The signal sash lock is an old pattern. It is designed for use on the checkrails of large or inaccessible double-hung sash which are to be locked and unlocked using a pole. The extended locking arm on this lock makes it especially suitable for the 1 3/4" and 2 1/4" thick sash usually found in large public or institutional buildings. Strike: 3/4" x 2-1/4" Base: 7/8" x 2-1/4" Depth when locked: 3-5/8" Height when unlocked: 3-5/8" Pole hook hole diameter: 9/16" |
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