ASTM A194 Grade 4 Heavy Hex Nuts for B16/L7 Studs

These ASTM A194 Grade 4 heavy hex nuts are engineered to match the high-strength requirements of B16 and L7 stud bolts. They are specifically designed for high-pressure and high-temperature industrial applications where standard nuts may fail under extreme stress. The nuts feature a heavy hex design that provides a larger bearing surface and improved torque retention, ensuring reliable joint integrity in critical flanged connections.

While ASTM A194 Grade 4 was removed from the current ASTM standard in 2017 with Grade 7 becoming the primary substitute, these nuts remain fully compliant with SAES-L-109 specifications. This makes them a preferred choice for projects in the Saudi region that specify legacy or existing infrastructure requirements. Each nut is heat-treated to achieve a hardness range of 24–38 HRC, ensuring consistent performance and resistance to deformation under load.

• Material: Alloy steel heat-treated to ASTM A194 Grade 4 specifications.
• Hardness: 24–38 HRC for optimal strength-to-toughness balance.
• Proof Load: Minimum 175 ksi, suitable for high-stress bolted joints.
• Compatibility: Ideal pairing for ASTM A193 B16 and L7 stud bolts.
• Standard Compliance: Meets SAES-L-109 requirements for Saudi industrial projects.
• Design: Heavy hex shape enhances clamping force and reduces galling risk.