BB54-5" x 4" Full Mortise Hinge
Usually Ships: 1-3 Business Days
BB54 5 x 4-Inch Standard-Weight Ball-Bearing Hinge
Our BB54 full-mortise hinge provides a 5 x 4-inch size, .146-inch leaf thickness, and two ball bearings. Choose this standard-weight architectural hinge where the actual door duty, preparation, and hardware schedule call for its bearing configuration.
Specifications and Selections
- Model: BB54.
- Size: 5 x 4 inches.
- Thickness: .146 inch.
- Construction: Standard weight, two ball bearings, five-knuckle template type.
- Mounting: Full mortise, one leaf recessed into the door and the other into the frame.
- Current finishes: US26D Satin Chrome, US32D Satin Stainless Steel, US10A, US3 Bright Brass, and USP Primed Gray.
- Ordering: Priced and sold individually as each; catalog inner-box quantity is three hinges. One each is not a three-hinge set.
Practical Uses
Consider our BB54 for compatible medium-frequency commercial doors and replacement work specified for standard-weight bearing hinges. Check the door's weight, dimensions, closer forces, environment, and required hinge arrangement. This model is distinct from a heavy-weight hinge with the same nominal height and width.
Everyday example: A technician replacing office-door hinges confirms the existing 5 x 4-inch leaves, .146-inch preparation, screw pattern, and reinforcement against the BB54 template. They install aligned hinges and check door gaps, closer action, and latching. Damaged mounting material is repaired separately rather than expecting a new hinge to correct it.
Installation Checks
- Verify the mortises: Match size, depth, screw positions, corner geometry, and reinforcement.
- Coordinate the opening: Confirm door duty, closer forces, hinge count, spacing, and operating clearances.
- Use the exact template: Nominal dimensions alone do not guarantee a direct replacement.
- Match fasteners: The template references #12-24 x 1/2-inch machine screws and #12 x 1-1/4-inch wood screws. Follow the supplied hardware and approved substrate preparation.
- Align and test: Keep hinge axes aligned and check free swing, secure fastening, closer operation, and latch engagement.
Materials, Pin Security and Rated Openings
Confirm the actual specified material as well as the finish. Our architectural family includes steel, stainless steel, and separately specified brass constructions. Plating does not make a steel hinge rustproof.
NRP means non-removable pin, a retaining feature that prevents pin removal with the door closed. Verify that ordering feature where required, particularly with exposed pins on outswing doors; do not assume an unmarked selection includes NRP. Special pins and tips require separate specification.
Our commercial catalog identifies UL-listed steel and stainless-steel BB54 hinges for swinging fire doors, with a 3-hour reference. Confirm the exact listed hardware, fasteners, preparation, and approved door-and-frame assembly. Do not transfer that reference to brass or treat the hinge alone as proof of a complete opening's rating.
Problems It Helps Address
- Standard-weight bearing requirements: Provides the documented .146-inch, two-bearing arrangement.
- Replacement matching: Identifies the actual size, thickness, and preparation reference.
- Worn movement: A correctly fitted replacement can help restore consistent hinge operation when the opening and mounting points are sound.
- Finish coordination: Offers the listed selections while keeping base-material verification separate.
Care and Matching Template
Inspect fastening, alignment, bearings, finish condition, and door gaps periodically. Correct sagging or binding rather than forcing operation. Follow supplied maintenance guidance and use finish-appropriate cleaning methods.
