labwork U-Bolts for Chevy Silverado/GMC Sierra 1500 — 4pcs Square Galvanized for 2.5" Leaf Springs, 9/16" x 8.75"

These labwork 4-piece square U-bolts are replacement fasteners engineered to secure 2.5-inch wide leaf springs on Chevy Silverado and GMC Sierra 1500 trucks from 1988 through 2019.

When you need reliable hardware to clamp leaf springs to the axle, this labwork kit provides four galvanized square U-bolts sized for common 2.5-inch spring packs. The set is built from OEM-quality materials for long-term use and comes in silver or gold plating sent at random. Before ordering, verify your leaf spring width and the required U-bolt length so the parts match your truck’s setup.

Will these U-bolts fit my Silverado or Sierra model year?

These U-bolts are specified to replace factory hardware on Chevy Silverado 1500 and GMC Sierra 1500 models spanning 1988–2019, designed for 2.5-inch-wide leaf springs. Fitment depends on spring width and the distance from the bottom of the elbow to the thread tip (threaded length).

• Intended for 2.5-inch-wide leaf springs—measure spring pack width first.
• 8.75 inches is the measured length from elbow base to thread end.
• 9/16-inch diameter provides common OEM strength and thread engagement.
• Compatible across front and rear placements when dimensions match.

How durable are these labwork U-bolts under heavy use?

The kit uses galvanized, OEM-quality metal to resist corrosion and withstand long working hours without frequent replacement. Galvanization and proper installation extend service life in road and weather exposure, though routine inspection is recommended for heavy-duty applications.

• Galvanized finish helps prevent rust and surface deterioration.
• 9/16" diameter for solid clamping strength under load.
• OEM-equivalent material selection for extended service life.
• Sold as a 4-piece set—replace all mounting U-bolts for consistent torque and wear.

What size and specifications should I check before buying?

Confirm three measurements to ensure correct fit: the leaf spring pack width, the U-bolt length (8.75" from elbow to thread in this kit), and thread diameter (9/16"). Also check clearance around the axle and whether you need short or long U-bolts for lifted or stock ride heights.

• Measure leaf spring width: must be 2.5 inches for this kit.
• Verify U-bolt length: 8.75" from elbow bottom to threaded end.
• Thread diameter: 9/16" to match nuts and mounting plate.
• If truck is lifted, compare with stock U-bolt length to ensure adequate thread engagement.

How should these U-bolts be installed and maintained?

Install with matching nuts and torque to your vehicle manufacturer’s specifications for leaf-spring to axle clamps. Inspect torque and corrosion periodically, and replace U-bolts in matched sets when threads are damaged or when signs of fatigue appear.

• Use proper torque sequence and torque wrench—follow vehicle specs.
• Replace U-bolts in sets to maintain even clamping and safety.
• Check and re-torque after initial miles and during regular maintenance.
• Visually inspect for rust, thread damage, or deformation during service intervals.

Who is this for: The labwork 4Pcs square U-bolt kit is aimed at Silverado and Sierra owners doing leaf-spring maintenance, suspension repairs, or rebuilds who require OEM-style hardware for 2.5-inch spring packs. It fits DIY mechanics, professional technicians, and fleet managers who need a cost-effective, galvanized U-bolt set with standard 9/16" diameter and 8.75" length—provided the truck’s spring width and desired bolt length match the kit specifications.