5/16″-18 X 1-1/2″ Machine Screws Flat Head Slotted Drive Steel Zinc Plated (1250/Pkg.) Clearance

Machine Screws Slotted Flat Steel Zinc 5/16-18 x 1-1/2 are durable, precision-engineered fasteners designed for secure metal-to-metal connections. The slotted drive and flat head provide a flush, finished appearance in a variety of assemblies, from cabinetry and equipment housings to machinery and automotive applications. Crafted from steel and finished with zinc plating, these screws resist corrosion in everyday environments while delivering dependable strength.

Diameter: 5/16 in

Thread: 5/16-18 UNC

Length: 1-1/2 in

Head style: Slotted flat head

Material: Steel

Finish: Zinc plating

Drive: Slotted

These machine screws are best paired with a nut or a tapped hole sized for 5/16-18 threads. The countersunk head sits flush against the surface for a clean, professional look, while the durable zinc finish helps resist rust and corrosion in light to moderate environments. Ideal for hardware assemblies, enclosure panels, furniture hardware, and general repair projects.

Installation tips: Align the screw with the threaded hole, use a compatible flat-head screwdriver, and avoid overtightening to prevent thread stripping. If surface wear or softer materials are involved, pairing with a washer can help distribute load and protect the joint.