Stainless steel washers are applied in fastener assemblies to distribute pressure from the head of a bolt across a wider surface area. As a bolt is tightened more pressure is placed against the washer instead of the installation material. Washers can help to prevent pull-through, as well as, damage on soft materials.
Stainless steel washers can also act as a flush surface for a bolt head or nut to tighten against. While not their intended function they can be used as spacers to shorten bolt lengths. They come in many varieties that have different functions, one example is a lock washer. A stainless steel lock washer holds a fastener assembly in place to prevent accidental loosening due to vibrations or other external forces.
Washers made from stainless steel are also corrosion and rust resistant. Each grade has a different environmental range. Due to the metals natural resistance to corrosion and rust, accidental burring of the washer will not compromise its performance.
The Many Types of Stainless Steel Washers
Stainless Steel Washer Varieties Transcript
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Bob: Welcome back to Albany County Fasteners - Fasteners 101. I'm Bob and today we're going to discuss washers. Let's get started.
I wanted to show you the difference and different types of stainless steel flat washers we have here.
This is a standard flat washer. Right here. And this is a military flat washer. Military Flat Washers come in many different sizes. Those all fall under military spec. So they're going to be larger, smaller, all kinds of different specs that the military requires. You can use those for any of your applications but they're mostly used in military applications.
This is an NAS national aerospace washer. A lot of these washers are very small washers in size.
This is an AN 900 series. I believe there is a 900 series and also an 800 series. They're in all kinds of different diameters, as far as washers in AN.
And then we have the rivet backup washers. The rivet backup washers come in different sizes for #6 and #8. The same as the hat on a on rivet.
Also in stainless we have the extra thick fender washer. We have the standard fender washer. We have the metric stainless washer. Which is standard. And we have the extra thick standard stainless washer.
And of course we're going to throw in here the lock washers. High collar, which is that one there, and the standard lock washer. We have stainless finishing cup washers and of course we have the internal and external lock washers.
And last is a 316 stainless flat washer. How you determine it's a 316 stainless washer, along with hex cap screws and nuts, is that everything 316 is going to be marked with a 316 on the product to show you that it's 316. So if you go out there buying 316, look for the marks. The markings will tell you that you actually have 316. If you don't find the marks, then you don't have 316. The only thing that I can tell you that does not have a 316 stainless marking on it would be a lock washer. That's the only item that I am aware of that doesn't have that marking.
There you go.
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