National Aeronautical Standard Flat NAS1515 series washer.
Made out of Plastic Polyhexamethylene Adipamide Overall.
Great product but they way it is listed does not correlate with their size. I needed washers for a 10-32 screw application so I ordered a -10. When I received them I found a -10 actually fits a 5/16 not a 10-32, As a result they were way to large for the intended application. Why isnt their size listed rather than a -10? If the -10 has no meaning why bother putting that into the description? Instead just put the ID, OD and thickness. The -10 means nothing to the buyer and as a result no one is the better for it.
NAS1515H08L is the thin version for a #8 and NAS1515H08 is the standard thickness. NAS1515H3 is the correct one for a #10.
NAS1515H4 NYLON WASHER dims are 1/4 id, 1/2 od and 1/16 thick.