Adams Rite MS1851SN-45X - Series MS® Deadlock (ANSI Size 8" body), Radius Faceplate, any Handing, Stainless Steel Hookbolt

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3.00 LBS
Width x Height x Depth:
2.00 (in)


3.00 (in)


9.00 (in)

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Adams Rite MS1851SN-45X Series MS® Deadlock (ANSI Size), Radius Faceplate, any Handing, 1-1/2" Door Backset

The ANSI size MS1851SN-45X Series MS Deadlock w/ Radius Faceplate utilizes a stainless steel hookbolt, and is activated by a pivot mechanism to provide maximum security for hollow metal or wood doors.


The ANSI size MS1851SN-45X Series MS® Deadlock provides maximum security and ease of installation for hollow metal or wood sliding doors. Its standard door backset dimension of 1-1/2” [38.1 mm] provides adequate clearance for the deep jamb “pocket” of many commercial and industrial entrances. The locking mechanism is identical to the widely used MS1850SN Series MS Deadlock, except that the massive laminated bolt is provided in a hook shape to resist the parting motion of sliding door and jamb. The over-center maximum security (MS) locking action assures that forced entry attempts to pry the door in any direction, up, down, or sideways will be defeated. Also useful for swinging doors closing against jambs too shallow for the 1-3/8” [34.9 mm] throw of the MS1850SN Series MS® Deadlock.


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.


Door Backset

The MS1851SN-45X Deadlock is available in a door 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.

Hookbolt measures 5/8" x 1-3/8" [15.9 mm x 34.9 mm] with 13/16" [20.6 mm] throw. Hook shape repels pry bar attempts to “spread” the door from its jamb or lift it off its track.


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, also available, is modified so that operation from inside is “unlock only”. This lock is handed and must be specified LH or RH. Specify SCH1851SN-450 Series. Same faceplate and backset options as MS1851SN-450 Series.

Adams Rite MS1851SN-45X Deadlock Door Backset Measurement


Adams Rite MS1851SN-45X Deadlock Door (w/ 1-1/2 Door Backset) Dimensions

Adams Rite MS1851SN-45X Deadlock Door (w/ 1-1/2 Door Backset) Lock and Cylinder Installation


Click here to download Adams Rite MS1851SN-45X Catalog
Click here to download Adams Rite MS1851SN-45X Installation Instructions
Click here to download Adams Rite Price List