ASTM A194 2H heavy hex nut 

Bolt, Full thread stud, Stud, Stud Bolt, Threaded Rod      A194-2H nut is a high-strength nut commonly used to connect high-strength bolts and screws. Its standard is ASTM A194, where H represents that the nut has undergone hardening treatment, ranging in size from 1/4 inch to 4 inch. The material is usually high-strength alloy steel, which is heat treated and cooled to improve its strength and hardness. When using it, it must be installed and disassembled correctly, To ensure its performance     High temperature and high pressure resistant nuts, usually suitable for high and medium pressure valves, marine, marine, chemical, and fluid engineering; Pressure vessels, petrochemical equipment, and other high-temperature and high-pressure equipment    ASTM A194 Gr.2H is an American standard nut grade, while ASTM A194 is a standard for carbon and alloy steel nuts used in high-temperature and high-pres…