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    Sash A framing for windowpanes. A sash window is generally understood to be a double-hung, vertically sliding window.

    Satin Finish Architectural or builders’ hardware that has been scoured with an abrasive to achieve a dull lustre.

    Schedule A list of parts or components (such as a hardware schedule).

    Scheduling The detailing of openings or doors, listing their locations and the door and frame materials, and the listing of hardware in detail and quantity

    Scheduling Sequence A proper and orderly listing of various hardware items for each door.

    Scouring The application of a fine abrasive to achieve a satin, or dull, finish. The abrasive may be applied by hand, wheel or belt.

    Section An orthographic projection that has been cut apart to show interior features.

    Servant Key The individual key to a lock in a master key system.

    Service Key See Servant Key.

    Services Key A servant key used to operate a number of locks, e.g., locks for fire services, buildings’ services or emergency services.

    Sequence Closer A door closer that automatically closes a pair of fire rated doors in sequence so as to ensure correct latching.

    Shank (of a knob) The projecting stem of a knob into which the spindle is fastened.

    Shear Line The interface between the plug and shell in a cylinder that is normally obstructed by the pin tumblers. The pins must be raised to the shear line by the correct key to allow the plug/key to turn.

    Short Backset Locks Locks suitable for narrow stile doors.

    Shutter See Curtain.

    Shutter Hinge See Hinge.

    Side Bar Mechanism A method, additional to tumblers, of preventing the barrel from rotating in the cylinder housing.

    Sidelight A narrow window adjacent to a door.

    Silencer A small piece of resilient material attached to the stop on a door frame to cushion the closing of the door.

    Sill The stone or wood member across the bottom of a door or window opening. Also the bottom member on which a building frame rests (sill plate).

    Single-Acting Door A door mounted to swing to only one side of the plane of its frame.

    Single-Action Escape Lockset A locket installed to a door where exit is obtained by a single action without the use of a key.

    Single-Rebate Frame A door frame having only one rebate.

    Sintering The solidification and fusing of compressed powdered metal.

    Sliding Door Pull A pull that is either flush with the edge of the door or with the face of a sliding door.

    Snib A device used to either hold back or lock the bolt.

    Soffit The under surface of the stop at the frame head. That portion of a door frame between the rebates on a double-rebated frame or between the rebate and the outer edge of the frame on the stop side of a single-rebated frame. Sometimes referred to as the “stop width”.

    Span The distance between structural supports (i.e., the length of a joist, rafter or other member).

    Specification A written document that accompanies the working drawings, which sets forth standards for the materials used in the construction of buildings. It also covers all conditions relating to that construction or type of construction.

    Spindle The drive shaft that connects the knob or lever to the latch or lock mechanism to operate the bolt.

    Spinning A process for shaping sheet metal into rounded objects. During the process a tool is pressed against the sheet metal as it revolves.

    Split Spindle A spindle consisting of two half-spindles which allow independent functions on each side of the lock.

    Spool Pin A double ended mushroom pin.

    Spraying The process of coating materials with paint or clear lacquer by use of air pressure or see cat.

    Springbolt See Latchbolt.

    Spring Hinge See Hinge.

    Staple A surface-mounted strike.

    Stator Intermediate sleeve between barrel and cylinder.

    Stile The vertical members of a door to which the lock and hinges are applied.

    Storeroom Locks a) Outside – opened by key, knob or lever is always rigid. b) Inside – opened by knob or lever at all times.

    Strap Hinge See Hinge.

    Strike A device fixed in or on a door jamb into which the lock or latch bolt engages when the door is closed.

    Strike Box A component used in conjunction with the strike plate to help protect the bolt against end pressure.

    Strike Lip The leading edge of a strike which is usually curved to engage the bevelled face of a latchbolt.

    Stud The vertical member that forms the framework of a partition or wall and editor of this glossary.

    Surface Bolt A rod or bolt mounted on the face of the inactive door of a pair to lock it to the fra