National Marker N221689 Zinc Hook Bolt 5/16 X 5 in

Product Description

The NATIONAL MARKER N221689 is a zinc-finished steel hook bolt sized at 5/16 inches in diameter and 5 inches in length. Each unit ships assembled and includes two hex nuts, making it ready for immediate installation without sourcing additional fasteners. The hook configuration allows attachment to pipes, rods, beams, or structural supports where a threaded hang point is needed. The zinc finish provides corrosion resistance suitable for dry and moderately exposed environments. This fastener is used by plumbers, HVAC mechanics, electricians, and general contractors for hanging conduit, pipe, duct supports, and similar overhead assemblies.

This hook bolt is suited for light commercial and residential applications where a reliable threaded hook fastener is required. The included hex nuts allow for secure clamping against the mounting surface. It is sold individually, with a minimum order quantity of 10 units, making it practical for stocking job boxes or service trucks. The zinc coating makes it appropriate for interior and covered exterior installations where direct moisture exposure is limited.

Key Features

• 5/16 inches diameter x 5 inches length hook bolt
• Zinc finish over steel construction for corrosion resistance
• Ships assembled with two hex nuts included
• Ready-to-install fastener for pipe, conduit, and duct hanger applications
• Minimum order quantity of 10 units per purchase

Compatibility

Designed as a standard threaded hook bolt for use with pipe hangers, conduit supports, strut systems, and similar overhead fastening applications in residential and light commercial construction.

Installation Notes

Installation is performed by plumbers, HVAC technicians, and electricians as part of pipe and conduit hanging systems. Ensure the structural member receiving the hook bolt is rated for the intended load before fastening. Tighten the included hex nuts to secure the bolt against the mounting surface without over-stressing the base material. Follow applicable local building codes and NEC or IPC guidelines for hanger spacing and support requirements.

Technical Specifications

• Diameter: 5/16 inches
• Length: 5 inches
• Material: Steel with zinc finish
• Weight: 0.133 pounds
• Included Hardware: 2 hex nuts, assembled
• UPC: 00038613124127
• Minimum Order Quantity: 10

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N221689