Deltana DSB35R4-UT Solid Brass 3-1/2" x 3-1/2" x 1/4" Radius Hinges, Urn Tipped, (Pair)

Yes. The DSB35R4-UT is a 3-1/2 by 3-1/2 inch full mortise hinge with a 1/4 inch radius corner, so it drops into an existing 3-1/2 inch mortise routed with a 1/4 inch radius template. If your existing pocket is square-cut or chiseled to sharp corners, a radius hinge will leave a small gap at each corner unless you round the pocket. Going the other way, a radius pocket will not accept a true square corner hinge without chisel work.

No. The DSB35R4-UT is rated residential, with a plain bearing barrel rather than ball or concealed bearings, which is the right build for interior passage and bedroom doors in a house or an apartment unit. For a commercial opening or a heavy or high-cycle door, move to a bearing hinge such as the Orca Hardware 3514 Series 3.5 x 3.5 x 1/4 radius plain bearing commercial hinge or the Orca 3535 Series 4-1/2 x 4-1/2 ball bearing commercial hinge.

Think twice. The DSB35R4-UT has a standard removable pin, not a non-removable pin, so with the door closed on an out-swing exterior opening the pin can be driven out. For that situation use a non-removable pin hinge such as the Hager BB1168-NRP full mortise ball bearing hinge. On an in-swing door with the barrels inside, the removable pin is not an exposure.

The Deltana DSB35R4-UT covers 3-1/2 inch by 3-1/2 inch openings only. For 4 inch leaves with the same 1/4 inch radius corner, the Orca Hardware 4014 Series is a 4 inch by 4 inch plain bearing hinge with 1/4 inch radius corners. If the prep is square corner at 4 inch, the Orca 4040 Series is a 4 inch by 4 inch square corner plain bearing hinge, and the Delaney RH45 series is a 4 inch exterior residential pair with a 5/8 inch radius.

The Deltana DSB35R4-UT is specified for residential use. For the same 3.5 inch by 3.5 inch size with a 1/4 inch radius corner in a commercial hinge, the Orca Hardware 3514 Series plain bearing commercial hinge matches the size and corner radius and is rated medium duty.

The Deltana DSB35R4-UT is not furnished with a non-removable pin. Where an NRP hinge is required, the Hager BB1168-NRP is a full mortise ball bearing heavy duty hinge supplied with a non-removable pin.

The Deltana DSB35R4-UT is a plain bearing hinge with no electrical provision. For power transfer through the hinge, the Command Access ETH-CB70 is a 3-knuckle standard weight steel energy transfer hinge rated medium duty, the ETH-BB68 is the 5-knuckle heavy duty version, and the BEST CECB179-12C is a steel full mortise concealed bearing electrified hinge with a 12-wire quick connect. If you also need door position monitoring, the Command Access ETM-CB70 adds door position sensing.

The DSB35R4-UT ships as a pair, so two leaves. Most interior residential doors use three hinges, which means ordering two pairs per door and holding one leaf spare, or pairing it with a third matching hinge. Doors on 3-1/2 inch hinges that are light and short sometimes run two, but three is the normal residential practice.

Solid brass, both material and substrate, in a Polished Brass finish. That matters in two ways: brass will not rust in a damp bath or coastal interior the way a plated steel hinge can once the plating wears, and the color will match solid brass knobs and levers more closely than plated hardware. Comparable 3-1/2 inch residential hinges like the Emtek 91013 are plated steel instead.

For plain function on an interior residential door, plated steel equivalents in the same 3-1/2 by 3-1/2 inch square-to-radius footprint include the Emtek 91013 residential plain bearing pair, the Schlage Residential S3P1010 3.5 x 3.5 plain bearing mortise hinges sold three to a pack, or the Delaney RH35 bulk steel residential interior hinges with a 5/8 inch radius. Note the Delaney and the Schlage corner radii differ from the 1/4 inch radius on the Deltana, so match the corner to your existing pocket.

The Deltana DSB35R4-UT is a solid brass hinge with urn tips and a 1/4 inch radius corner, offered in Polished Brass. For a different decorative treatment, the McKinney SQ3331 is a square barrel 2-knuckle decorative hinge at 4-1/2 inch by 4-1/2 inch, rated standard duty. It is a larger leaf with a square barrel profile rather than a 5-knuckle urn tipped barrel.

Urn tips are decorative finials that thread or cap onto the ends of the hinge barrel, giving a turned, vase-like profile instead of a flat button tip. They are cosmetic only. The DSB35R4-UT still installs as a standard full mortise hinge in a 3-1/2 by 3-1/2 inch pocket, so the tips affect the look of the exposed barrel, not the prep.