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Grade 8 Hex Flange Bolt & Lock Nut Kit – 352-Piece Assortment

$153.31 on Amazon.com (as of October 19, 2026, 10:28 AM EST) View details ↗

Built for heavy-duty applications, this **Grade 8 Hex Flange Bolt & Lock Nut Kit** delivers superior strength and durability for industrial, automotive, and mechanical projects. Each bolt features a **black phosphate and oil finish** for corrosion resistance, while the **matching hex flange top lock nuts** ensure a secure, vibration-resistant hold. The **heavy-duty steel 24-hole compartment tray** keeps your fasteners organized and easily accessible, with dimensions of **13-3/8″ x 9-1/4″ x 2″** for compact storage.

This kit includes **1/4″, 5/16″, 3/8″, and 1/2″ coarse thread diameters**, making it versatile for a wide range of applications. Whether you're working on machinery, construction, or automotive repairs, these **Grade 8 fasteners** provide the reliability you need. The **locking flange nuts** prevent loosening, reducing maintenance time and improving safety. Order now to stock up on a high-performance fastener solution.

MaterialGrade 8 Steel (Bolts & Nuts)
FinishBlack Phosphate & Oil
Thread Sizes1/4″, 5/16″, 3/8″, 1/2″ Coarse
Load RatingGrade 8 (High Strength, 150 ksi Proof Load)
Tray Dimensions13-3/8″ (W) x 9-1/4″ (D) x 2″ (H)
Tray Capacity24 Compartments
Are these bolts and nuts compatible with standard 1/4″ to 1/2″ threaded applications?
Yes, the included sizes (1/4″, 5/16″, 3/8″, and 1/2″) are standard coarse threads, making them compatible with most common applications.
How does the locking flange nut prevent loosening?
The hex flange top lock nuts feature a built-in locking mechanism that resists vibration and torque, reducing the risk of loosening.
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