Colony #2114-6 3/8 inch Chrome Plated Thick Flat Washers 6 pack – Lowbrow  Customs

Flat Washer - 2.000 ID, 3.125 OD, 0.050 Thick, Aluminum

Some Known Incorrect Statements About 18-8 Stainless Steel AN Flat Washers - Albany County Fasteners

Nevertheless, this term was later on changed with UNC, or Unified National Coarse, to correctly describe the thread design. However, lots of will still describe coarse threaded bolts as being USS and will also think that the USS flat washer is implied to be utilized with the 'USS' coarse threaded bolt. As we shall later see, this is not the case and is inaccurate for many applications. The USS flat washer was first established in the early 19th century for applications involving compressible products, such as wood, thin sheet metal, and so on. The outdoors size was large sufficient to supply a large surface location to prevent embedment of the bolt head into the material and lessen joint compression, while the within diameter was large enough to accommodate bolts with very loose tolerances for handmade bolts of that age.

For that reason, the smaller, more compact SAE flat washer was established and called after the Society of Automotive Engineers. The inside size of the SAE flat washer is much closer to the diameter of the size of bolt it is to mate with given that the bolts of today are all manufactured to close tolerances by device from cold forming to hot heading. The outside diameter of the SAE flat washer is also smaller as it does not need to offer a large load bearing area to avoid compression, as did the USS washer versus compressible materials. Figure 1 illustrates the dimensional differences in between the exact same internally sized flat washers: The USS flat washer is on the left, and the SAE flat washer is on the right.

The typical thought was to combine the USS flat washer with the coarse (USS) threaded bolt and the SAE flat washer with the great thread (SAE) bolt. This is not always the best situation to follow, particularly when using higher strength fasteners such as Grade 8 (10. 9) and even Grade 5 (8. 8), as this practice might eventually result in failures in high strength joints. PRODUCT STRENGTH For steel flat washers, there are 2 options: plain or hardened.  Try This  are not designated by grades, per se, with the exception of structural washers under the ASTM (American Society for Testing and Materials) Standard F436.