ASTM A194 Grade 8M Stainless Steel Heavy Hex Nuts

The ASTM A194 Grade 8M Heavy Hex Nut is the required companion fastener for the ASTM A193 Grade B8M stud bolt, ensuring a mechanically compatible and secure joint in critical applications. Made from austenitic stainless steel (equivalent to AISI Type 316), these nuts contain Molybdenum, offering excellent resistance to corrosion, especially in chloride and acidic environments found in marine, offshore, and chemical processing facilities. The "Heavy Hex" style provides a larger bearing surface, which is essential for uniform load distribution in high-pressure flange joints. Zeron Fasteners manufactures these nuts to precise dimensional and mechanical specifications, guaranteeing reliable and certified performance when combined with their corresponding stud bolts.

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ASTM A193 B8M Stud Bolts SS 316 Hex Bolts SS 316 Washers SS 316 Threaded Rods SS 316 Weld Neck Flanges SS 316 Blind Flanges
ASTM A194 Grade 8M Stainless Steel Heavy Hex Nuts Manufacturer in India

ASTM A194 Grade 8M Heavy Hex Nuts Chemical Composition

Element Composition (Mass %)
Carbon (C) 0.08 max
Manganese (Mn) 2.00 max
Phosphorus (P) 0.045 max
Sulfur (S) 0.030 max
Silicon (Si) 1.00 max
Chromium (Cr) 16.0 – 18.0
Nickel (Ni) 10.0 – 14.0
Molybdenum (Mo) 2.00 – 3.00

ASTM A194 Grade 8M Heavy Hex Nuts Mechanical Properties

Size Range Proof Load Stress Hardness (max)
Up to 1 inch 150 ksi (1035 MPa) 223 HBW
1-1/8 to 1-1/4 inch 140 ksi (965 MPa) 223 HBW
1-3/8 inch and over 135 ksi (930 MPa) 223 HBW

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