BBSC56 4" x 4" BALL BEARING .130 SQ. CORNER HINGE
BBSC56 4-Inch x 4-Inch Square-Corner Ball Bearing Hinge
Usually Ships: 1-3 Business Days
Our BBSC56 Ball Bearing Hinge combines a 4-inch height x 4-inch open width with square corners and .130-inch leaf thickness. Its standard-weight, two ball bearing, full-mortise construction suits projects calling for this hinge size and preparation. Choose a listed finish to coordinate with the opening and verify the complete hinge specification against the actual door.
Practical Uses
- Commercial interiors: Use where the hardware schedule specifies this standard-weight bearing configuration.
- Square-corner replacements: Match the open dimensions, thickness, mortise, and screw positions before ordering.
- Hardware refreshes: Coordinate the hinge finish with locks, levers, and other visible fittings.
- New preparation: Recess both leaves using the actual hinge and correct model drawing.
Everyday example: During an office-door refurbishment, an installer replaces a worn 4-inch hinge. Before selecting BBSC56, the installer checks the square-corner recess, .130-inch leaf thickness, and attachment pattern. After fitting the complete hinge set, the door is tested for even gaps, free swing, closing, and latching. Checking the existing preparation avoids treating a rounded or thicker hinge as a direct substitute.
Size and Fit
4 inches high x 4 inches open width: Width is measured across both leaves with the hinge open, not across a single leaf.
Square corners: Match the leaf outline to the actual door and frame recesses. A round-corner preparation may require a different model or approved preparation work.
Full mortise and .130-inch thickness: One leaf is recessed into the door edge and one into the frame. Confirm both leaves seat correctly without changing the operating gaps or causing binding.
Finish Options
- US26D Satin Chrome
- US1 Matte Black
- US10 Satin Bronze
- US10A
- US10B Antique Bronze Oiled
- US15 Satin Nickel
- US15A Satin Nickel Blackened
- US26 Bright Chrome
- US3 Bright Brass
- US4 Satin Brass
- US5 Antique Brass
- USP Primed Gray
- US32D Satin Stainless Steel
Select the required finish from the product options. Confirm the exact supplied base material where exposure conditions or a project specification makes that distinction important.
Installation Guidance
- Review the complete application: Check door height, width, weight, construction, use frequency, and closer requirements.
- Compare the actual hinge: Verify the BBSC56 drawing, recess depth, footprint, and hole pattern before drilling or machining.
- Support the door: Secure it during removal and fitting.
- Check attachment: Use fasteners suitable for the actual wood or metal preparation and confirm sound backing and adequate engagement.
- Align the hinge set: Seat the leaves correctly and keep axes aligned without forcing the door into position.
- Test the opening: Check free movement, gaps, closing, and reliable latching with all hardware in place.
Problems It Helps Address
- A matching bearing hinge is needed: Provides a standard-weight two-bearing option in a defined full-mortise format.
- Replacement preparation varies: Identifies square corners, open size, and leaf thickness for comparison.
- Visible finishes need coordination: Offers thirteen listed finish selections.
Product Details
- Part number: BBSC56
- Open size: 4 inches high x 4 inches wide
- Leaf thickness: .130 inch
- Corner style: Square
- Construction: Standard weight, two ball bearing
- Mounting: Full mortise
Care and Project Coordination
Inspect attachment, alignment, and free movement periodically. Use cleaning and lubrication methods appropriate for the supplied finish and bearings. Investigate recurring rubbing or sagging across the door, frame, and closer rather than expecting hinge replacement alone to correct the cause.
Confirm required hinge quantities and any specified non-removable-pin configuration before ordering. NRP uses a retaining set screw to help prevent pin removal while the door is closed. For rated openings, verify the exact supplied hinge and installation against the complete assembly requirements.
