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The NATIONAL MARKER N146951 is a 3-inch non-mortise panel hinge designed for surface-mount installation on bi-fold doors. Sold in a 2-count pack, this hinge features a non-removable, tight, non-rising pin that stays secure through repeated door cycles. Surface mounting eliminates the need for mortising, reducing installation time on doors at least 1 inch thick. It is suited for residential cabinet and door applications where a clean, straightforward fastening solution is required without routing or chiseling the door or frame.
This hinge is intended for bi-fold door installations in residential settings. The surface-mount design makes it accessible for carpenters, finish contractors, and experienced DIYers working on interior door projects. Because no mortising is required, it can be applied directly to the door face and frame surface, making it a practical choice for retrofit installations or new construction where door thickness meets the minimum 1-inch requirement.
Designed as an OEM-style surface-mount replacement hinge for bi-fold doors with a minimum thickness of 1 inch. Corresponds to National catalog model V530.
Installation is performed by carpenters or general contractors using standard hand tools. Power down any associated door hardware or automated systems before servicing. Fasten the hinge directly to the door and frame surface without mortising. Verify door thickness meets the 1-inch minimum before mounting to ensure proper hinge seating and pin alignment.
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