ASTM A193 Grade B7 Continuous Threaded Rods

The ASTM A193 Grade B7 Continuous Threaded Rod is the fundamental high-strength fastener used in flanged pipeline joints across critical industries. Essentially a stud bolt without bolt points or chamfers, it is a continuous threaded rod manufactured from Alloy Steel (Chromium-Molybdenum steel), which is quenched and tempered to achieve high tensile and creep rupture strength. This makes it suitable for service temperatures up to 450°C (842°F). These threaded rods are cut to length and typically supplied with two ASTM A194 Grade 2H Heavy Hex Nuts to complete the bolted joint. The precise thread fit and high material strength are vital for achieving the high pre-load necessary to maintain a leak-proof seal in high-pressure piping systems. Zeron Fasteners manufactures B7 threaded rods (studs) to meet all required lengths, often with protective coatings like hot-dip galvanizing or PTFE.

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ASTM A194 Gr 2H Heavy Hex Nuts ASTM F436 Hardened Washers ASTM A193 B7 Heavy Hex Bolts ASTM A193 Grade B16 Stud Bolts
ASTM A193 Grade B7 Threaded Rods Manufacturer in India

ASTM A193 Grade B7 Threaded Rods Chemical Composition

Element Composition (Mass %)
Carbon (C) 0.37% to 0.49%
Manganese (Mn) 0.65% to 1.10%
Phosphorus (P) 0.035% maximum
Sulfur (S) 0.040% maximum
Silicon (Si) 0.15% to 0.35%
Chromium (Cr) 0.75% to 1.20%
Molybdenum (Mo) 0.15% to 0.25%

ASTM A193 Grade B7 Threaded Rods Mechanical Properties

Property Value
Size Range Up to 4 inches
Tensile Strength, minimum 125 ksi (860 MPa) minimum
Yield Strength, minimum 105 ksi (720 MPa) minimum
Elongation After Fracture, minimum 16% minimum
Reduction of Area, minimum 50% minimum
Hardness (Brinell) 248 to 321 HBW

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