Rexka 5/16-18 SEMS Bolts & U-Nuts Kit, 10 Sets (Black Phosphate) — 5/16 x 7/8 Captive Washer

Rexka 10 Sets 5/16 Bolts & U Nuts is a compact fastener kit with ten indented hex head SEMS bolts and ten matching U-nuts designed to replace or reinforce body, trim, and accessory mounting points on GM, Ford, Chrysler, Dodge vehicles.

This kit brings together commonly used 5/16-18 hardware so you can repair loose panels, reinstall fender liners, secure radiator shrouds, or refit interior and exterior trim without hunting for individual parts. All pieces are finished in black phosphate for basic corrosion resistance and a low-profile, factory-appearing look. The fasteners are sized for broad compatibility across trucks, cars, and SUVs and are convenient for DIY maintenance, collision touch-ups, and garage restoration projects.

What exactly is included in this Rexka fastener set?

The kit contains 10 indented hex head SEMS body bolts and 10 matching 5/16-18 U-nuts. Bolts measure 5/16-18 x 7/8" with a 3/4" washer outer diameter and a 1/2" hex drive, sized to fit common sheet-metal applications.

• 10 indented hex head SEMS bolts, black phosphate finish
• Bolt dimensions: 5/16-18 x 7/8"; washer O.D. 3/4"; hex 1/2"
• 10 5/16-18 U-nuts, black phosphate finish
• Engineered for body panels, radiator shrouds, fender liners, and trim

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

These fasteners are intended for light- to medium-duty sheet-metal joins typical on automotive bodywork. The SEMS bolt keeps a captive washer for faster installation while the U-nut clips provide secure thread engagement in thin panels. The black phosphate finish offers surface protection and blends with factory hardware.

• Captive washer reduces lost parts and speeds assembly
• U-nuts clip onto panel edges for reliable thread alignment
• Suitable for non-structural body, trim, and accessory mounts
• Black phosphate finish resists surface rust and looks like OEM hardware

Which areas of a GM, Ford, or Chrysler vehicle typically use these fasteners?

These parts match mounting points found on fenders, bumpers, radiator support, air intake ducts, and interior trim panels. They're also useful for securing seat bracket covers, splash shields, and various exterior and engine-bay plastic components. Their dimensions align with many factory clip-and-bolt combinations used across older and newer model years.

• Fender and wheel well liners, splash shields
• Radiator shrouds and air intake ducts
• Exterior trim, bumper brackets, and body panels
• Interior trim panels and light accessory mounts

How should I install these bolts and U-nuts safely and efficiently?

Prep the mating surfaces by cleaning away rust, dirt, or old sealant. Push the U-nut onto the panel edge or hole so the stud aligns, then thread the SEMS bolt through the component and into the U-nut until snug; avoid over-torquing thin metal. Use a 1/2" socket or driver for the hex head and apply thread locking compound only where recommended.

• Clean mating surfaces before installation
• Clip U-nut to panel edge, align stud, hand-start bolt threads
• Use a 1/2" socket; tighten until secure but not over-torqued
• Apply thread locker only if manufacturer guidance requires it

Who is this for: This Rexka fastener kit is made for mechanics, body shops, and DIYers who need a small, ready supply of common 5/16-18 bolts and U-nuts for maintenance, collision repair, and trim reattachment on GM, Ford, Chrysler, Dodge vehicles. It’s ideal when you want a compact, OEM-style replacement set that saves time sourcing individual fasteners and supports quick fixes across interior, exterior, and engine-bay applications.