BB3300 4-1/2x4-1/2 HEAVY WEIGHT CONCELED BEARING HINGE
BB3300 Heavy-Weight Concealed Ball Bearing Hinge, 4-1/2 Inches x 4-1/2 Inches
Usually Ships: 1-3 Days
Our BB3300 Heavy-Weight Concealed Ball Bearing Hinge combines a 4-1/2-inch x 4-1/2-inch full-mortise format with .190-inch leaf thickness. Its concealed-bearing arrangement suits commercial projects calling for a heavy-weight hinge while keeping the bearing components within the assembly. Choose US10B Antique Bronze Oiled or US32D Satin Stainless Steel from the listed options.
Where BB3300 Fits
- Heavier commercial doors: Use when the actual door and project schedule call for a heavy-weight concealed-bearing hinge.
- Frequently used openings: Coordinate hinge selection with traffic frequency, closer requirements, door construction, and the complete hardware set.
- Maintenance replacements: Compare the existing hinge size, thickness, hole pattern, and mounting arrangement before ordering.
- New door and frame preparation: Prepare both mortises for the specified hinge rather than adapting an unrelated recess by nominal size alone.
Everyday example: A busy office corridor door needs a new hinge set. The installer checks the door weight, closer, and existing preparations, then confirms that BB3300's .190-inch leaves match the required mortise depth. After fitting the complete set, the installer checks even gaps, free swing, and reliable latching. This avoids treating a heavy-weight hinge as a drop-in replacement for a thinner leaf without checking the preparation.
Size and Construction
4-1/2 inches high x 4-1/2 inches open width: The second dimension is measured across both leaves with the hinge open. Check this full footprint against the actual door and frame.
.190-inch thickness: Match the leaf thickness to the mortise depth. Using a thicker hinge in a shallower recess can alter alignment and operating clearances.
Full-mortise mounting: One leaf is recessed into the door edge and the other into the frame. Both preparations must support the hinge correctly with sound attachment and aligned hinge axes.
Finish Options
- US10B: Antique Bronze Oiled
- US32D: Satin Stainless Steel
Select the required finish and confirm the exact supplied material for the project's exposure conditions. Finish appearance alone should not be used to establish suitability for corrosive environments or a particular rated assembly.
Installation Planning
- Review the application: Check door height, width, weight, operating frequency, closer forces, and the project's hinge schedule.
- Verify the preparation: Compare leaf dimensions, .190-inch thickness, screw positions, and edge geometry before machining or replacing hardware.
- Support the door: Secure it during removal and fitting so its weight is not carried by a partially installed hinge set.
- Use the appropriate screws: The template references eight #12 x 1-1/4-inch wood screws and eight #12-24 x 1/2-inch machine screws. Select the appropriate fastener type for the actual preparation and confirm sufficient engagement.
- Align and test: Check that the leaves seat correctly, hinge axes align, and the door swings, closes, and latches without rubbing or binding.
Problems It Helps Address
- The opening calls for heavy-weight bearing hinges: Provides a concealed-bearing option with a documented .190-inch leaf.
- Replacement thickness is uncertain: Identifies the thickness and open size for a meaningful preparation check.
- Hardware needs a coordinated finish: Offers two listed selections without changing the required hinge format.
Product Details
- Part number: BB3300
- Nominal open size: 4-1/2 inches high x 4-1/2 inches wide
- Leaf thickness: .190 inch
- Weight class: Heavy weight
- Bearing type: Concealed ball bearing
- Installation: Full mortise
Confirm the required hinge quantity and any non-removable-pin option before ordering. NRP uses a retaining set screw to help prevent pin removal while the door is closed; do not assume it is included in a standard finish selection. For a rated opening, verify the exact supplied hinge and installation against the complete assembly requirements.
Care and Technical References
Check fastener security, alignment, and free movement during maintenance. Use cleaning and lubrication methods appropriate for the supplied finish and bearing assembly. Investigate persistent sagging or binding at the door and frame rather than relying on repeated hardware adjustment alone.
