National Mfg N140-566 Plain Steel Tight Pin Hinge 3x3.5in 10pk

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N140-566 is a plain steel tight pin hinge engineered for full mortise door installations. Manufactured from cold rolled steel with a swaged leaf design, this hinge delivers consistent alignment and a flush fit in mortise cutouts. The non-removable, riveted pin adds security by preventing pin-side entry on installed doors. Each hinge features a 5-knuckle configuration, contributing to smooth pivot action and even load distribution across the joint. This package contains 10 hinges, making it suitable for multi-door projects or stocking a service van for finish carpentry and door hanging work.

This hinge is used in residential and light commercial door installations where a mortise-style hinge pocket is required. The full mortise design seats flush within the door edge and jamb, producing a clean finished appearance. Carpenters, remodelers, and general contractors typically specify this type of hinge for interior doors, closet doors, and similar swinging door applications requiring a plain, uncoated steel finish. The 3 x 3.5-inch leaf size suits standard interior door widths commonly found in residential construction.

Key Features

• Full mortise design seats flush in door edge and jamb cutouts for a clean installation
• Swaged leaves allow proper alignment and reduced gap between door and frame
• Non-removable, riveted tight pin enhances security and prevents disassembly on the hinge side
• 5-knuckle construction provides even load distribution and smooth pivot action
• Cold rolled steel construction offers consistent material quality throughout
• Package quantity of 10 units supports multi-door jobs or stock replenishment

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard full mortise door applications requiring a 3 x 3.5-inch plain steel hinge.

Installation Notes

Installation is performed by carpenters or general contractors using standard woodworking chisels and screwdrivers or a drill driver. Mortise pockets in both the door edge and door jamb must be routed or chiseled to the correct depth before seating the hinge leaves. Ensure the door is fully supported and plumb before driving fasteners to prevent binding. Follow applicable local building codes for door hardware requirements on fire-rated or egress door assemblies.