Deltana S35R4HD 3-1/2" x 3-1/2" x 1/4" Radius Hinge, Heavy-Duty, Steel (Pair)

The S35R4HD is cut with 1/4 inch radius corners, so it drops into a mortise routed by a standard hinge template with rounded corners. If your existing frame and door are prepped square, or with the wider 5/8 inch radius common on residential doors, the pocket won't match. Measure the corner of the existing mortise before ordering: a 5/8 inch radius pocket leaves a visible gap around a 1/4 inch radius leaf, and a square pocket needs corners chiseled or a square corner hinge instead.

Plain bearing. The leaves ride knuckle on knuckle with no bearing races, which is fine for interior doors opened by hand. Put a door closer on the opening, or hang a heavy solid core or exterior door, and the load runs on plain knuckles all day and they wear and squeak sooner. That is the point to move to a ball bearing hinge, such as the Emtek 94013 heavy duty ball bearing hinge in the same 3-1/2 by 3-1/2 size, or the Orca 3535 Series ball bearing commercial hinge in 4-1/2 by 4-1/2.

Not on an outswing exterior door. The S35R4HD does not have a non-removable pin, so when the door swings out the hinge knuckles sit on the outside and the pin can be driven out. For an outswing opening, specify an NRP hinge such as the Hager BB1168 non-removable pin full mortise ball bearing hinge. On an inswing door the knuckles are on the secure side and this is not an issue.

Full mortise mounting, which means one leaf mortises into the door edge and the other into the jamb, the standard prep on hung wood doors. A direct swap works when the old hinge is also 3-1/2 by 3-1/2 with 1/4 inch radius corners. Coming off a 4 by 4 hinge, the pocket is too big and the screw holes won't line up, so you would need a 4 by 4 replacement instead.

For interior unit doors, yes. It's a steel residential hinge in the most common apartment door size, 3-1/2 by 3-1/2, with 1/4 inch radius corners that match the factory prep on most prehung wood doors, and it ships by the pair so you can buy to the door count. Two cautions for a fleet spec: it's plain bearing, so any door with a closer on it should get a ball bearing hinge instead, and there's no NRP option, so outswing exterior doors need a different hinge. If you want bulk residential in the same size, the Delaney RH35 series is a 3-1/2 by 3-1/2 bulk interior hinge, though at a 5/8 inch corner radius.

No. The S35R4HD is a plain bearing steel hinge classified for residential use, and heavy-duty in that context refers to the .119 leaf thickness rather than a commercial bearing rating. Where a spec calls for a commercial bearing hinge, the Ives 3CB1 is a steel 3-knuckle concealed bearing full mortise hinge at medium duty, the Orca 3535 Series is a 4-1/2 inch x 4-1/2 inch square corner ball bearing commercial hinge, and the Delaney CH401X is a 4 inch x 4 inch commercial ball bearing hinge with square corners. All three change the mortise size or corner cut relative to the 3-1/2 inch radius prep the Deltana fits.

The Orca Hardware 3514 Series is the nearest match: a 3.5 inch x 3.5 inch x 1/4 inch radius corner plain bearing hinge, the same size, same 1/4 inch radius corner and same plain bearing arrangement as the Deltana S35R4HD. Both drop into an existing 3-1/2 inch mortise with 1/4 inch radius routing, so no door or jamb rework is needed to swap one for the other. The Deltana is sold as a pair in steel; the Orca 3514 is rated medium duty.

The S35R4HD is cut with 1/4 inch radius corners and will leave a gap in a square-corner mortise. For square-corner prep at the same 3-1/2 inch x 3-1/2 inch size, the Emtek 92013 is a heavy duty plain bearing hinge in plated steel sold as a pair with square corners, matching the S35R4HD's plain bearing action. The Emtek 91013 is the residential-duty version of the same square-corner size, and the Schlage Residential S3P1010 is a 3.5 inch x 3.5 inch square corner plain bearing mortise hinge sold three to a pack, which suits a three-hinge door in one order.

