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Internal tooth lock washers are hardened, circular washers with twisted prongs or "teeth" extending inward from the inside edge. The internal "teeth" are used to prevent nuts and bolts from loosening, or backing out, caused by vibration and/or corrosion. These have a zinc-plated finish.
From the Manufacturer
Internal tooth lock washers are hardened, circular washers with twisted prongs or "teeth" extending inward from the inside edge. The internal "teeth" are used to prevent nuts and bolts from loosening, or backing out, caused by vibration and/or corrosion. These have a zinc-plated finish.
Charles W.
Reviewed in the United States on November 3, 2015
The picture doesn't quite do the product justice. These are made of a shiny stainless steel so it looks shiny and not gray (it's hard to take a picture of shiny items). This fits under the head or nut of a number 6 machine screw to slightly bite into the material it's screwed into and the screw or nut - this gives a good electrical contact between the fastener and the item it's attached to even if the item is anodized or painted (as long as the paint is a no thicker than a reasonable thickness, and not house paint). It also gives a non-slip grip that reduces the possibility of the screw or nut loosening up. I personally prefer the internal tooth type like this over the external tooth type because that leaves just the round outside part showing when installed instead of the teeth - which to me is more visually pleasing.These seem to be well made and I prefer the stainless construction over a plated steel as it is less prone to corrosion.
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