16-Pack BHCS 5/16"-18 x 5/8" Button Head Cap Screws | Grade 8 Black Zinc

Replacement button head cap screws — a bag of 16, sized 5/16"-18 x 5/8". These high-strength Grade 8 / 10.9 black zinc bolts are the same hardware we ship with our XTR bed racks and MOLLE accessories, so you can replace a lost fastener or expand your build with confidence.

• Quantity: 16 screws per bag
• Type: Button Head Cap Screw (BHCS), socket / hex drive
• Thread: 5/16"-18 (coarse)
• Length: 5/8"
• Grade: Grade 8 / 10.9 (high tensile strength)
• Finish: Black zinc — corrosion-resistant and matte black to match your rack

The low-profile button head sits flush and clean against T-slot extrusion, MOLLE panels, and bracket hardware. Pairs with our 5/16-18 drop-in T-nuts for fast, no-weld mounting anywhere along the rack.

Common uses: bed rack assembly, MOLLE panel mounting, accessory and bracket installs, and any 5/16-18 T-slot or threaded application that needs a strong, clean-looking fastener.

Questions about fitment or bulk quantities? Email support@xtrusiondesigns.com.