Fanmao 3-1/2" Trailer Leaf Spring Shackle Straps 8-Pack — 9/16" Bolt Holes, Electro-Galvanized Steel

Fanmao 8-pack 3-1/2" heavy-duty trailer leaf spring shackle straps are precision-fit shackle links made from electro-galvanized low carbon steel for reliable trailer suspension connections.

These shackle straps are engineered to join double-eye leaf springs to rear hangers on single-axle trailers or to equalizers on multi-axle setups. Sold as an 8-piece set, each strap offers consistent dimensions and hole sizing to replace worn shackles or to complete new trailer builds. The electro-galvanized finish resists corrosion while the low-carbon steel construction balances strength with ease of installation.

What are the exact dimensions and hole specifications?

Each shackle strap is sized to align with common trailer spring measurements for a secure fit. The center-to-center hole spacing, bolt diameter, overall length, width, and material thickness are standardized for interchangeability.

• Center hole to center hole: 3-1/2"
• Bolt hole diameter: 9/16" (precision fit)
• Overall length: 4-7/8"
• Width: 1-1/4"; Thickness: 3/16"
• Material: low carbon steel with electro-galvanized coating

How do these shackle straps perform in terms of durability and rust resistance?

The electro-galvanized coating provides a protective zinc layer that helps delay corrosion in typical road and storage conditions. Coupled with low-carbon steel construction, the straps deliver dependable service life when used within rated trailer loads and maintained properly.

• Electro-galvanized finish improves resistance to moisture and salt
• Low carbon steel offers predictable strength and ductility
• Consistent thickness reduces stress concentration points

Are these shackle straps easy to install and compatible with common trailers?

Yes—these straps are designed for straightforward replacement of worn shackles or for assembling new trailer suspensions. The 9/16" bolt hole and 3-1/2" center spacing match many OEM and aftermarket trailer spring setups.

• Precision 9/16" bolt hole fits standard shackle bolts
• 3-1/2" center spacing aligns with common spring eye sizes
• Sold in an 8-pack to service multiple axles or spare parts

What should I check before buying to ensure proper fit and safety?

Confirm the leaf spring eye spacing and bolt diameter on your trailer before installation. Inspect existing hangers, bolts, and surrounding hardware for wear—replacing multiple components at once is recommended for balanced suspension performance.

• Measure your current center-to-center spring eye spacing
• Verify bolt diameter and thread compatibility with existing hardware
• Replace worn bolts, nuts, and bushings to maintain safe operation

Who this is for: These Fanmao shackle straps are suited for trailer owners, repair shops, and DIY mechanics who need consistent, cost-effective replacement hardware. The 8-pack format is practical for multi-axle trailers, fleet maintenance, or stocking spare parts. They’re intended for mechanical suspension use—select appropriate rated components and follow vehicle and trailer manufacturer guidance for load capacity and installation procedures.