EZ Loader 1/2"-13 x 4-1/2" Hex Head Bolt (Grade 5, Zinc) | 290-001555

EZ Loader 1/2"-13 x 4-1/2" Hex Head Bolt (Grade 5, Zinc) | 290-001555

This OEM EZ Loader hex head bolt is designed for trailer applications where longer reach and proper clamping force are required. Commonly used in frame connections, bunk supports, and bracket mounting, this bolt matches OEM specifications for reliable fitment and performance.

Designed for Trailer Applications

This bolt is used in areas where components require additional length for proper engagement and secure fastening.

• Bunk support mounting points
• Frame and crossmember connections
• Bracket and accessory mounting

👉 Designed to maintain clamping force under vibration and load.

Grade 5 Strength

• Medium carbon steel construction
• Higher strength than standard hardware bolts
• Designed for structural and mounting applications

👉 Provides the strength needed without excessive brittleness.

Hex Head Design

• Standard hex head for easy installation
• Allows proper torque application
• Compatible with common tools

Zinc-Plated Finish

• Sacrificial corrosion protection
• Helps protect base metal and surrounding components
• Consistent with OEM trailer hardware systems

👉 Zinc is designed to wear first, protecting the trailer over time.

Fitment & Specifications

• Size: 1/2"-13 UNC x 4-1/2" Length
• Thread Type: Coarse Thread (UNC)
• Grade: Grade 5
• Head Type: Hex Head (HH)
• Finish: Zinc Plated

Common Applications

• Bunk support assemblies
• Frame and bracket mounting
• General trailer hardware replacement

Important Installation Note

👉 Always match bolt length, diameter, and grade to the application. Do not substitute lower-grade hardware.

Designed to provide proper thread engagement where longer bolt length is required.

Why This Part Matters

• Maintains proper clamping force
• Supports structural integrity
• Reduces loosening under vibration

👉 Hardware is part of the trailer system—not interchangeable by appearance alone.

Real-World Insight

At 411-Trailers Group, correct bolt length is just as important as diameter and grade. Using the proper length ensures full thread engagement and prevents loose or misaligned components.