A type of hinge with interlocking cylindrical sections (knuckles) that form the pivot mechanism, commonly used in doors, gates, and heavy-duty applications requiring durable, smooth operation.

A knuckle hinge is a type of hinge with interlocking cylindrical sections (knuckles) that form the pivot mechanism, commonly used in doors, gates, and heavy-duty applications requiring durable, smooth operation. The knuckles are alternating cylindrical sections from each hinge leaf that interlock and are held together by a removable or fixed pin, creating a strong and reliable pivot point. Knuckle hinges are among the most common and versatile hinge types in construction, offering excellent load-bearing capacity and smooth operation.

The primary purposes include providing smooth pivoting motion for doors and gates, supporting heavy loads with reliable operation, offering easy installation and maintenance, enabling removable pin access for door removal, providing long-lasting durability in various environments, meeting architectural and functional requirements, and ensuring secure and stable door operation.

Construction and components involve hinge leaves, knuckles, hinge pins, and mounting hardware for complete hinge assemblies.

Fun Fact: The knuckle hinge design is over 5,000 years old, with bronze examples found in ancient Egyptian tombs! The interlocking knuckle design is so efficient that it’s remained virtually unchanged for millennia. Some heavy-duty knuckle hinges can support over 1,000 pounds per hinge. Interestingly, the number of knuckles affects both strength and appearance – most door hinges have 5 knuckles (3 on one leaf, 2 on the other) for optimal balance of strength and smooth operation!

• Hinge