5/16"-18 X 4-1/2" Machine Screws | Round Head | Slotted Drive | Steel Zinc Plated (300/Pkg.)

Engineered for strength and reliability, our Machine Screws Slotted Round Zinc Plated 5/16-18 x 4 1/2 in. are versatile fasteners designed for precise, secure assembly in metal-to-metal applications. The zinc plating provides corrosion resistance for everyday use in interior and shielded environments.

Key features:

• Head style: Slotted Round – accepts standard flat-head screwdrivers, ideal for assemblies where a smooth, rounded profile is required.
• Thread: 5/16-18 UNC threads for common metal-to-metal mounting.
• Length: 4 1/2 in. overall, providing ample reach in thicker materials.
• Finish: Zinc plated for light to moderate corrosion resistance and a clean appearance.
• Material: Steel, designed for durable performance in hardware projects, cabinetry, equipment panels, and machinery.

Applications:

• Machine assemblies, equipment enclosures, electrical panels, and fixtures where a slotted round head screw is appropriate.
• Repair or replacement projects requiring a common 5/16-18 thread size.

Why choose these screws? Fast, reliable engagement, consistent thread quality, and a finish that resists tarnish in indoor settings. Each screw is manufactured to tight tolerances to ensure easy driving and secure clamping without cross-threading.

For best results, pair with compatible nuts or hardware and use the appropriate screwdriver bit to prevent slippage. If you're stocking fasteners for metalworking projects, these 5/16-18 x 4 1/2 in slotted round machine screws are a dependable choice that blends performance and value.