Bolt and nut ASME B1.1 Standard

　　Studbolts and nuts 1" diameter and smaller shall have unified coarse thread series (UNC) with a Class 2A fit for external threads and a Class 2B thread for internal threads.

　　Studbolts and nuts 1 1/8" diameter and larger shall have unified 8 thread Series (8UN) with a Class 2A fit for external threads  and a Class 2B thread for internal threads.

　　Please note that bolts shall have a full continuous thread and threads shall comply with ASME B1.1 .

　　SRT is a Group Company. Full name is Hebei Shengtian Group Reaguan Pipeline Co., Ltd, which mainly produce and export seamless steel pipes, spiral  steel pipes, welded steel pipes and oil pipes .

　　We are engaged in manufacturing of a wide range of Butt Weld Fitting that is available in varied types such as L/R & S/R elbow, tee, concentric and eccentric reducers, seamless steel pipe ,welded steel pipe,oil pipe,spiral steel pipe. Sourced from reliable vendors, these fittings are highly acknowledged for their high tensile strength, durability and accurate alloy composition. These find application in several industries such oil & gas, automobile, acid & chemical, pharmaceutical and cement industries. We are known for our butt welding fitting pieces.