Emtek 8551 #1 Wrought Steel Single Sided Deadbolt

No. The 8551 Wrought Steel deadbolt is non-keyed and operated by a thumbturn from the inside only. There is no cylinder and no outside collar, so the exterior face of the door gets nothing. If you need key access from the outside, this is the wrong part.

It works on doors 1-3/8 inch to 2 inch thick, with the standard build set for 1-3/4 inch; specify the thickness if yours is thicker. Prep is a 2-1/8 inch cross bore with a 1 inch edge bore, which is the common tubular deadbolt prep, so it drops into an existing bored hole.

Backset is a required choice at order time, either 2-3/8 inch or 2-3/4 inch. Measure from the door edge to the center of the existing 2-1/8 inch cross bore and pick the matching one. Those are the two standard residential backsets, so an existing bored door will be one or the other.

No, and here is the distinction that trips people up: the 8551 is listed with a Schlage C keyway on the family spec, but the single sided version ships with no cylinder and no collar and is non-keyed. There is nothing to key alike. For a keyed opening on the same keyway, look at a cylinder x thumbturn deadbolt instead, such as the Hager 3115 or Hager 3215, both of which use a Schlage C keyway.

No. It is a residential product for interior use, thumbturn only, with no keyed outside trim. For a commercial exterior door look at a graded deadbolt such as the Cal-Royal CRB800 Grade 1 single cylinder or the Design Hardware D1 Series Grade 1 extra heavy duty deadbolt.

The Emtek 8551 #1 Wrought Steel deadbolt is a single sided, non-keyed deadbolt operated by thumbturn from the inside with no cylinder or collar. Two peers cover the same idea: the Callan Model 205S is a Grade 3 one-sided half-bore deadbolt, and the Arrow E60 is a Grade 2 exit deadlock, non-keyed, with a blank plate x thumbturn function for door thicknesses of 1-3/8 inch to 1-3/4 inch. The Emtek is offered in Flat Black Steel and Satin Steel finishes on a 2-3/8 inch or 2-3/4 inch backset.

The Emtek 8551 is a single sided deadbolt with no outside cylinder, so it does not key from the exterior. Keyed single cylinder peers include the Hager 3115, a Grade 2 cylinder x thumbturn deadbolt with a Schlage C keyway for 1-3/8 inch to 1-3/4 inch doors, and the Dexter DB2000-SCT, a Grade 2 single cylinder deadbolt for the same thickness range. For a Grade 1 keyed option, the Dexter DB1000-SCT covers 1-3/8 inch to 1-7/8 inch doors.

The Emtek 8551 #1 Wrought Steel deadbolt is a residential tubular deadbolt. Where a graded commercial deadbolt is required, the Accentra D111 is Grade 1 cylinder x thumbturn with a 2-3/8 inch backset and a 1-3/8 inch to 1-3/4 inch door thickness range, the Delaney LM Series is Grade 1 single cylinder less core, and the Cal-Royal CB160 is Grade 2 single cylinder with a tamper-resistant cylinder guard.

The Emtek 8551 covers 1-3/8 inch to 2 inch door thickness, standard at 1-3/4 inch, with thicker doors specified at order. Among peers with a comparable or wider range, the Deltana 7312KA2 double cylinder Grade 3 deadbolt lists 1-3/8 inch to 2 inch, and the Corbin Russwin DL3011 Grade 1 cylindrical deadlock lists 1-3/4 inch to 2-1/4 inch.

Interior openings where you want to secure a door from one side without breaking up the look of the other face: a French door slab, a closet or storage door, a den or office door, a secondary leaf on a pair. Emtek builds the 8551 for interior installation and appearance, in the Wrought Steel collection with a rustic look, and it is a residential grade product rather than a commercial one.

The Callan Model 205S is a one-sided half-bore deadbolt, which is the option when the prep does not go all the way through. The Emtek 8551 is a through-bored tubular deadbolt needing a 2-1/8 inch cross bore and a 1 inch edge bore.

The Arrow E60 exit deadlock is non-keyed with a blank plate outside and thumbturn inside, for doors 1-3/8 inch to 1-3/4 inch thick. The Emtek 8551 achieves a similar one sided operation but as a residential interior item with nothing at all on the outside face.

No. The Emtek 8551 locks and unlocks by thumbturn from the inside only, with no key cylinder on either face. Double cylinder deadbolts such as the Callan Model 210S, a Grade 3 double cylinder, the Delaney LU Series Grade 2 double cylinder, and the Dexter DB2000-DCT Grade 2 double cylinder for 1-3/8 inch to 1-3/4 inch doors require a key on both sides, which changes egress behavior at the opening.

The Emtek 8551 uses a #1 Wrought Steel thumbturn in Flat Black Steel or Satin Steel. The Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn for 1-3/8 inch to 1-3/4 inch doors; unlike the 8551 it also carries an outside key cylinder.

No. The Emtek 8551 is a tubular deadbolt that fits a 2-1/8 inch cross bore and 1 inch edge bore with a 2-3/8 inch or 2-3/4 inch backset, so it installs in standard bored door prep. The Codelocks CL200 is a surface deadbolt with key override, and the Codelocks CL2200 is an electronic surface deadbolt in brushed steel; both mount to the door face rather than into a bored prep, and the Dormakaba Nova-D is an RFID electronic deadbolt for multihousing.

Two: Flat Black Steel (FBS), ordered as 8551FBS, and Satin Steel (SWS), ordered as 8551SWS. Both are the Wrought Steel look, so they match the rest of the Emtek Wrought Steel #1 trim on the same opening.

Purely mechanical. It is a non-electronic tubular deadbolt turned by hand from the inside, so no power, no wiring, no batteries. If you want keypad or credential access, that is a different product family such as the Delaney KP400 electronic deadbolt or the Codelocks CL2210 electronic mortise deadbolt.