1/4"-28 L9 Hex Head Cap Screw – Alloy Steel Zinc Yellow CR+3 (Fine Thread, Made in U.S.A.)

1/4"-28 L-9 Hex Head Cap Screw – Alloy Steel Zinc Yellow CR+3 (Fine Thread, Made in U.S.A.)

Part Numbers: 440044, 440048, 440052, 440054, 440056, 440058, 440060, 440064, 440068

Introducing our premium 1/4"-28 L-9 (L9) Hex Head Cap Screws, the ultimate solution for high-stress applications requiring fine threading and maximum strength. Engineered for unmatched performance, these screws are made in the USA from high-grade alloy steel and boast an impressive tensile strength of 180,000 psi—the highest in the industry.

Why Choose Our L-9 (L9) Hex Head Cap Screws?

L-9 (L9) fasteners represent the pinnacle of SAE grading for hex cap screws, designed to withstand extreme loads and stress conditions. Identified by nine radial lines on the head, these screws ensure easy recognition of their superior grade. The fine thread (UNF) design offers greater tensile strength and better adjustment accuracy, making them ideal for critical applications. The Zinc Yellow CR+3 plating provides enhanced corrosion resistance and a professional finish.

Key Benefits:

• Ultra High Tensile Strength: With a tensile strength of 180,000 psi, these screws handle the most demanding tasks.
• Fine Thread Design: 1/4"-28 UNF threading for precise adjustments and superior tensile strength.
• High-Grade Alloy Steel: Manufactured from premium alloy steel for exceptional durability.
• Nine Radial Lines: Head markings with nine lines indicate the highest SAE grade L-9 (L9) for easy identification.
• Zinc Yellow CR+3 Plating: Offers superior corrosion resistance and aids in torquing.
• Made in the USA: Ensures top-quality manufacturing and compliance with industry standards.
• Enhanced Design Features:
  • Thicker heads for better wrench contact and reduced slippage.
  • Radius under the head adds strength and reduces stress concentrations.
  • Smooth washer-bearing surfaces for uniform load distribution.
• Versatile Applications: Ideal for automotive, aerospace, heavy machinery, and precision equipment.
• Bulk Availability: Cost-effective solutions for businesses requiring large quantities.

Ideal Applications:

Our L-9 (L9) Hex Head Cap Screws with fine threads are perfect for applications where precise adjustments and maximum strength are critical. They are ideal for high-vibration environments, precision machinery, automotive engines, aerospace components, and other demanding industrial applications.

Technical Specifications:

• Size: 1/4"-28 (Diameter: 0.250", Threads per Inch: 28)
• Length Options: Available in various lengths to suit your specific needs (please select from the options above)
• Material: High-Grade Alloy Steel (Grade L-9 / L9)
• Finish: Zinc Yellow CR+3 Plating for enhanced corrosion resistance
• Tensile Strength: Minimum 180,000 psi
• Head Style: Hex Head with nine radial lines for SAE Grade L-9 (L9) identification
• Thread Type: Fine Thread (UNF)
• Standards: Meets or exceeds SAE J429 Grade L-9 specifications
• Manufactured In: United States of America

Full L-9 Product line

Place Your Order Today!

Equip your projects with the unparalleled strength and precision of our 1/4"-28 L-9 (L9) Hex Head Cap Screws. Don't compromise on quality for your critical applications. Order now to take advantage of our competitive pricing and ensure your assemblies are secured with the best fasteners available.