https://www.superiorwasher.com/washers/9212/Belleville-Spring-Steel.html
This video clip talks about a specific type of washer known for its reliable deflection or added shock absorption. Belleville spring steel washers are a fastening assembly that comes with the natural and flexible strength of spring steel which allow the washers to deflect. These are the stackable type of washers with enhanced shock-absorbing properties as they are stacked one over another.
Belleville spring steel washers are used in various industrial applications where flexible strength and durability are required.
I built a mailbox post about 12 years ago which worked great until a snow plow snapped it in half. So I decided to make a new post, and video the process. Our mail box is a large T3 rural type. If you have a smaller, more common T1 size mailbox, the design can be easily modified. This is a not to hard DIY project. I show you how to do it. I used a 10 foot pressure treated 4×4 post, and some galvanized bolts, nuts and washers. That’s about it. The power tools I used were a 7 1/4″ circular saw and a drill. I could have used my DeWalt miter saw, but I decided to keep it simple.
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