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The NATIONAL MARKER N221705 is a zinc-finish hook bolt designed for secure fastening applications in light construction, utility, and general trade work. Measuring 3/8 inch in diameter and 10 inches in length, this hook bolt ships assembled with two hex nuts included in the box pack. The steel construction with zinc plating provides corrosion resistance for both indoor and sheltered outdoor installations. This hardware is commonly installed by electricians, plumbers, HVAC technicians, and general contractors when hanging pipe, conduit, or mechanical components from structural members.
This hook bolt is suited for residential and light commercial fastening tasks where a threaded hook-style anchor point is needed. The included hex nuts allow for immediate installation without sourcing additional hardware. The zinc finish makes it appropriate for dry or low-moisture environments. It is sold as a single assembled unit with hardware included.
Designed as an OEM-style replacement and general-use fastener suitable for standard 3/8 inch threaded hook bolt applications in mechanical, electrical, and plumbing installations.
Installation is typically performed by licensed tradespeople or experienced DIYers using standard hand tools. Ensure the anchor substrate is rated for the intended load before installation. Follow applicable building codes and manufacturer torque guidance for threaded fasteners in structural applications. Inspect the zinc finish for any damage before use in moisture-prone environments.
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