National Marker N179150 Black Zinc Lag Screw 6 Pack

Product Description

The NATIONAL MARKER N179150 is a black zinc lag screw designed for fastening heavy-duty ornamental hardware to wood substrates. Each screw measures 5/16 inches in diameter by 1.5 inches in length and features a steel core with a zinc-plated base and a satin black painted finish. The finish is matched to complement painted ornamental hardware, keeping installations looking consistent and clean. Licensed trade professionals and skilled installers use these fasteners when mounting decorative hinges to gates, doors, and fencing where a finished black appearance is required. Each pack contains 6 screws.

These lag screws are specifically intended for use with heavy-duty ornamental strap hinges and heavy-duty ornamental T-hinges. They are suited for residential and light commercial applications including wood fence gates, barn doors, and decorative entry installations. The 5/16-inch diameter shank provides solid bite into dimensional lumber and timber framing common in these install scenarios. The satin black finish integrates visually with painted black hinge hardware without requiring additional touch-up.

Key Features

• Steel construction with zinc plating for corrosion resistance
• Satin black painted finish matched to ornamental hardware finishes
• 5/16-inch diameter by 1.5-inch length for solid wood fastening
• Designed for use with heavy-duty ornamental strap and T-hinges
• 6 screws included per pack

Compatibility

Designed for use with NATIONAL MARKER heavy-duty ornamental strap hinges and heavy-duty ornamental T-hinges. Intended for wood substrate installations where a matching black fastener is required.

Installation Notes

Lag screws of this type are installed by carpenters, fence installers, and general contractors using a socket wrench or impact driver with the appropriate socket size. Pre-drilling a pilot hole into the wood substrate is standard practice to prevent splitting, especially near the end grain. Do not overtighten, as this can strip the wood fibers and reduce holding strength. Always confirm the hinge and fastener combination meets the load requirements for the intended application before installation.

Technical Specifications

• Diameter: 5/16 inches
• Length: 1.5 inches
• Material: Steel with zinc plating and satin black painted finish
• Quantity per Pack: 6
• Weight: 0.242 pounds
• UPC: 00038613179158

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N179150