BB545-5" x 4 1/2" Full Mortise Hinge
Usually Ships: 1-3 Business Days
BB545 5 x 4-1/2-Inch Standard-Weight Ball-Bearing Hinge
Our BB545 full-mortise hinge combines a 5 x 4-1/2-inch size, .146-inch leaf thickness, and two ball bearings. It is a standard-weight architectural hinge for compatible openings whose door duty, preparation, and hardware schedule call for this bearing configuration.
Specifications and Selections
- Model: BB545.
- Size: 5 x 4-1/2 inches.
- Thickness: .146 inch.
- Construction: Standard weight, two ball bearings, five-knuckle template type.
- Mounting: Full mortise, with one leaf recessed into the door and the other into the frame.
- Current finishes: US26D Satin Chrome, US32D Satin Stainless Steel, US26 Bright Chrome, US10A, US10B Antique Bronze Oiled, US3 Bright Brass, US4 Satin 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 BB545 for medium-frequency commercial doors and compatible replacement projects specified for standard-weight bearing hardware. Check actual door weight, dimensions, closer forces, environment, hinge count, and spacing. Equal nominal dimensions do not make standard- and heavy-weight hinges interchangeable.
Everyday example: A technician replacing office-door hinges measures the 5 x 4-1/2-inch leaves and checks the .146-inch mortise depth against the BB545 drawing. After confirming reinforcement and fastening, they align the hinges and test swing, closer action, and latching together. Loose mounting material and frame damage are repaired separately.
Installation Checks
- Verify preparation: Check mortise size and depth, screw positions, corner geometry, reinforcement, and clearances.
- Coordinate door duty: Confirm the required hinge count and spacing with door weight, size, use frequency, and closer forces.
- Use the exact template: Nominal size alone does not guarantee replacement compatibility.
- 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, door gaps, secure fastening, closer operation, and latch engagement.
Materials, Pin Security and Rated Openings
Confirm the actual material as well as the finish. Our architectural hinge family includes steel, stainless steel, and separately specified brass constructions. Plating does not make steel rustproof.
NRP means non-removable pin, a retaining feature that prevents pin removal with the door closed. Verify this ordering option where required, particularly with exposed pins on outswing doors. Do not assume NRP or special pins and tips are included in an unmarked selection.
Our commercial catalog identifies UL-listed steel and stainless-steel BB545 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 a hinge alone as proof of the complete opening's rating.
Problems It Helps Address
- Standard-weight bearing requirements: Provides the documented .146-inch, two-bearing configuration.
- Replacement matching: Identifies the actual size, thickness, and model-specific preparation.
- Worn hinge movement: A correctly fitted replacement can help restore consistent operation when the opening and mounting points are sound.
- Finish coordination: Offers the listed selections without assuming identical base materials.
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.
