Function: Flexibility of traffic control and installation is offered by 4900 Heavy Duty Deadlatches. A reverse turn of the key while bolt is held retracted retains the bolt, to allow two-way traffic for applications which require free entrance at certain times and exit-only at other times. Interchangeable, without stile modification, with any MS1850A or MS1850S deadbolt of same backset and faceplate shape. Also retrofits to existing 4500 and 4700 Deadlatch preparations. 1-3/4″ minimum door thickness required.
Operation: Turn key or operate handle or paddle to retract spring-loaded latch bolt. To hold bolt retracted, push it in and secure by reverse turn of key. Uses any standard 1-5/32″ mortise cylinder with MS® dimensioned cam.
Bolt Holdback: While bolt is held fully retracted, a reverse turn of the key retains the bolt, allowing the door to be free swinging.
Case: Measures 7/8″ x 5-13/16″ x depth. Depth varies by backset (see table on catalog page). Steel with corrosion-resistant plating. Screw-fastened tube spacer brackets allow for cleaner removal when tab mounting.
Latchbolt: 5/8″ x 1″ x 5/8″ throw. Solid brass. Handing is easily reversible using only a screwdriver.
Auxiliary Latchpin: Stainless steel. Deadlocks latch bolt to prevent “loiding” or case-knife entry.
Faceplates: Measures 1″ x 6-7/8″. Both flat and radius faceplates are supplied. Flat faceplates can also be adjusted in the field for right or left beveled edge doors.
Cylinder Cam: Operable by any standard mortise cylinder with MS® cam, dimensioned as shown. Cylinders with MS® cams can be readily obtained from most cylinder manufacturers.
Standard Package: Individually boxed with flat and radius faceplates, strike, and machine screws for mounting. Order cylinders, paddles, handles, or lever operators separately.