ASTM A193 B7 Stud Bolt with Heavy Hex Nuts

Stud Bolt & Nuts 

ASTM A193 Grade B7 Stud Bolts are fully threaded fasteners designed for use with two nuts, most commonly in flanged connections across petroleum, chemical, and general industrial applications. 

For flange service, stud bolts feature continuous threading with chamfered ends to assist nut installation. Stud bolt length is measured from the first full thread on one end to the first full thread on the opposite end; the chamfered ends are not included in the measured length. This thread-to-thread measurement ensures proper nut engagement and consistent fit in flange assemblies. Stud bolts without chamfered ends are measured end-to-end. 

Standard Materials 

ASTM A193, Grade B7

 A heat treated chrome-Moly steel widely used for medium high temperature service ( -50 900 °F) 

ASTM A193, Grade B16

 A heat treated chrome-Moly steel for high pressure, high temperature service ( -50 to 1100 °F) ASTM A193, Grade B8 Stainless Steel 304, used in corrosive environments ( -325 to 1500 °F) 

ASTM A193, Grade B8M 

Stainless Steel 316, used in corrosive environments ( -325 to 1500 °F) 

ASTM A320, Grade L7M

Designed for use in low temperature corrosive environments, controlled hardness to 235 Brinell maximum. ( -150 to 1100 °F) 

Flange Bolt Packs – Stud Kits with your Gasket selection 

 Flange Stud / Bolt Kits are available from D&D/Spiraltec. Pair these with your selected gaskets. Standard kits are available for all ASME flange sizes ½” to 24” Our Flange Bolt / Stud Kits are provided with the B7 A193 Stud bolt, 2H A194 nuts, and washers (if requested) STUD packs are also available in, B7 PTFE Coated, Stainless Steel B8M and B7 A193 Zinc plated (150# flanges ½” to 12”) 

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B7 Bolt Coatings 

ASTM A-193 B7 bolts can also be coated in a wide range of materials, including: 

• Flouropolymer coatings -Blue Xylan and Blue Teflon 

• Molybdenum Disulfide 

• Epoxy Coatings – Thermal cure 

• Phosphate coating – Manganese and Zinc 

Coated grade B7 bolt studs may not be able to withstand the extreme temperatures as listed above.