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Door Hinges
Frequently Asked Questions
What are door hinges?
Door hinges are pivoting hardware components that connect a door to its frame, allowing smooth swinging motion. At National Lock Supply, we offer a full range of hinges, including spring, commercial, continuous, pivot, and electrified models, all engineered for residential, commercial, and institutional use.
What types of hinges exist?
The main types include butt hinges (standard), spring hinges (self-closing), continuous hinges (full-length piano hinges), pivot hinges (heavy-duty pivots for tall doors), and electrified hinges (with concealed wiring for access control). Each serves different structural and security needs.
How are hinges graded?
By ANSI/BHMA standards, with Grade 1 hinges tested for millions of cycles to meet the highest durability requirements in commercial use, while Grade 2 and 3 serve lighter-duty openings.
What materials are used?
Steel, stainless steel, brass, and aluminum. Stainless steel resists corrosion for exterior or wet conditions, while brass and bronze are chosen for decorative and architectural applications.
What finishes are available?
Common finishes include Satin Chrome, Bright Brass, Oil-Rubbed Bronze, Matte Black, and Stainless Steel, allowing hinges to match other door hardware.
Are hinges ADA compliant?
Yes, when installed to provide required clearances for accessible openings, especially on doors in public buildings.
Where are they used?
Everywhere from residential doors and offices to schools, hospitals, and commercial fire doors, depending on hinge type and duty rating.
What is a ball bearing hinge?
A ball bearing hinge uses bearings between knuckles to reduce friction, offering smoother, quieter swing and extended durability on heavy or frequently used doors.
Are hinges fire-rated?
Yes. Fire-rated doors must use UL-listed hinges that meet cycle and heat resistance requirements under NFPA codes.
Why buy door hinges from National Lock Supply?
We stock Grade 1 hinges in multiple sizes, materials, and finishes, with expert support to match your door type, frame material, and compliance needs.