EZ Loader 3/8"-16 x 1-1/4" Hex Head Bolt (Grade 5, Zinc) | 290-011847

EZ Loader 3/8"-16 x 1-1/4" Hex Head Bolt (Grade 5, Zinc) | 290-011847

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

Designed for Trailer Applications

Trailer hardware is exposed to vibration, load cycling, and environmental conditions. This bolt is used in areas where secure fastening and structural integrity are critical.

• Vibration during towing
• Load transfer across components
• Outdoor and marine exposure

👉 Designed to maintain clamping force under real-world conditions.

Grade 5 Strength

• Medium carbon steel construction
• Higher strength than standard hardware bolts
• Designed for structural trailer connections

👉 Grade 5 hardware provides the strength needed without over-hardening or brittleness.

Hex Head Design

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

Zinc-Plated Finish

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

👉 Zinc is designed to wear first, helping protect the trailer structure over time.

Fitment & Specifications

• Size: 3/8"-16 UNC x 1-1/4"
• Thread Type: Coarse Thread (UNC)
• Grade: Grade 5
• Head Type: Hex Head (HH)
• Finish: Zinc Plated

Common Applications

• Bracket mounting
• Frame connections
• Light structural assemblies
• General trailer hardware replacement

Important Installation Note

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

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, we regularly see failures caused by incorrect bolt grade or improper substitutions. Using the correct Grade 5 hardware helps maintain trailer strength and long-term reliability.