The Leaf Spring Pin (OEM: 1-51161004-3 / 1511610043 / 1-51161-004-3) is a forged carbon steel pin used in the rear suspension shackle system of Isuzu FSR, Elf, and FSR90 medium-duty trucks. It passes through the spring eye and the bracket/shackle plate, acting as a pivot point that allows the spring to rotate while withstanding vertical and lateral loads.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable suspension performance
• High-Strength Steel: Forged or machined from carbon steel, heat-treated for wear resistance
• Precision Ground Shank: Smooth surface reduces bushing wear and ensures proper fit
• Grease Fitting Ready: Includes hole for grease zert to allow lubrication
• Corrosion Resistant: Zinc plating or black oxide coating protects against rust
• Threaded End: Allows secure fastening with a nut and cotter pin
• Restores Suspension Integrity: Eliminates play, clunking noises, and uneven tire wear
• Direct Replacement: Matches OE dimensions - no modification required
• Cost-Effective: Affordable alternative to genuine OEM pins

This leaf spring pin is designed specifically for Isuzu medium-duty trucks:

• ISUZU FSR (medium-duty truck, various model years)
• ISUZU Elf (light-duty truck, N-series)
• ISUZU FSR90 (specific chassis variant)

Engine Compatibility: Not engine-specific - fits various engines (6BD1, 6BG1, 4BD1, etc.)

Typical installation steps for spring shackle pin replacement:

1. Safely lift and support the vehicle, support the axle
2. Remove the old nut and cotter pin
3. Drive out the old spring pin (use penetrating oil if seized)
4. Inspect the spring eye bushings - replace if worn
5. Clean the bushing inner surface
6. Lubricate the new pin shank with grease
7. Insert the new pin through the chassis bracket, bushing, and shackle plate
8. Install new nut and torque to specification (typically 80-120 Nm for light/medium trucks)
9. Insert a new cotter pin
10. Grease the pin through the zert fitting until grease exits the bushing ends
11. Repeat for the other side (replace in pairs)

• Material Verification: Steel composition and tensile strength tested
• Dimensional Inspection: Length, diameter, thread pitch, and head dimensions verified against OE blueprints
• Hardness Testing: Surface hardness (HRC 35-45) confirmed
• Thread Gauge Inspection: Threads checked with GO/NO-GO gauges
• Grease Hole Inspection: Hole diameter and position verified
• Visual Inspection: 100% checked for burrs, cracks, or surface defects
• Packaged Safely: Pin wrapped in anti-rust paper, sealed in plastic bag

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea