Black Coating Hex Head Nuts 42CrMo Double Ended Threaded Bolt

Stud bolt ASTM A193 B8/B8M "Thread to Thread" Class 2A c/w 2 Heavy Hex Nut ASTM A194 Gr.8/8M Class 2B

Stud bolt, nuts, machine bolts, and washers are also known as bolting material or fastener. Bolting is the term that used to tighten/create the flange joints connection. The tightening of the flange ensures the leak-proof connection between gasket & flanges.

ASME flanges have a minimum four bolt hole and for higher diameter flanges, the number of bolt holes is always in multiples of four. Selection of number bolt holes depends on the factor such as

Size of the flange
Working pressure
Working temperature
Flange material

ASTM A193 B7 Alloy steel, AISI 4140 or 4142, quenched and tempered

ASTM A193 B6 Stainless steel, AISI 410, heat treated

ASTM A193 B8 Class 1 Stainless steel, AISI 304, carbide solution treated.

ASTM A193 B8M Class 1 Stainless steel, AISI 316, carbide solution treated.

ASTM A193 B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened

ASTM A193 B8M Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

ASTM A193 B8T Class 1 or 2 Stainless steel, AISI 321, with additional element of Titanium

ASTM A193 B16 Chromium-Molybdenum-Vanadium, similar to B7 with Vandium added

ASTM A193 B7M Similar properties as B7 but with specialized heat treating to create differing mechanical properties

ASTM A193 B8R Stainless steel, AISI 209, also known as Nitronic 50, nitrogen strengthened

ASTM A193 B8S Stainless Steel, AISI 218, also known as Nitronic 60, nirtrogen strengthened