National Marker N221218 Zinc Eye Bolt with Hex Nut

Product Description

The NATIONAL MARKER N221218 is a zinc-plated eye bolt with an assembled hex nut, sized at 5/16 inch diameter by 3-1/4 inches in length. It features machine screw threads and ships fully assembled with the hex nut in place, reducing prep time on the job. The zinc plating provides corrosion resistance suitable for both interior and exterior environments. Fabricated from steel wire, it delivers reliable tensile strength for light-duty fastening, hanging, and rigging tasks. This type of hardware is commonly installed by general contractors, electricians, and maintenance tradespeople during rough-in and finish work across residential and light commercial projects.

This eye bolt is rated for home and industrial applications and performs in both indoor and outdoor settings. The machine screw thread pattern is compatible with standard hex nuts and works in wood, metal, and similar substrates when used with appropriate anchoring hardware. Its compact 5/16-inch shank diameter makes it well suited for light load-bearing hang points, cable routing, and tie-off anchors where a looped fastener is required. Part of the catalog model 2160BC series.

Key Features

• 5/16 inch diameter by 3-1/4 inch length for versatile fastening applications
• Zinc plating provides corrosion resistance for interior and exterior use
• Machine screw threads with hex nut included and pre-assembled
• Steel wire construction for reliable strength in light-duty load applications
• Suitable for residential and industrial environments

Compatibility

Designed as a standard 5/16 inch machine screw thread eye bolt compatible with matching hex nuts and general-purpose anchoring applications in wood or metal substrates across residential and light commercial installations.

Installation Notes

Installation is typically performed by general maintenance technicians, electricians, or contractors using basic hand tools. Always ensure the substrate material and anchor method are rated for the intended load before fastening. Power down any nearby electrical circuits before working in proximity to wiring runs. Thread engagement should be sufficient to seat the hex nut fully against the mounting surface for a secure hold.

Technical Specifications

• Diameter: 5/16 inch
• Length: 3-1/4 inches
• Thread Type: Machine screw
• Material: Steel wire with zinc plating
• Hardware Included: Hex nut, assembled
• Weight: 0.099 pounds
• Series: 2160BC
• Unit of Measure: Each

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N221218