International Door Closers DT-1851 Long Throw Deadlatch Lock with Flat Faceplate

The DT-1851 accepts a standard 1-5/32 inch mortise key cylinder or thumbturn cylinder with an AR MS-type cam. That is the same cylinder family used on aluminum storefront MS-style hookbolt locks, so a shop that already stocks MS cams can key this in without a special order. The cylinder is not part of the lock body, so specify it separately along with the backset.

Three cylinder backsets are offered in the DT-1850 series: 31/32 inch, 1-1/8 inch, and 1-1/2 inch. Backset must be specified when ordering because it sets where the cylinder centers relative to the faceplate and has to match the existing cylinder hole in the stile. Measure from the door edge to the center of the cylinder hole on the door you are working on.

Flat faceplate, measuring 1 x 6-7/8 inches. Flat is the right choice for a square-edge aluminum or hollow metal door edge; a curved or radius faceplate is used where the door edge itself is beveled or rounded. If you are swapping an existing lock, compare the old faceplate footprint to that 1 x 6-7/8 inch cutout before you order.

The DT-1851 is a mortise-style long throw deadlock aimed at narrow aluminum stile doors, where the cylinder backset is under 1-1/2 inches and there is no room for a 2-3/8 or 2-3/4 inch bored deadbolt. On a wood or hollow metal door with a normal 2-3/8 or 2-3/4 inch backset bore, a bored deadbolt is the easier install: the Hager 3215 single cylinder or the Accentra D111 Grade 1 with a 2-3/8 inch backset are that type.

The DT-1851 is built for narrow stile work: it takes a 1-5/32 inch mortise key or thumbturn cylinder with an MS-type cam and is offered in 31/32 inch and 1-1/8 inch cylinder backsets, with a 1-3/8 inch long throw bolt. The nearest equivalent in a mortise dead bolt case is the Dormakaba D900 small case mortise dead bolt, which is also a cylinder x thumbturn mortise dead bolt and is supplied keyed different with SC keyways. Note the D900 is a small case mortise bolt rather than a narrow stile long throw bolt, so confirm the stile width and cylinder backset before you swap.

The DT-1851 is a mortise long throw deadlock sized for narrow stile cylinder backsets of 31/32 inch and 1-1/8 inch. For a 1-3/4 inch hollow metal door, a cylindrical deadlock is the better match: the Corbin Russwin DL3211 is a Grade 1 cylindrical deadlock in cylinder x blank function for 1-3/4 inch doors, and the DL3011 covers 1-3/4 inch through 2-1/4 inch doors in the same cylinder x blank arrangement. The Arrow E61 in SFIC prep less core is another keyed deadlock option covering 1-3/8 inch to 1-3/4 inch doors if you key to a small format interchangeable core system.

The bolt is built from 5-ply laminated steel with a hardened roller pin set in a case hardened center ply. The roller pin spins against a saw blade instead of letting it bite, which is the standard anti-saw construction on a security deadlock. It is rated for commercial use.

It is a mechanical lock with no electronic component. Key or thumbturn operation only, through the mortise cylinder you specify. If the opening needs remote release or access control, a mortise electric deadbolt such as the DynaLock 1300 Series is the type to look at instead, and Codelocks CL2210 covers keypad mortise deadbolt duty.

Use a lock with a published fire rating for that opening instead. Among commercial deadbolts we carry, the Hager 3215 and Hager 3115 are listed as fire rated and fit 1-3/8 to 1-3/4 inch doors; the Cal-Royal CRB800 is a heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch. Match the rating to what the door assembly requires.

Yes. The lock body accepts either a key cylinder or a thumbturn cylinder in the 1-5/32 inch mortise size with an AR MS-type cam, so a key outside and thumbturn inside is a matter of which two cylinders you order. Nothing about the lock case changes. Note that where an egress door needs no key on the inside at all, a blank plate x thumbturn exit deadlock such as the Arrow E60 is the function to look at.

Both are mortise dead bolts, but they solve different openings. The DT-1851 is a long throw deadlock with a 1-3/8 inch bolt of 5 ply laminated steel with a hardened roller pin, a flat faceplate of 1 inch by 6-7/8 inch, and it accepts a 1-5/32 inch mortise cylinder with an MS-type cam. The Emtek 2050 is a European mortise deadbolt with an integrated roller latch in a square trim style, operating cylinder x thumbturn. The Emtek uses a euro profile case with a roller latch to hold the door closed, while the DT-1851 is a dead bolt only.

The DT-1851 accepts a mortise key or thumbturn cylinder, so it is configured by the cylinder you specify rather than sold as a fixed exit function. If you want a dedicated non-keyed exit dead lock, the Arrow E60 is a Grade 2 exit deadlock in blank plate x thumbturn function for doors 1-3/8 inch to 1-3/4 inch thick - blank on the outside, thumbturn on the inside, no key.

The DT-1851 is a mechanical lock with no electronic option; it is operated by a mortise key or thumbturn cylinder. If you want code or credential access instead, the Codelocks CL2210 is an electronic mortise deadbolt, and the Codelocks CL2200 is a medium duty electronic surface deadbolt in a brushed steel finish. For a mechanical pushbutton in a mortise case, the Codelocks CL200 is a surface deadbolt with key override.

The DT-1851 is a commercial long throw mortise deadlock with a 1-3/8 inch bolt of 5 ply laminated steel and a hardened roller pin in a case hardened center ply. If your specification calls out an ANSI Grade 1 dead bolt by grade, peers that carry that rating include the Accentra D111 single cylinder deadbolt with a 2-3/8 inch backset for 1-3/8 inch to 1-3/4 inch doors, the Falcon D111 Grade 1 classroom deadbolt with adjustable backset, and the Design Hardware D1 Series Grade 1 double cylinder deadbolt for 1-3/4 inch doors.

The Arrow 460 is a mortise lock strike for latchbolt by deadbolt functions with a straight lip, sized for 1-3/4 inch doors, so it is intended for a conventional mortise lock body rather than a narrow stile long throw deadlock. The DT-1851 throws a 1-3/8 inch bolt behind a flat faceplate measuring 1 inch by 6-7/8 inch, which needs a strike with the depth to receive that throw in the jamb or adjacent stile. Confirm the strike against the 1-3/8 inch throw before ordering the 460 for it.

The DT-1851 accepts standard 1-5/32 inch mortise key or thumbturn cylinders with an AR MS-type cam, so the outside and inside trim is determined by which cylinders you specify. If you want a factory double cylinder unit in a bored prep, peers include the Hager 3214 Grade 2 double cylinder deadbolt with Schlage C keyway for 1-3/8 inch to 1-3/4 inch doors, the Dexter DB1000 Grade 1 double cylinder for 1-3/8 inch to 1-7/8 inch doors, and the Design Hardware D1 Series Grade 1 double cylinder for 1-3/4 inch doors. Double cylinder use is restricted on egress doors in many jurisdictions, so check your local code first.

One finish combination is offered: anodized satin aluminum with anodized bronze. Those are the two standard storefront anodize colors, so the lock can be matched to either a clear or dark bronze aluminum door frame across a building without ordering two different parts.

The DT-1851 is a commercial long throw deadlock with a 5 ply laminated steel bolt and a hardened roller pin, built for security on exterior narrow stile openings. For lower traffic bored applications, Grade 3 options include the Cal-Royal ED500 single cylinder deadbolt with adjustable backset for 1-3/8 inch to 1-3/4 inch doors and the Cal-Royal LSD with an ADA ergonomic thumbturn over the same door thickness range. In Grade 2, the Cal-Royal CB160 adds a tamper-resistant cylinder guard in cylinder x thumbturn function.