7/16"-14 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)

7/16"-14 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)

Part Numbers: 440254, 440258, 440260, 440262, 440264, 440266, 440270, 440274, 440278, 440282, 440286, 440290

Our 7/16"-14 L9 Hex Head Cap Screws are engineered for the highest durability and performance in the most demanding applications. Made in the USA from premium alloy steel, these fasteners boast an impressive tensile strength of 180,000 PSI, ideal for heavy-duty use in construction, automotive, and industrial environments.

Why Choose L9 Hex Head Cap Screws?

L9 fasteners are the strongest hex cap screws available, meeting SAE’s highest grade specifications. Recognized by their nine radial lines and “L9” marking, these screws are designed to endure extreme stress and vibration. The coarse thread (UNC) design provides a solid grip, ideal for high-torque applications, while the Zinc Yellow CR+3 coating enhances corrosion resistance, extending the lifespan of your fasteners.

Enhanced Design Features:

• Increased Head Height: Slightly taller head per ASME B18.2.1 standards allows for better wrench engagement and reduced slippage.
• Radius Under Head: Reduces stress concentration to minimize fatigue-related failures.
• Smooth Washer-Bearing Surface: Provides even load distribution, reducing the risk of loosening under dynamic loads.

Key Mechanical Properties:

• Hardness: 38 to 42 HRC
• Surface Hardness: Maximum HR15N 81.5
• Tensile Strength: 180,000 PSI Minimum
• Yield Strength: 155,000 PSI Minimum
• Proof Load Strength: 145,000 PSI
• Elongation: 12% Minimum
• Reduction of Area: 35% Minimum
• Head Marking: Nine radial lines with "L9" marking for easy identification

Advanced Surface Finish:

• Zinc Yellow Plated: Meets ASTM F1941/F1941M Fe/Zn 5CN standards, providing a minimum thickness of 5 microns (0.0002").
• Yellow Trivalent (Cr+3) Coating: Provides superior corrosion resistance, with 96 hours of protection before red rust appears in salt spray testing.

Technical Specifications:

• Size: 7/16"-14 (Diameter: 0.4375", Threads per Inch: 14)
• Length Options: Various lengths available to fit specific requirements (select above)
• Material: High-Grade Alloy Steel (L9)
• Finish: Zinc Yellow CR+3 Plating for corrosion resistance
• Thread Type: Coarse Thread (UNC)
• Manufactured In: United States

Ideal Applications:

The 7/16"-14 L9 Hex Head Cap Screws are perfect for heavy-duty projects requiring maximum reliability and strength, such as machinery, automotive assemblies, and high-stress construction projects. Built to withstand the toughest conditions, these fasteners deliver exceptional performance.

Full L9 Product Line

Order Yours Today!

Secure your projects with the trusted strength of our 7/16"-14 L9 Hex Head Cap Screws. Order now to experience fast shipping and dedicated customer service from Monster Bolts.