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Class 3000 Threaded Union ASME B16.11

Class 3000 threaded union is the most used pressure of threaded union.ASME B16.11 is the standard for forged fittings according to American Standard.

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The threaded pipe union is similar to the coupling and can be flexibly disassembled when it needs to be repaired or replaced. The reducing threaded union is easy to disconnect and link, and can be operated multiple times.Threaded union is belong to forged fittings.ASME B16.11 is presents forged pipe fittings in American Standard.


Threaded Types:




Forged Threaded Fittings Union are designed for wide use in different industries like oil refineries, chemical processing, petrochemical and many other industries.


Threaded Union VS Threaded coupling 

The basic difference between couplings and unions in use is that couplings connect pipes to pipes or pipes to bends.Unions are used to connect and disassemble part of the piping system for maintenance or replacement.



Shape Union
Size Range 1/8″ –  4″ / DN6 – DN100
Pressure Rating Class 2000lbs, 3000lbs, 6000lbs
Thread Type NPT, PT, BSPP, BSPT, PF
Standard ASME B16.11, BS3799, EN 10241, MSS SP-83, MSS SP-97
Carbon Steel ASTM A105 / A105N, ASTM A350 LF2/LF3, ASTM A694 F42 / 46 / 56 / 60 / 65, P235GH, P265GH, P280GH, P355GH
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 / 22
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317, 347, 904L,1.4404, 1.4437.
Duplex Stainless Steel ASTM A182 F51, F53, F44



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