Cal-Royal BBSC56 Full Mortise, Standard Weight, Two Ball Bearing Hinge, 4" x 4" - Template - Box Of 3

The Cal-Royal BBSC56 is a standard-weight commercial ball bearing hinge sized 4" × 4" with template-prepared full mortise installation, sold in boxes of 3. Two-ball-bearing construction with one set in the upper barrel and one set in the lower delivers smooth operation under average commercial cycling. Five-knuckle full mortise design with a non-rising removable pin standard. .130 gauge steel, stainless steel, or brass body construction depending on finish ordered. Eight machined screw holes total (four per leaf) with full sets of both 1 × 12 wood screws and 1/2 × 12-24 machine screws included in the box, so the hinge installs in either wood or hollow metal frames without separate hardware ordering. Available in 13 BHMA finish/configuration combinations. Box of 3 covers one standard commercial door (top, middle, bottom hinge positions). 

Where the BBSC56 Fits in the Cal-Royal Hinge Family

Cal-Royal Products is a U.S. commercial hardware manufacturer (Los Angeles, in business since 1986) known for value-engineered architectural hardware that meets the same ANSI/BHMA grade specifications as Hager, McKinney, Stanley, and Bommer at a meaningfully lower price point. Within Cal-Royal's standard-weight ball bearing hinge family, the BBSC56 is the 4" × 4" size variant. The same standard-weight tier is also available in the larger 4-1/2" × 4" size as the Cal-Royal BB454. For heavier-duty applications stepping up to 4 ball bearings, .180 gauge metal, and 4-1/2" × 4-1/2" prep, see the Cal-Royal BB5200 heavy-weight variant. Across the family, sizing matters -match the hinge size to the existing door and frame mortise prep, or to the spec'd cutout on new construction. For the broader Cal-Royal hinge lineup, see the Cal-Royal 5 Knuckle Ball Bearing category within Five Knuckle Ball Bearing under Commercial Hinges in Door Hinges.

BBSC56 Specifications

• Function: full mortise commercial ball bearing hinge for door-to-frame applications, standard weight rating

• Quantity: box of 3 (one door's worth of hinges in standard commercial 3-hinge configuration)

• Hinge size: 4" × 4" (4" door leaf height, 4" total open width)

• Knuckle configuration: 5-knuckle full mortise template prep

• Bearings: 2 ball bearings (one set upper barrel, one set lower)

• Gauge of metal: .130

• Number of holes: 8 total (4 per leaf)

• Hardware included: full sets of both 1 × 12 wood screws and 1/2 × 12-24 machine screws (sufficient for either wood frame or hollow metal frame installation)

• Material options by finish: steel for plated finishes (USP, US1, US26D, US26, US3, US10A, US10B, US4, US15, US5), brass for solid brass finishes, stainless steel for US32D and US32DNRP variants

• ANSI/BHMA performance ratings: Brass A2112, Steel A8112, Stainless Steel A5111

• Pin: non-rising removable pin standard, NRP (Non-Removable Pin) variants available in select finishes for added pin-pulling resistance

• Mortise prep: template prep (standardized cutout matching industry frame and door routing)

• Compatible door weights: standard weight, average frequency commercial service

Available Finishes (13-Option BHMA Variant List)

The BBSC56 ships in 13 distinct finish/configuration combinations, two more than the 4-1/2" × 4" BB454 sibling:

• USP -Prime Coat (base finish, ready for field paint)

• US1 -Flat Black Coated

• US26D -Satin Chrome (BHMA 626) -most-specified commercial finish

• US4 -Satin Brass (BHMA 606)

• US10 -Satin Bronze (BHMA 612)

• US10A -Antique Bronze

• US10B -Oil Rubbed Bronze (BHMA 613)

• US15 -Satin Nickel (BHMA 619) -BBSC56-specific finish, not available on BB454

• US15A -Antique Satin Nickel

• US5 -Satin Brass Oxidized -BBSC56-specific finish, not available on BB454

• US3 -Bright Brass (BHMA 605)

• US26 -Bright Chrome (BHMA 625)

• US32D -Satin Stainless Steel (BHMA 630) -corrosion-resistant for healthcare and exterior coastal applications

The wider finish range on the BBSC56 (vs the BB454) makes this product the right call when matching to a specific architectural color spec across a multi-door schedule. US15 Satin Nickel in particular is common in upscale commercial and contemporary residential conversions where the broader Cal-Royal hinge family's standard finishes don't match the door hardware aesthetic.

When to Specify the BBSC56

Three conditions point to specifying this hinge. First, the door is a standard-weight commercial door (1-3/4" thick or thinner, weighing under 175 lbs typical). Second, the existing or new-construction door prep is 4" × 4" template (smaller than the more common 4-1/2" × 4" commercial prep -common in older buildings, residential-grade commercial doors, light commercial interior doors, and pre-1990s construction where the smaller hinge prep was standard). Third, the opening sees average frequency cycling (200-600 daily uses).

If the door prep is 4-1/2" × 4" instead, specify the BB454 standard-weight 4-1/2" × 4" hinge instead. If the application sees high-frequency cycling (entrance doors, corridors, hospital service doors, 1,000+ daily uses), step up to the BB5200 heavy-weight 4-1/2" × 4-1/2" four-ball-bearing variant. The most important factor in the BBSC56-vs-BB454 decision is the actual mortise dimension on the existing door -measure before ordering replacements. Get it wrong and the hinge won't fit the routed cutout.

Comparable Alternatives in the Catalog

For competitive comparison shopping in the same 4" × 4" size class, see the Hager BB1279 4" × 4" 5-Knuckle Steel Hinge, the Hager BB1279-NRP 4" × 4", the Hager BB1191 4" × 4", and for round-corner door prep applications the Hager RCBB1279 4" × 4" Round Corner. For specialty applications including hospital corridors where pin-end exposure catches IV poles or wheelchair handles, see the Hager HTBB1279 with Hospital Tip.