Adams Rite MS1851S-X5X - Series MS® Deadlock, Radius Faceplate, 6-7/8" body, 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 MS1851S-X5X Series MS® Deadlock, Radius Faceplate, any Handing

The MS1851S-X5X Series MS® Deadlock w/ Radius Faceplate utilizes a laminated stainless steel hookbolt to provide maximum security for a sliding narrow stile aluminum door. This Adams Rite Deadlock is activated by a pivot mechanism.


The MS1851S-X5X Series Adams Rite Deadlock answers the security need of sliding narrow stile aluminum doors in commercial, industrial, and institutional buildings. The locking mechanism is identical to the Adams Rite MS1850S 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.


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 or thumbturn such as the 4066 Thumbturn, available separately. Lock accepts cylinder from either or both sides.



The MS1851S-X5X Adams Rite Deadlock is available in four different backset sizes: 7/8" [22.2 mm], 31/32" [24.6 mm], 1-1/8" [28.6 mm], and 1-1/2" [38.1 mm].


Measures 1" x 6" x depth [25.4 mm x 152.4 mm x depth], depth varies by backset (see table below). Steel with corrosion-resistant plating.


Measures 1" x 6-7/8" [25.4 mm x 174.6 mm].


See below for dimensions of strike slot which can be cut in metal jamb. Trim plate, box strike, and armored strike are available separately.


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 shaped bolt repels pry bar attempts to “spread” the door from its jamb or lift it off its track.


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 is also available for the MS1851S-X5X Adams Rite Deadlock and is modified so that operation from inside is “unlock only”. This lock is handed and must be specified LH or RH. Specify SCH1851S-X5X Series. Same faceplate and backset options as MS1851S-X5X Series.

Adams Rite MS1851S-X5X Deadlock Backset Measurement | Adams Rite Deadlock

Adams Rite MS1851S-X5X Deadlock Dimensions | Adams Rite Deadlock

Adams Rite MS1851S-X5X Deadlock Stile Preparation | Adams Rite Deadlock


Click here to download Adams Rite MS1851S-X5X Catalog
Click here to download Adams Rite MS1851S-X5X Installation Instruction
Click here to download Adams Rite Price List