National Marker N100051 Spring Door Hinge 3 in Satin Nickel

Product Description

The NATIONAL MARKER N100051 is a double-acting spring hinge designed for swinging door applications requiring two-way access and self-closing operation. Built from cold-rolled steel with a satin nickel finish, this 3-inch hinge features an adjustable tension pin that allows the installer to dial in the desired closing speed. Mounting screws are included. This hinge suits commercial and residential door installations where hands-free, automatic return is required on a bi-directional swinging door.

This hinge is suited for interior swinging doors in commercial buildings, healthcare facilities, restaurants, and similar environments where doors must swing in both directions and close automatically. It is commonly installed on kitchen pass-through doors, service corridor doors, and utility room entries. The included screws simplify installation and reduce trip-to-supply-house requirements for single-door service calls.

Key Features

• Double-acting operation allows door to swing in both directions
• Self-closing spring mechanism eliminates the need for a separate door closer
• Adjustable tension pin controls closing speed to suit the application
• Cold-rolled steel construction provides durable, long-term performance
• Satin nickel finish for a clean, low-glare appearance
• Mounting screws included

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard swinging interior doors requiring double-acting, self-closing hardware. Corresponds to National catalog model V127.

Installation Notes

Installation is typically performed by a finish carpenter, door hardware installer, or general contractor following local building codes. Before installation, verify door thickness and frame material are appropriate for the hinge size and fastener type. Use a proper mortise chisel and screwdriver or screw gun to seat the hinge leaves flush with the door edge and frame. Adjust the tension pin only after the door is fully hung and confirmed to swing freely in both directions.