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The NATIONAL MARKER N830229 is a 3-inch satin brass door hinge designed for standard residential interior door installations. Built from steel with a satin brass finish, this round-corner hinge features a 0.25-inch corner radius and a removable pin for straightforward fitting and removal. Mounting screws are included in the package. This hinge is sold individually and is intended for light-duty residential use where a clean, finished appearance is required at each hinge location. Licensed contractors and experienced DIYers alike will find the removable-pin design speeds up door hanging and alignment tasks.
This hinge is suited for interior residential door applications where a standard 3-inch hinge footprint is specified. The 0.25-inch round corner radius matches common pre-mortised door and frame preparations found in residential construction. It is referenced as National Model 512RC and is appropriate for interior passage doors, closet doors, and similar light-duty swinging door assemblies. Minimum order quantity is 4 units per purchase, making it practical to source a full door set at once.
Designed as an OEM-style replacement or new-installation hinge for standard interior residential doors requiring a 3-inch, 0.25-inch round-corner hinge profile. Referenced as National Model 512RC in supplier documentation.
Installation is typically performed by a finish carpenter, general contractor, or experienced DIYer. Ensure the door and frame mortises are cut to the correct depth before seating the hinge leaves to avoid binding. Remove the hinge pin before hanging the door to simplify alignment of the two leaves. Follow applicable local building codes for door hardware installation in residential construction.
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