1875 Two-Point Deadlock

1875 Two-Point Deadlock provides security for roll-up doors, security screens, or similar doors. Two-point locking is achieved using two bolts, which are operational from either or both sides of the deadlock.


For overhead doors, roll-up security screens, or similar doors. Provides turn operation of two bolts from either or both sides. Accepts standard mortise cylinders for key control of bolts to secure them in either projected or retracted position.



90° rotation of turn projects or retracts bolts. 360° turn of key deadlocks mechanism, preventing operation of the turn in either 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.



Cylinder Backset: Bolt arms require inside stile clearance of 1-11/16" [42.9 mm] on one side of cylinder center, 1" [25.4 mm] on the other.

Case: Measures 1" x 6" x 2-5/8" [25.4 mm x 152.4 mm x 66.7 mm]. Steel with corrosion-resistant plating.

Bolt Arms: 1-1/32" [26.2 mm] throw. Threaded for 1/4" – 20 rods. Because of design variations in this type of door, no standard bolt can be offered to fit all makes of doors. Please contact factory for more information on bolts, rods, bolt guides, and strikes to fit individual door designs.

Turn: 4060 Turn, available separately. Zinc alloy escutcheon and handle. Available in 130 to match 628 Clear Anodized finish. Steel spindle is also available to accommodate various door thicknesses.

Standard Package: Individually boxed. Cylinder and/orthumbturn available separately.

Shipping weight: 1-1/2 lbs [0.68 kg]



• 4060 Turn available separately with choice of spindle lengths
• Bolt, connecting rod, bolt guide, strike available separately by special order


Related Products: When purchasing this product, please consider the following related products, available separately:

Accessories Cylinders Special Order Options

4060 turn 

Standard 1" length, 1-5/32” diameter mortise cylinder with MS® cam such as 4036 Mortise Cylinder, 4066 Thumbturn
31-0278-XX Bolt and Connecting Rod Assembly by special order only.