Mil-Spec, Standard, Narrow, SAE, Large Outside Diameter
Titanium, Nylon, Phenolic Resin, Alloy Steel, Stainless Steel
40 mm, 19 mm, 44 mm, 3 3/4", 2 1/2"
16.5 mm, 1.172", 15 mm, 2.625", 0.078"
5.8 mm, 1.2 mm, 8.1 mm, 0.8 mm, 0.28 mm
DIN 127B, ASME B18.22.1
ASTM F844, BS 4320, DIN 7603A, BS 4320B