Adams Rite MS1851SN - Series MS® Deadlock (ANSI Size 8" body), Radius Faceplate, any Handing, Stainless Steel Straight Bolt

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9.00 (in)

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Adams Rite MS1851SN Series MS® Deadlock (ANSI Size), Radius Faceplate, any Handing

The ANSI size MS1851SN Series MS® Deadlock w/ Radius Faceplate utilizes a laminated stainless steel bolt and is activated by a pivot mechanism to provide maximum security for hollow metal or wood doors.


For hollow metal or wood doors prepared for hardware according to the specifications of the American National Standards Institute (ANSI), the MS1851SN ANSI Lock provides maximum security and ease of installation. Its standard 1-1/2” [38.1 mm] backset dimension provides adequate clearance for the deep stop on the door jamb of hollow metal entrances.


360° turn of key or thumbturn projects or retracts the counterbalanced bolt. Key can be removed only when bolt is in a positively locked or unlocked position. Lock accepts any standard 1" [25.4 mm] length, 1-5/32" [29.4 mm] diameter mortise cylinder with MS® cam such as the 4036 Mortise Cylinder, available separately or thumbturn such as the 4066 Thumbturn, available separately. Lock accepts cylinder from either or both sides.



The MS1851SN ANSI lock is available with a backset size of 1-1/2” [38.1 mm] only.


Measures 1” x 6” x 2-1/4” [25.4 mm x 152.4 mm x 57.2 mm]. Steel with corrosion-resistant plating.


Eight-ply laminated stainless steel. Center ply has alumina-ceramic core to defeat any hacksaw attack, including rod-type “super” hacksaws.

Standard straight bolt measures 5/8" x 1-3/8" x 2-7/8" [15.9 mm x 34.9 mm x 73.0 mm] with 1-3/8" [34.9 mm] throw. 


The faceplate of the MS1851SN ANSI lock measures 1-1/4” x 8” [31.8 mm x 203.2 mm].


See below for dimensions of strike slot which can be cut in metal jamb. Lipped, ANSI-spec, and other strike plates available separately.


Click here for our Definitive List of Door Hardware Finishes

Standard Package

Individually boxed with faceplate and mounting screws. Strike plates, cylinders and/or thumbturns available separately.

Shipping Weight

1-1/2 lbs [0.68 kg].


“SCHOOLHOUSE” version for the MS1851SN ANSI lock is also available and is modified so that operation from inside is “unlock only”. This lock is handed and must be specified LH or RH. Specify SCH1851SN Series. Same faceplate and backset options as MS1851SN Series.

Adams Rite MS1850SN Ansi Lock Backset Measurement | Adams Rite MS1851SN Deadlock Backset Measurement

Adams Rite MS1850SN Ansi Lock Dimensions | Adams Rite MS1851SN Deadlock Dimensions



Click here to download Adams Rite MS1851SN Catalog
Click here to download Adams Rite MS1851SN Installation Instructions
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