Product Name: API 20E BSL-1 Stud & Nut, Full Thread
Stud Size: 3/8 Inch - 4 Inch
Standard: API 20E BSL-1, ASME B18.2.1
Material: ASTM A193 Grade B7/ASTM A194 Grade 2H
Length: Customized
Surface: Plain, Zinc Plated (Yellow, White)

Source: https://www.landeepipefitting.com/zinc-plated-stud-nut-api-20e-bsl-1-astm-a193-b7-a194-2h.html