Rexka 5/16-18 Hex Sems Bolt & U-Nut Kit — 10 Sets, Yellow Zinc Corrosion-Resistant Fasteners

Rexka's 10-set 5/16-18 bolts and U-nuts kit supplies the matching hex sems bolts and yellow-zinc U-nuts needed to replace or secure body panels, trim, and components on GM, Ford, Chrysler vehicles and many DIY projects.

This compact hardware pack contains 10 hex-head sems body bolts with dog points and matching 10 yellow zinc U-nuts sized 5/16-18. Sized for common automotive body and trim fastenings, the bolts are zinc plated with yellow dichromate for improved corrosion resistance and fast installation. The set fits a wide range of applications including fenders, pickup boxes, radiators, air intakes, exhaust shields, seat mounts, interior and exterior trim, and general engine-bay attachments.

What exactly is included and how are the parts specified?

The kit includes ten hex-head sems body bolts and ten U-nuts engineered to work together for threaded panel attachments. Each bolt measures 5/16-18 x 1-1/16" with a 1/2" hex head and 7/8" washer outer diameter; U-nuts are stamped yellow zinc to grip panel edges.

• 10x hex head sems body bolts, 5/16-18 x 1-1/16" length
• 7/8" washer integrated on each bolt for load distribution
• 10x yellow zinc 5/16-18 U-nuts for edge clamping
• Zinc plating with yellow dichromate finish for corrosion resistance

How will these bolts and U-nuts perform on my vehicle?

Designed for common body and trim uses, these fasteners provide secure clamping and straightforward replacement for worn or missing hardware. The dog point on the sems bolts helps align and start threads easily while the integrated washer on the head spreads load across panel surfaces.

• Dog point helps self-centering during installation
• Integrated washer reduces panel bite and damage
• U-nuts fasten to panel edges without needing a tapped hole
• Yellow zinc finish slows rust and increases longevity

Where are these best used on GM, Ford, Chrysler and other vehicles?

These fasteners are suitable wherever 5/16-18 body bolts are specified—common on fenders, pickup boxes, radiator shrouds, air intake brackets, exhaust shields, seat rails, interior trim pieces and many engine-bay mounts. The set is particularly handy for repair, restoration, or aftermarket accessory installs where original hardware is corroded or missing.

• Exterior panels: fender liners, trim, bumpers
• Under-hood: radiator mounts, intake supports, shields
• Cabin and seats: interior trim, seat brackets
• Aftermarket add-ons: mounting brackets and brackets for accessories

How do I install them and what tools are needed?

Installation is straightforward: clip the U-nut onto the panel edge so the threaded boss aligns with the hole, then insert the sems bolt through the mating part and tighten with a 1/2" (12.7 mm) wrench or socket. The dog point aligns the threads and reduces cross-threading risk; do not over-torque to avoid U-nut deformation.

• Tools: 1/2" socket or wrench and a ratchet
• Clip U-nut onto panel edge before inserting bolt
• Tighten until snug—avoid excessive torque
• Use thread-locker if a vibration-critical application requires it

Who is this for? This Rexka kit is aimed at DIY mechanics, restoration enthusiasts, body shops and fleet maintenance teams who need a small, ready-to-use supply of matched body bolts and edge-clamp U-nuts. It’s ideal for quick repairs, replacing corroded hardware, or stocking a service drawer for common 5/16-18 fastener needs on GM, Ford, Chrysler, Dodge and other vehicles. The compact set saves time sourcing individual pieces and ensures compatibility between bolt and U-nut for reliable panel fastening.