Hager BB1191 4-1/2" x 4-1/2" Ball Bearing, Rust Resistant, Hinge

The Hager BB1191 is a full mortise, five-knuckle, ball bearing commercial hinge in a rust-resistant build, 4-1/2" x 4-1/2". What sets the BB1191 apart from a standard steel hinge is the material: it's made from brass or stainless steel with a stainless steel pin, so it resists corrosion in environments where a plain steel hinge would rust. That makes it the right hinge for exterior doors, entrances, bathrooms, pool areas, coastal buildings, and anywhere moisture is a factor. It's a standard weight hinge for medium-weight doors and medium-frequency service, and it ships as a single hinge with the mounting screws included.

Why choose a rust-resistant hinge

This is the BB1191's whole reason for being, so it's worth understanding. A standard commercial hinge (like Hager's steel BB1279) is fine for dry interior openings, but on a door exposed to weather, humidity, or washdown, plain steel corrodes: the finish breaks down, the hinge stains the door and frame, and the bearings eventually bind. The BB1191 solves that by building the hinge from corrosion-resistant material, brass or stainless steel, with a stainless steel pin that won't rust inside the barrel. For an exterior entrance, a restroom, a locker room, a kitchen, or a building near salt air, that corrosion resistance is what keeps the door swinging smoothly and looking right for years.

Pick the stainless steel version where you also need a fire rating, the stainless model complies with NFPA80 for use on fire-rated door assemblies.

Ball bearing construction for smooth, lasting operation

The BB1191 is a five-knuckle, ball bearing hinge, the standard commercial construction. The two ball bearings carry the door's weight and let it swing smoothly with minimal friction, which is what allows it to handle medium-frequency commercial traffic without wearing out like a plain-bearing residential hinge would. The pin is a non-rising removable pin with a button tip and plug for a finished look. The hinge is full mortise, meaning both leaves recess into the door and frame so they sit flush, the standard mounting for hollow metal and solid core wood commercial doors.

Hager BB1191 specifications

• Type: Full mortise, five-knuckle, ball bearing commercial hinge. Rust resistant.

• Size: 4-1/2" x 4-1/2" (114 x 114 mm). Also available 3-1/2" x 3-1/2" and 4" x 4".

• Material: Brass with stainless steel pin (ANSI A2112), or stainless steel with stainless steel pin (ANSI A5112).

• Bearings: Two ball bearings.

• Pin: Non-rising removable pin with button tip and plug.

• Weight rating: Standard weight, medium-weight doors / medium-frequency service.

• Gauge: 0.134.

• Holes: 8.

• Fasteners: Wood screws 1-1/4 x 12 and machine screws 1/2 x 12-24 included.

• Fire rating: Stainless steel model complies with NFPA80 for fire-rated assemblies.

• Finishes: US3 bright brass, US10B oil rubbed bronze, US10D black nickel oiled, US26 bright chrome, US26D satin chrome, US32D satin stainless steel.

• Packaging: Sold individually (1 each) with screws.

Why choose the Hager BB1191

Hager is one of the most established hinge manufacturers in North American commercial construction, and the BB1191 is its standard-weight rust-resistant ball bearing hinge. You get corrosion-resistant brass or stainless construction, smooth ball bearing operation rated for commercial traffic, and a full range of architectural finishes to match the opening. For any door where moisture or weather is a factor, the BB1191 is the hinge that holds up where a standard steel hinge would corrode, and the stainless version adds fire-rated capability.

One thing to confirm before ordering: match the hinge size to your door (4-1/2" x 4-1/2" is standard for 1-3/4" commercial doors), choose brass or stainless based on your environment and whether you need the fire rating, and select your finish. On outswing exterior doors, consider the BB1191-NRP (non-removable pin) version so the pin can't be pulled when the door is closed.

Order the Hager BB1191 from American Locksets

We stock the full Hager BB1191 hinge line from authorized distribution, so every hinge ships with the manufacturer warranty. Compare sizes and finishes in the five knuckle ball bearing hinges category, or browse all door hinges.