ASTM A194 Grade 7 Heavy Hex Nut

The ASTM A194 Grade 7 Heavy Hex Nut is a critical high-strength fastener specifically designed for use in high-temperature and high-pressure environments. These alloy steel nuts are typically paired with ASTM A193 Grade B7 alloy steel bolts or studs in flanged joints for pipes, pressure vessels, valves, and specialized pipe fittings. The Grade 7 designation ensures the nut has superior strength and temperature resistance, making it indispensable in the petroleum, chemical, power generation, and construction industries where joint integrity is paramount. Zeron Fasteners manufactures and supplies these specialized nuts, guaranteeing they meet all strict material, heat treatment, and dimensional specifications required for critical service applications.

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ASTM A194 Grade 7 Heavy Hex Nut Manufacturer in India

ASTM A194 Gr. 7 Heavy Hex Nut Chemical Composition

Element Composition (%)
Carbon (C) 0.38 to 0.48
Manganese (Mn) 0.75 to 1.00
Phosphorus (P) 0.035 maximum
Sulfur (S) 0.040 maximum
Silicon (Si) 0.15 to 0.35
Chromium (Cr) 0.80 to 1.10
Molybdenum (Mo) 0.15 to 0.25

ASTM A194 Gr. 7 Heavy Hex Nut Mechanical Properties

Property Specification
Material Alloy Steel (AISI 4140 to 4142)
Heat Treatment Quenched and Tempered
Hardness (Brinell) 248-352 HB
Proof Load Stress 150000 psi (1035 MPa)
Thread Series UNC, 8 UN, or Metric

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