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The NATIONAL MARKER N151118 is a zinc extra-heavy door barrel bolt designed for high-security latching on farm buildings, sheds, stockrooms, and heavy-duty door applications. Built from zinc for corrosion resistance, this 5-inch barrel bolt installs surface-mounted and includes both surface and universal strikes, giving installers flexibility on a range of door types. The bolt accepts a padlock for added security, making it suitable for any location where unauthorized access is a concern. Carpenters, maintenance technicians, and general contractors handle installation on both interior and exterior doors.
This barrel bolt is intended for use on farm buildings, storage sheds, stockrooms, utility rooms, and other heavy-duty door installations where a robust, lockable latch is required. The included surface and universal strikes accommodate different door frame configurations, reducing the need for additional hardware. Mounting with carriage bolts is supported for applications requiring greater pull-out resistance.
Designed as an OEM-style replacement or direct-install barrel bolt for heavy-duty swinging doors on farm buildings, sheds, stockrooms, and similar structures requiring a surface-mounted slide latch.
Installation is performed by carpenters, maintenance technicians, or general contractors using standard hand tools. Power down any electric door hardware and ensure the door is fully closed and stationary before marking and drilling mounting holes. Carriage bolts may be used in place of wood screws for maximum pull-out resistance on high-traffic or high-security doors. Verify that the strike plate is aligned with the bolt path before final fastening.
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