Finding reliable leaf spring bolts, shackle bolts, and related hardware is essential for maintaining a smooth, safe ride on trucks and trailers. This guide highlights five top-rated leaf spring bolt kits that cover a range of popular vehicles and trailer applications. Each option combines durable material, proper thread specifications, and complete hardware sets to help you secure your suspension with confidence.
| Product | Brand | Key Benefit |
|---|---|---|
| Leaf Spring Bolt Kit 9/16″ x 4-1/2″ | Opuiue | Grade 8 hardened steel, complete hardware |
| 4 Pack 9/16″-18 x 3″ Bolts | johntruck | High-strength Grade 5, rust resistant |
| 9/16″ – 3-1/2″ Shackle Bolts | Ussuray | Wide trailer compatibility, 18 TPI threads |
| Leaf Spring Eye Bolt Kit 9/16″ x 4-1/2″ | Cxewreu | Full hardware set, rust-protected finish |
| 9/16″-18 x 3″ Shackle Bolts | Lonffery | Grade 5 alloy steel, tight 18 TPI threads |
Leaf Spring Bolt Kit 9/16″ x 4-1/2″ — Opuiue
This kit is designed as an OE replacement for numerous Chevrolet and GMC models from 1988 to 2002, including C/K 1500/2500/3500 and related trims. The set comprises Grade 8 hardened steel bolts, lock nuts, and flat washers to deliver robust suspension performance and long-lasting durability. With broad compatibility, it serves as a direct substitute for original leaf spring bolts, helping to maintain proper alignment and ride quality. The manufacturer recommends verifying vehicle make, model, year, and trim prior to purchase to ensure a precise fit.
4 Pack 9/16″-18 x 3″ Bolts for Trailer Leaf Springs
These 9/16″-18 x 3″ bolts are designed for trailer leaf springs on 2,000 lb and 3,500 lb axles, suitable for mounting to hangers and the center equalizer bar. The set includes four bolts and four lock nuts, offering strong heat-treated Grade 5 steel construction with corrosion resistance. Their deep, well-defined threads help ensure good tightening strength and reliable retention under road conditions, making them a practical choice for common trailer suspensions.
9/16″ – 3-1/2″ Shackle Bolts 4-Pack
These shackle bolts are sized for most trailers with 6000 lb to 7000 lb axles, and they’re commonly used to mount 2″ wide slipper or double-eye leaf springs. The package includes four bolts and four nuts with a 9/16″ shank and 18 TPI thread, designed to provide reliable engagement and resistance to loosening on rough roads. The manufacturer emphasizes compatibility verification for your specific trailer model before purchase.
Leaf Spring Eye Bolt Kit 9/16″ x 4-1/2″ — 6 Bolts
Featuring Grade 8 hardened steel, this kit provides a complete hardware set—six bolts, six lock nuts, and twelve 9/16″ washers. It is designed for Chevy, GMC, Ford, and Dodge applications with a 9/16″ x 4-1/2″ footprint, offering rust-protected performance and reliable suspension support. The kit is marketed as a direct, full hardware replacement that helps restore alignment and ride stability on full-size pickups and similar vehicles.
Lonffery 9/16″-18 x 3″ Shackle Bolts 4 Pack
These Lonffery bolts are sized 9/16″-18 x 3″ and designed for 1-3/4″ double-eye springs used on common trailer suspensions. Made from Grade 5 alloy steel, they emphasize strength and durability under continuous loading. Each pack includes four bolts with matching lock nuts and emphasizes a precise 18 TPI thread for secure engagement, helping to reduce loosening during long hauls.
Buying Guide
- Compatibility: Verify vehicle or trailer axle type, spring width (e.g., 1-3/4″ or 2″), and whether you have single or double-eye springs to ensure the correct bolt length and shackle design.
- Material and Finish: Grade 5 vs Grade 8 hardware offers different strength levels. Grade 8 is higher strength and typically preferred for heavy-duty or off-road use. A rust-protective finish (e.g., black oxide or zinc coating) extends life in harsh conditions.
- Thread Specifications: Check threads per inch (TPI) like 18 TPI for reliable engagement. Deep, clear threads help prevent loosening with road vibration.
- Hardware Included: See whether the kit includes bolts, lock nuts, and washers. A full hardware set avoids separate purchases and ensures proper installation.
- Installation Fit: Look for direct OE replacements or kits advertised for your make/model (or compatible parts lists). Always confirm fitment details with product pages or support if you are unsure.
- Load and Axle Rating: Trailer kits should match your axle capacity (e.g., 2,000 lb and 3,500 lb axles). Using the wrong hardware can compromise suspension integrity and safety.
- Ease of Maintenance: Choose rust-resistant finishes and easily replaceable parts to simplify future maintenance and inspections.
- Warranty and Support: Prefer brands offering clear warranty and accessible support to address fit questions or part compatibility.