ASTM A194 Grade 7 Heavy Hex Nuts

The **ASTM A194 Grade 7 Nuts** are a key component of **high-pressure and high-temperature bolting assemblies**, typically paired with **ASTM A193 Grade B7 Stud Bolts**. These **heavy hex nuts** are manufactured from heat-treated **chromium-molybdenum alloy steel**, giving them exceptional strength and resistance to creep. The specification ensures that the nuts have the necessary structural integrity to safely hold connections in critical applications such as **petroleum and natural gas facilities, power generation plants, and pressure vessel construction**. **Zeron Fasteners** is a certified manufacturer and supplier, providing reliable A194 Grade 7 Nuts that meet strict industry standards.

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ASTM A194 Grade 7 Heavy Hex Nuts Manufacturer in India

ASTM A194 Grade 7 Heavy Hex Nuts Chemical Composition

Element Composition (% Maximum/Range)
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 Grade 7 Heavy Hex Nuts Mechanical Properties

Property Requirement
Proof Load Stress, min 150000 psi (1034 MPa)
Hardness (Brinell) 248 to 352 HBW
Hardness (Rockwell) 23 to 38 HRC
Minimum Tensile Stress 170000 psi (1172 MPa)
Product Markings 7

Features Product

Hastelloy C22 Reducing Elbows Duplex S32750 Reducers SS 316L Couplings Carbon Steel Stud Bolts

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