Standard, USS, Narrow, Large Outside Diameter, Oversized
Steel, Alloy Steel, Stainless Steel, Nylon, Phenolic Resin
20 mm, 9.5 mm, 11.1 mm, 4 1/2", 45 mm
6.5 mm, 0.625", 1.172", 3.125", 0.078"
5.8 mm, 0.28 mm, 0.5 mm, 0.8 mm, 2.5 mm
ASME B18.8.1, BS 4320G, BS 4320B, BS 4463, ASME B18.21.1