Ives 3SP1 4.5 x 4.5 Inch 3-Knuckle Spring Hinge

The Ives 3SP1 4.5 x 4.5 Inch 3-Knuckle Spring Hinge is a self-closing hinge engineered to automatically return doors to the closed position without the need for a separate door closer. Featuring a full mortise design with a square corner profile, this hinge suits both residential and light commercial openings where controlled, reliable closing is required. The adjustable spring tension lets you fine-tune the closing force to match the weight and swing of the door. Built for durability and smooth operation, the 3SP1 offers an economical self-closing solution that installs easily and performs consistently over years of daily use.

Features

• Self-closing spring mechanism eliminates the need for a separate door closer on many applications.
• Three-knuckle design provides a clean, traditional appearance with dependable alignment.
• Adjustable spring tension allows precise control of the door's closing force.
• Full mortise installation with a square corner for standard door and frame preparation.
• 4.5 x 4.5 inch size accommodates common interior and light commercial doors.

Functional Details

The 3SP1 uses an internal coiled spring within the hinge barrel to store energy as the door opens and release it to pull the door back to the closed position. Tension is set during installation using a tension pin and adjustment tool, giving the installer control over closing speed and force.

• Spring hinge provides controlled, self-closing action for the door.
• Adjustable spring tension to suit door weight and closing requirements.