The S35R4HD uses a plain bearing, which relies on metal-to-metal knuckle contact. On openings that cycle heavily, a bearing hinge carries the load on rolling elements instead. At the same 3-1/2 inch x 3-1/2 inch size, the Emtek 94013 is a heavy duty ball bearing hinge in plated steel sold as a pair, though it is cut with square corners rather than the 1/4 inch radius the Deltana uses. For a wider commercial leaf, the Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with 3 knuckles, and the Don-Jo HWBB84545 is a heavy weight full mortise ball bearing hinge at 4-1/2 inch x 4-1/2 inch, both of which need a larger mortise than the 3-1/2 inch prep.

The S35R4HD is not built with a non-removable pin. For an out-swinging door where the pin is reachable from the exterior, the Hager BB1168 is a non-removable pin full mortise ball bearing heavy duty hinge. It is a ball bearing hinge rather than the plain bearing arrangement the Deltana uses, so confirm the leaf size against your existing mortise before ordering.

No. The S35R4HD is a plain bearing steel full mortise hinge with no wiring path through the knuckle. Power transfer through the hinge requires a purpose-built unit: the Command Access ETH-CB70 is a 3 knuckle standard weight steel base energy transfer hinge at medium duty, the ETH-BB68 is the 5 knuckle heavy duty version, and the ETM-CB70 adds door position sensing for monitoring. The BEST CECB179-12C is a steel full mortise concealed bearing electrified hinge with a 12-wire quick connect. All of these replace one hinge in the opening and require a wire path in the frame the S35R4HD does not need.

Each leaf measures 3-1/2 by 3-1/2 inches, and the S35R4HD is sold by the pair. A standard interior door usually hangs on three hinges, so a single door takes two packs with a spare leaf, or plan on ordering by the pair count you actually need for the opening rather than by the door.

Wood screws are specified at #10 by 1 inch, sized for a wood door and wood jamb. Into a hollow metal frame or a steel-reinforced jamb you'll need machine screws instead, which are a separate item.

Eight finishes: Oil Rubbed Bronze, Oil Rubbed Bronze (US10B-C), Brushed Nickel, Antique Nickel, Polished Chrome, Brushed Chrome, Polished Brass, and Antique Brass. Note the two oil rubbed bronze options are not the same thing, so if you are matching hinges already hanging on other doors in the building, pin down which of the two you have before ordering the rest.

No handing to specify. It's a symmetrical full mortise butt hinge, so the same pair works on a left hand or right hand door. Order by size, corner radius, and finish only.

Leaf gauge. The R4HD is the heavy-duty build of the Deltana S35 steel line at .119 inch thick, so it carries a heavier solid core door than a thinner standard residential leaf of the same 3-1/2 by 3-1/2 size. Within the same size class, Emtek splits its line the same way: the 91013 is the residential duty plain bearing hinge and the 92013 is the heavy duty plain bearing version, both 3-1/2 by 3-1/2, though those are square corner rather than radius.

Both are heavy duty hinges at 3-1/2 inch x 3-1/2 inch sold as a pair. The difference is at the corners and the bearing: the S35R4HD is cut with 1/4 inch radius corners and uses a plain bearing in steel, while the Emtek 96213 is cut with square corners. The corner cut decides which one your existing routing accepts. The S35R4HD also comes in eight finishes including oil rubbed bronze, brushed nickel, antique nickel, polished chrome, brushed chrome, polished brass and antique brass, so there is usually a match to the levers and pulls already on the doors.

No. The S35R4HD is a residential-classification steel hinge with a removable pin. Detention openings use purpose-built hardware: the BEST BB855 is a heavy-duty steel double weight concealed ball bearing prison hinge, and the Stanley BB855 is a double weight prison hinge at 5 inch by 6 inch furnished with no holes and not swaged, meaning it is drilled and prepped to the frame on site.

Steel, both the base material and the substrate, with the finish plated over it. That's why it's a value option next to a solid brass hinge, and it's also why it's specified for indoor use. On a coastal or high-humidity exterior opening, a plated steel hinge is the wrong call and a non-ferrous hinge such as the McKinney T2314 is the direction to go.