CARBON STEEL FORGED FITTINGS AND PIPE NIPPLES Shapes Elbows, Equal and Reducing Tees, Reducers, Caps, Couplings, Half-Coupling, Bosses, Unions, Crosses End connections: threaded (NPT, etc.) / socket welding Standards/Grades ASTM A 105 N / ASTM A 106 /API 5.1 Gr.B (Pipe Nipples) ASME B16.11 Dimensions / Tolerances / Testing (according to Standard) Outside Diameter: 1/8" to 4" Class 3000, 6000 Finishing On request: Special markings, colour coding, etc. Certification 3.1 B according to EN 10 204 Applications For use with "oil series" pipe, diameter < or = 4"