Deltana S41/4058TTN 4" x 4-1/4" x 5/8" Radius x Square Hinge, NRP, Steel (Pair)

That is exactly what the S41/4058TTN is built for. It's a special hinge for fiberglass doors, 4 x 4-1/4 inches, with 5/8 inch radius corners on one leaf and square corners on the other. Fiberglass slabs are commonly routed with a radius corner mortise in the door and a square corner prep in the frame, and this hinge carries both so it drops into that prep without re-routing. If both your door and frame preps are square, or both radius, you need a matched-corner hinge instead.

NRP is a non-removable pin, and this hinge has one. A set screw in the barrel seats against the pin so it can't be tapped out with the door closed. That matters on any out-swing exterior door, because the hinge barrels sit on the outside where someone can reach them. On an in-swing door NRP does nothing for you but does no harm. Locksmiths and property managers upgrading out-swing service or unit entry doors are the usual buyers here.

Plain bearing, steel, 0.092 inch gauge, and rated residential. Plain bearing means the knuckles ride directly on each other with no bearing races, which is fine for a house or a single-family unit door that cycles a few dozen times a day. It is not the right choice for a commercial entrance, a corridor door, or anything with a closer on it, where the knuckles will wear and the door will start to sag. For that traffic, step up to a ball bearing hinge such as the Orca Hardware 3535 Series 4-1/2 x 4-1/2 square corner ball bearing commercial hinge, or a heavy duty Don-Jo HWBB74545 in 4-1/2 x 4-1/2.

It matches only if the existing hinge is 4 x 4-1/4 with one radius corner leaf and one square corner leaf. Pull one hinge, lay it flat and measure leaf to leaf across the open pair, then look at the corners. Fiberglass slabs from several manufacturers use this radius-and-square combination, which is why it exists as a separate part. If the units instead have plain 4 x 4 square corner hinges, the Orca 4040 Series 4 x 4 square corner plain bearing hinge is the size match; for 3-1/2 x 3-1/2 square corner openings, the Schlage Residential S3P1010 comes three to a pack, which suits a door at a time.

The Deltana S41/4058TTN is a non-removable pin hinge in steel, rated residential with a plain bearing. That covers the security concern on a light out-swinging door. For a heavier or higher-traffic out-swinging opening, the Hager BB1168 is a non-removable pin full mortise ball bearing hinge at a heavy duty level, in the BB1168 series - same NRP protection, ball bearing instead of plain, and a heavy duty rating. Both address the same exposed-pin problem; the choice comes down to door weight and cycle count.

The S41/4058TTN is sold as a pair, so one order gets you two hinges. Most residential entry doors hang on three hinges, so plan on two orders per opening (you'll have one spare). Taller or heavier slabs sometimes carry four. Count the existing mortises in the frame before ordering rather than assuming three.

Two: brushed nickel and prime coat white. Prime coat white is the one to take if the door and jamb are getting painted, since it's meant to be finish-painted along with the trim. Brushed nickel is the one to match to existing satin nickel lever sets and deadbolts on the same opening.

Full mortise, yes. One leaf mortises into the door edge and the other into the jamb, so both sides need a routed pocket at the leaf thickness. On a replacement job the existing pockets are already there, which is why matching the 4 x 4-1/4 size and the 5/8 inch radius by square corner pattern matters more than anything else on this hinge. New construction means routing both. If your frame is set up for a surface-applied or half mortise hinge, this isn't the one.

No. The Deltana S41/4058TTN is a plain bearing steel hinge with a non-removable pin and no wire path through the leaves. For power transfer you need a purpose-built hinge: the Command Access ETH-CB70 is an energy transfer hinge with a 3 knuckle standard weight steel base, medium duty, in the ETH 3 series; the ETH-BB68 is the 5 knuckle heavy duty version in the ETH 5 series. If you also need door position sensing, the Command Access ETM-CB70 adds door position sensing on a 3 knuckle steel base at medium duty. The Deltana can still hang the remaining leaves on the same door - only one hinge on the opening normally carries the transfer.

The Deltana S41/4058TTN is rated residential with a plain bearing, which fits unit and interior doors. Corridor and other high-cycle openings are usually better served by a commercial-rated hinge. Within the same 4 inch nominal height, the Orca Hardware COM4040 is a 4 inch x 4 inch square corner plain bearing commercial hinge at medium duty, and the Orca COM4014 is a 4 inch x 4 inch hinge with 1/4 inch radius corners, also plain bearing and medium duty. The Delaney CH401X is a 4 inch x 4 inch commercial ball bearing hinge with square corners from the Ball Bearing Hinge series if you want bearings on the heavier-traffic leaves. All three are 4 inch nominal, so leaf height stays consistent across the building even where the duty rating steps up - but confirm corner style and leaf width against each existing prep.

Not on the same door prep. The Emtek 91013 is a residential plain bearing hinge pair in plated steel, from the Residential Duty Hinges series, and it shares the plain bearing and residential positioning of the Deltana S41/4058TTN. But the Emtek is 3-1/2 inch x 3-1/2 inch with square corners, while the Deltana is 4 inch x 4-1/4 inch with 5/8 inch radius x square corners. That is a different leaf height, a different leaf width, and a different corner cut - three separate reasons the mortise will not line up. Use the Emtek 91013 when you are hanging on a 3-1/2 inch square corner prep, not when replacing a 4 inch x 4-1/4 inch radius hinge.

The Deltana S41/4058TTN carries a non-removable pin, which is there for out-swinging doors where the pin is reachable from outside. On an in-swinging interior door that feature does nothing for you. The Delaney RH45xx is a 4 inch x 4 inch bulk residential hinge pair with 5/8 inch radius corners from the Exterior Residential Hinges series, and the Delaney RH40xx is a 4 inch x 4 inch residential pair with 5/8 inch radius x square corners. Both keep the 4 inch nominal height and the 5/8 inch radius corner the Deltana uses. Check leaf width before you commit - the Deltana is 4 inch x 4-1/4 inch, wider than a 4 x 4.

The Deltana S41/4058TTN is a residential-rated steel hinge with a plain bearing, 4 inch x 4-1/4 inch, non-removable pin. The Don-Jo HWBB74545 is a heavy weight full mortise ball bearing hinge, 4-1/2 inch x 4-1/2 inch in satin chrome, at a heavy duty level. Three things change: bearing type (plain versus ball), duty level, and size - the Don-Jo needs a 4-1/2 inch square mortise, half an inch taller than the Deltana. Don-Jo also lists the HWBB75045 at 5 inch x 4-1/2 inch, heavy duty, for wider or heavier leaves. If the frame is already prepped 4 inch x 4-1/4 inch, none of the Don-Jo heavy weight hinges will drop in without reworking the mortise.

All three are steel plain bearing residential hinges. The Ives 1010RP has square corners, is medium duty, and comes as a set of 3 in the 1000 series; the Schlage Residential S3P1010 is 3.5 inch x 3.5 inch square corner plain bearing mortise, medium duty, 1000 series, packed 3. The Deltana S41/4058TTN is 4 inch x 4-1/4 inch with 5/8 inch radius x square corners, non-removable pin, and is sold as a pair. Two practical differences: the Deltana's non-removable pin, which neither of the others carries, and the pack quantity - a three-hinge door takes two Deltana orders or one pack from the others. Corner style and size decide it: the Schlage and Ives are square corner 3.5 inch preps, the Deltana is a 4 inch x 4-1/4 inch radius-and-square prep.