Deltana OK2520 Olive Knuckle 2-1/2" x 2" Hinge, Solid Brass (Each)

Handing matters on this one. The OK2520 is made as a left hand and a right hand hinge, and they are not interchangeable, so you have to pick the hand that matches the door before ordering. Every finish is offered in both hands. Stand outside the door (the side you push from) and note which side the hinges are on: that is the hand you order. If you are hanging a pair of doors, you need one hand for each leaf.

At 2-1/2 x 2 inches, the OK2520 is a small hinge. That size suits cabinet doors, built-ins, jewelry and armoire doors, and light interior panel doors, not a full weight entry or commercial door. It runs a plain bearing, which is the right choice for low-frequency, light-load openings; high-traffic doors want a ball bearing hinge instead. For anything heavier, step up to a larger olive knuckle or a standard butt hinge sized to the door.

The OK2520 ships with #7 x 3/4 inch wood screws and no machine screws, so it is set up for mounting into wood door and frame stock straight out of the box. Into a hollow metal frame or anything that will not hold a 3/4 inch wood screw, you supply your own fasteners. Note the hinge is sold each, not by the pair, so order the count your door needs.

Not where the pin side is exposed. The OK2520 does not have a non-removable pin, so on an outswing exterior door the hinge pin sits on the unsecured side and can be pulled. Keep it on interior doors and cabinetry, or use a hinge with an NRP feature on any opening where security matters.

The ABH 019OK is an olive knuckle hinge built in stainless steel for commercial doors, where the Deltana OK2520 is a solid brass olive knuckle hinge sized 2-1/2 inch by 2 inch and classified for residential use. Both give the same slim barrel olive knuckle profile, so the visual look at the door edge carries over; the difference is the base metal and the commercial duty position of the ABH part. On an exterior or high traffic opening where a specifier wants stainless, the 019OK is the direct swap in the same hinge style.

Step up to the BEST BB95, a forged brass full surface olive knuckle hinge rated medium duty. The Deltana OK2520 is a solid brass olive knuckle hinge in a 2-1/2 inch by 2 inch size on a residential classification, which suits cabinet doors and light passage doors. The BB95 keeps the olive knuckle appearance while carrying a medium duty rating and a full surface mounting pattern, so it fits an opening where the leaf size and duty of the smaller brass hinge are not enough.

No. The BEST BB95 is a full surface olive knuckle hinge, meaning both leaves mount to the face of the door and frame rather than into mortises, so it does not drop into a mortised prep cut for the Deltana OK2520. The OK2520 is a 2-1/2 inch by 2 inch solid brass olive knuckle hinge supplied per piece with #7 x 3/4 inch wood screws. Swapping to the BB95 changes the mounting method at the opening, not just the part number, so plan the door and frame prep accordingly.

The olive knuckle has a single rounded, olive-shaped barrel instead of the stacked knuckles of a butt hinge, so the visible part of the hinge on a closed door is one smooth ball. It is a decorative choice, common on cabinetry and paneled interior doors where the hinge is meant to be seen. Functionally the OK2520 is a plain bearing residential hinge, so it mounts and swings a light door the same way a small butt hinge would. Where a butt hinge is usually symmetrical, olive knuckles are handed, so you order left or right.

Solid brass, substrate and all, not a plated steel hinge. That matters in a bathroom, a coastal house, or anywhere with humidity, because brass will not rust the way a plated steel hinge does once the plating wears at the knuckle. The plated and painted finishes on offer are applied over that brass body.

Only if the old hinge measured 2-1/2 x 2 inches, since the OK2520 leaves are that size and a mortise cut for a larger or smaller hinge will not line up. Check both the leaf size and the screw hole spacing on what you pull off. The hinge takes #7 x 3/4 inch wood screws, so if the old holes are worn out, plug and redrill rather than driving a longer screw into a stripped hole.

For light residential interior doors and cabinetry, yes. The OK2520 is one model in one size, 2-1/2 x 2 inches, offered across fourteen finishes and both hands, so a fleet stays consistent as long as you keep the finish and the door type constant. Where an opening in that fleet is a commercial door or sees real traffic, the OK2520 is not the hinge for it: it is a residential plain bearing hinge, and the ABH 019OK Series stainless steel commercial olive knuckle covers those doors in the same style. Remember to count by the piece, since these are sold each.

The Deltana OK2520 is a mortised hinge, cut into the door edge and jamb like a standard butt hinge. If you cannot mortise the opening, or you are hanging on a frame that will not take a routed pocket, the BEST BB95 is a full surface olive knuckle in forged brass that mounts to the face instead.

The BEST BB95 is a forged brass olive knuckle hinge specified with a removable pin. The Deltana OK2520 is a plain bearing solid brass olive knuckle hinge and is not built as a non-removable pin hinge. If the requirement is a pin that comes out on purpose for door removal during turns or maintenance, the BB95 states that removable pin construction outright.

The Deltana OK2520 is the one built around finish matching. It is a solid brass olive knuckle hinge offered in Polished Brass, Unlacquered Brass, Antique Brass, PVD Polished Brass, Polished and Brushed Nickel, Antique Nickel, Polished and Brushed Chrome, Oil Rubbed Bronze, and Paint Black, in left hand and right hand. The comparable olive knuckle hinges are positioned differently: the ABH 019OK is a stainless steel commercial hinge and the BEST BB95 is a forged brass full surface hinge, both aimed at commercial openings rather than a residential decorative finish program.

The OK2520 is not built with a non-removable pin, so nothing locks the pin in place. On a light cabinet or interior door, that also means the leaves can be separated to lift the door off. Where you want the door to stay put, specify a hinge with an NRP feature instead.

They are the same hinge style but separate manufacturer series. The Deltana OK2520 belongs to Deltana's Olive Knuckle series in solid brass, while the ABH part is from the 019OK Series in stainless steel. Order by the exact part number and series, since an olive knuckle callout on a drawing does not by itself identify which of the two is specified.