Orca Hardware SSB4545 Stainless Steel Butt Hinge, 4-1/2" x 4-1/2" Square Corner Ball Bearing Commercial Hinge

Check the corner of the existing hinge or the mortise itself. The SSB4545 has square corners, which matches wood doors and frames routed with a square-corner template. If your hollow metal frame has rounded hinge pockets, a square corner hinge will not seat flat in the pocket and you need a radius corner hinge instead. Mixing the two is the most common reason a replacement hinge will not sit flush.

No. It is built with a non-removable pin, so the pin cannot be driven out once the hinge is installed and the door is hung. That is a security feature for out-swinging doors where the barrel is exposed on the unsecured side, but it also means you cannot lift the door off by pulling pins for painting or moving furniture. If crews need to pull the door regularly, specify a removable pin hinge instead.

The SSB4545 is rated medium duty, standard weight. That covers normal commercial traffic such as offices, classrooms, and interior corridor doors. For a main entrance, a heavy door with a closer, or an opening cycling constantly all day, step up to a heavy weight ball bearing hinge instead of this one.

The Design Hardware BB5 4 inch x 4 inch standard weight ball bearing hinge is the match for a 4 inch prep. It is a ball bearing hinge at medium duty, the same duty level the Orca SSB4545 carries, but the SSB4545 is sized 4.5 inch x 4.5 inch. Hinge leaf size has to follow the mortise already cut in the frame and door edge, so measure the existing cutout before choosing between them.

For pin security the Orca SSB4545 is the one to specify. It is supplied with a non-removable pin, which is what an out-swinging exterior or secured opening usually calls for. The Design Hardware BB5 is described as a 4 inch x 4 inch standard weight ball bearing hinge without that pin treatment called out, so treat it as a general-purpose ball bearing hinge rather than a drop-in for a non-removable pin requirement.

Ball bearings sit between the knuckles and carry the door's weight on a rolling surface instead of metal rubbing on metal. On any door with a closer, that matters: the closer has to overcome hinge friction on every cycle, and plain bearing hinges bind and squeak as they wear. The SSB4545 is a ball bearing commercial hinge, so it is the right choice for doors with closers and for openings that see steady daily use. Plain bearing hinges are fine on light residential interior doors with no closer.

No. The SSB4545 is not an ADA compliant product. Hinges themselves rarely drive ADA compliance on an opening, which is governed by opening force, clear width, and hardware operation, but if your project spec calls out ADA compliant hardware line by line, this hinge will not satisfy that line item.

Yes, and 4-1/2 by 4-1/2 square corner is the most common commercial spec to standardize on for 1-3/4 inch doors. The SSB4545 comes one way, stainless steel with a non-removable pin, so there is no finish or pin variation to track across a purchase order. Before you commit the whole building, walk the doors and confirm the mortises are square corner, not radius, and pull heavy entry doors and high-cycle openings out of the count since this one is medium duty.

It is a stainless steel butt hinge sold in a stainless steel finish, with steel listed as the product substrate. Stainless is what you want on exterior openings, pool and locker areas, kitchens, and coastal buildings where a plated steel hinge would rust at the knuckles.