International Door Closers DH-1821 Hook Bolt Deadlock with Flat Faceplate

Cylinder backset has to be specified on the order. The DH-1821 is offered in 31/32 inch and 1-1/8 inch backsets. The DH-1820-H hook bolt is also built in 1-1/2 inch backset. Measure from the face of the stile to the center of the cylinder hole on the door you are working on before you pick.

It accepts a standard 1-5/32 inch mortise key cylinder or thumbturn cylinder with an Adams Rite MS-type cam. No cylinder is part of the lock itself, so order the cylinder in your keyway separately and confirm the cam is MS-type, not a standard mortise cam.

The DH-1821 uses a hook bolt with a 1-3/16 inch throw made of 5-ply laminated steel with a hardened roller pin in a case hardened center ply, a geometry that hooks into the strike rather than driving straight. A straight-throw commercial comparison is the Hager 3215 single cylinder deadbolt with a 1 inch throw, Grade 2, for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal CRB800 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch.

The DH-1821 is a hook bolt deadlock built around MS-type mortise cylinder prep with a flat faceplate measuring 1 inch by 6-7/8 inches, which is the narrow-stile pattern. The nearest mortise-case alternative is the Dormakaba D900 small case mortise deadbolt, a cylinder x thumbturn mortise deadbolt. Emtek's 2050 and 2051 European mortise deadbolts are also mortise-cased cylinder x thumbturn units, though they carry an integrated roller latch, the 2050 with square trim and the 2051 with round.

The DH-1821 is a mortise hook bolt deadlock with cylinder backsets of 31/32 inch and 1-1/8 inch, dimensions suited to narrow stile work rather than a standard wood or hollow metal door. For a 1-3/4 inch door, the Corbin Russwin DL3211 is a Grade 1 cylindrical deadlock in a cylinder x blank configuration rated for 1-3/4 inch doors, and the DL3011 covers 1-3/4 inch to 2-1/4 inch. The Design Hardware D1 Series is a Grade 1 extra heavy duty double cylinder deadbolt for 1-3/4 inch doors.

1-3/16 inch throw. The bolt is 5-ply laminated steel with a hardened roller pin in a case hardened center ply, so a saw blade skates on the pin rather than cutting through. Make sure your strike or keeper pocket is deep enough to take the full 1-3/16 inch of hook.

Flat faceplate measuring 1 x 6-7/8 inches. If the existing lock in the stile was prepped for a beveled or a longer plate, the pocket cut will not match and you will see the old mortise. Check the existing cutout against the 1 x 6-7/8 inch footprint before you swap.

Within the DH-1820 Series, the -H is the hook bolt version and the -S is the short throw version. The hook bolt comes in 31/32, 1-1/8 and 1-1/2 inch cylinder backsets; the short throw is built in 1-1/8 inch backset only. Pick the hook when the opening can be spread or the leaf slides; the short throw for tighter pocket conditions.

Not practically. The DH-1821 is a mortise hook bolt made for narrow stile openings and takes a 1-5/32 inch mortise cylinder with an MS-type cam, which is a different prep and a different cylinder from what a bored door uses. For the wood and hollow metal leaves, a cylindrical deadlock family like the Corbin Russwin DL3000 Series, rated for 1-3/4 to 2-1/4 inch doors, keeps you on one prep. You can still key everything alike by ordering matched keyways across both.

Residential-style tubular deadbolts share the deadbolt name but not the DH-1821's mortise hook bolt construction or MS-type cylinder prep. The Bravura 310B Elite, 310RC Elite and 310SC Elite are Grade 2 round and square trim deadbolts in cylinder x thumbturn, and the Brinks Raleigh E2401 and Mendocino E2402 use a 4-way adjustable tubular backset. The Baldwin Estate 8011 and Emtek #11 Tuscany cast bronze deadbolt are decorative trim deadbolts. None of these are mortise cases with a 1 inch by 6-7/8 inch flat faceplate.

The DH-1821 takes standard 1-5/32 inch mortise key or thumbturn cylinders with an MS-type cam, so the inside function depends on which cylinder you order with it. If you want a factory non-keyed exit function, the Arrow E60 is a Grade 2 exit deadlock, non-keyed, with a blank plate by thumbturn function for 1-3/8 inch to 1-3/4 inch doors. For a keyed outside and blank inside, the Corbin Russwin DL2211 is a Grade 1 cylindrical deadlock in cylinder x blank for 1-3/4 inch doors.

The DH-1821 is built for standard 1-5/32 inch mortise key or thumbturn cylinders with an AR MS-type cam. If your facility keys on SFIC, the Arrow E61 is a Grade 2 single cylinder deadlock supplied with SFIC prep less core for 1-3/8 inch to 1-3/4 inch doors, and the Deltana CL200LAIC is a Grade 2 single deadbolt with interchangeable core prep on a 2-3/4 inch backset. The Delaney LM Series is a Grade 1 single cylinder less core deadbolt.

The DH-1821 is a mechanical, non-electronic deadlock. For an electrified mortise deadbolt, the DynaLock 1300 Series is a heavy duty mortise electric deadbolt, and the Codelocks CL2210 is an electronic mortise deadbolt. If a surface-applied electronic unit suits the door better, the Codelocks CL2200 is a medium duty electronic surface deadbolt in a brushed steel finish.

The DH-1821 is a commercial hook bolt deadlock ordered by cylinder backset rather than by ANSI function code. Where a graded classroom deadbolt is required, the Falcon D111 is a Grade 1 heavy duty classroom deadbolt with adjustable backset, the Hager 3118 is a Grade 1 classroom deadbolt with Schlage C keyway and 6-pin cylinder for 1-3/8 inch to 1-3/4 inch doors, and the Accentra D111 is a Grade 1 cylinder x thumbturn deadbolt with 2-3/8 inch backset for 1-3/8 inch to 1-3/4 inch doors.

The DH-1821 accepts standard 1-5/32 inch mortise key or thumbturn cylinders with an MS-type cam, so keying both sides depends on the cylinders ordered. Purpose-built double cylinder deadbolts include the Design Hardware D1 Series, Grade 1 extra heavy duty for 1-3/4 inch doors; the Dexter DB1000, Grade 1 for 1-3/8 inch to 1-7/8 inch doors; and the Hager 3214, Grade 2 with Schlage C keyway for 1-3/8 inch to 1-3/4 inch doors.

Two: anodized satin aluminum, and an anodized satin aluminum with anodized bronze finish combination. Both are offered in either the 31/32 inch or 1-1/8 inch backset, so you can match existing storefront hardware in clear or dark bronze anodized without changing backset.

No, it is purely mechanical, key and turn operated. If the opening needs credential or code access, look at an electrified deadbolt instead, such as the DynaLock 1300 Series mortise electric deadbolt or the Codelocks CL2210 electronic mortise deadbolt.

The DH-1821 is a commercial mortise hook bolt deadlock with a 5-ply laminated steel bolt. For lighter service, the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with adjustable backset for 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn across the same door thickness range. The Callan 200S is a Grade 3 single cylinder square trim deadbolt.