Mil-Spec, Standard, SAE, Large Outside Diameter, USS
Nylon, Phenolic Resin, Brass, Alloy Steel, Titanium
20 mm, 2 3/16", 1 37/64", 15/16", 2 3/4"
0.375", 0.563", 0.75", 0.875", 1.125"
NL-19, Plain, Armor Coat, Black Oxide, Zinc Yellow
9/32", 4.6 mm, 0.35 mm, 3.3 mm, 5/64"