Rexka 5/16-18 Sems Bolts & U-Nuts Kit — 10 Sets Black Phosphate, Captive Washer for Trim

Rexka 10 Sets 5/16 Bolts & U Nuts is a ready-to-install hardware kit containing ten 5/16-18 sems body bolts and ten 5/16-18 U-nuts in black phosphate designed for trim, fender, radiator, intake and general automotive fastening.

This compact kit brings together commonly used 5/16" body bolts and matching U-nuts so you can replace stripped fasteners or finish a restoration without searching for individual pieces. The black phosphate finish resists corrosion and reduces galling while the sems-design bolts include captive washers to speed installation. These parts are compatible with many GM, Ford, Chrysler, Dodge and other domestic models for interior, exterior and under-hood applications.

What exactly is included in this Rexka kit?

The kit contains 10 indented hex head sems body bolts and 10 compatible U-nuts. Each bolt is 5/16-18 x 7/8" with a captive washer and black phosphate coating; each U-nut is sized for 5/16-18 threads and also black phosphate finished.

• 10 x 5/16-18 indented hex sems bolts, 7/8" length, washer O.D. 3/4"
• 10 x 5/16-18 U-nuts, black phosphate
• Hex size for bolts: 1/2"
• Intended for bodywork, trim, radiator and interior/exterior panels

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

These parts are designed for general-purpose body fastening rather than high-stress structural uses. The black phosphate finish offers moderate corrosion protection and smoother assembly, and the captive washer on the sems bolts prevents washer loss during installation.

• Good for trim panels, fender liners, air intake covers and radiator shrouds
• Captive washer simplifies alignment and reduces assembly time
• Black phosphate reduces surface friction and improves longevity versus raw steel

Which makes and locations on a vehicle are they suited for?

These 5/16 fasteners match many common attachment points on American-made cars and trucks. They fit a broad range of GM, Ford, Chrysler and Dodge applications where 5/16-18 threads are specified, such as pickups, SUVs and sedans for both interior and exterior trim tasks.

• Compatible with GM, Ford, Chrysler, Dodge body panels and accessories
• Useful for radiator mounts, pickup bed hardware and intake bracketry
• Also handy for DIY projects and general repairs around the garage

How should I install and care for these fasteners?

Install the U-nut onto the sheet-metal flange, align the part to be fastened, and drive the sems bolt through until the captive washer seats. Avoid over-torquing; these are intended for panel retention rather than structural joints. Keep spare bolts dry and store in original packaging to limit surface oxidation.

• Hand-start bolts to avoid cross-threading, then tighten with a 1/2" wrench
• Do not exceed typical panel fastener torque—check vehicle manual if unsure
• Replace damaged U-nuts to ensure secure fit; reuse bolts if undamaged

Who is this for? If you restore or repair domestic vehicles, maintain a fleet, or handle regular DIY automotive projects, this Rexka kit provides common-size hardware so you can replace lost or damaged fasteners quickly. It’s particularly useful for body shops, mechanics, pickup owners and hobbyists who need a small but versatile supply of 5/16" sems bolts and matching U-nuts for trim, radiator, intake and general attachment points.