action which prevents the fastener from vibrating loose.
Vibration Proof Lock Washers
For Use With Grade 5 & Grade 8 Bolts
Zinc Plated
Material: Carbon Steel
Hardness: Through Hardened: Min. 44HRC, Max. 51 HRC
Bolt Size: 5/16? (8mm)
O.D.: 17/32?
50 (25 pair) Per Package
scott
2025-09-01 15:34:53
they work
Gun951
2025-06-09 11:57:33
Great product, I use them to keep CV axel bolts from backing out on a high powered turbo car, they work great, good quality too!
Thomas B.
2025-05-07 11:16:30
Too expensive
DMcy
2025-04-06 17:29:00
Worked as advertised. No Issues so far.
Cathy Cain
2025-03-16 16:20:21
Great price! Great product! would recommend this product to anyone! We use these a lot as well as the 3/8"!
Mark C. Brems
2025-03-14 18:31:53
Your nuts and bolts will never come loose again.
tom rommel
2025-01-24 16:48:44
The items i received worked fine however they were advertised as Nord Lock Vibration proof lock washers. The items supplied were manufactured by a company other than Nord Lock Inc.
Customer
2025-01-13 16:49:48
Learned about these at work and decided to get some for a kart racing engine that had issues with vibration loosening bolts. Have had mixed luck with them. One engine had held good and tight and the other still backed some bolts out. Thinking maybe I didn't get enough torque to hold the washers tight, but the bolts were torqued to the engine manufacturer's spec, which just may not have been enough for the washers, so not necessarily their fault.
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