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Glossary of Terms

S/A

(abb.) Sub-Assembled
Source: Lock Industry Standards and Training (LIST) Council

Safe

(n.) A substantial, secure container with varying degrees of security and/or fire resistance, used to store valuables against fire or theft.
Source: Lock Industry Standards and Training (LIST) Council

Safe Deposit

(n.) A typically key accessed container that requires dual key operation, usually located inside a vault.
Source: Lock Industry Standards and Training (LIST) Council

Safe Deposit Function

(adj.) An operational characteristic of a lock which requires two separate keys working in tandem to open the lock.
Source: Lock Industry Standards and Training (LIST) Council

Safe Deposit Lock

(n.) A lock that typically requires two separate keys to access a container.
Source: Lock Industry Standards and Training (LIST) Council

Safe Door

(n.) That portion of a safe used to gain access to the contents of the safe in a normal day to day manner.
Source: Lock Industry Standards and Training (LIST) Council

Sally Port

(n.) An access control area with doors or gates secured by interlocks such that only one may be opened at a time.
Source: Lock Industry Standards and Training (LIST) Council

Sash Lock

(n.) A type of window lock.
Source: Lock Industry Standards and Training (LIST) Council

SAVTA

(abb.) Safe and Vault Technicians Association
Source: Lock Industry Standards and Training (LIST) Council

SBCCI

(abb.) Southern Building Code Congress International
Source: Lock Industry Standards and Training (LIST) Council

Scalp

(n.) A thin piece of metal which is usually crimped or spun onto the front of a cylinder. It determines the cylinder's finish and may also serve as the plug retainer.
Source: Lock Industry Standards and Training (LIST) Council

Scandinavian Padlock

(n.) A cast case padlock with an elliptical cross section. The locking mechanism is a set of rotating disc tumblers, which engage notches in the cast shackle and may be rotated by the angled cuts cast on the key.
Source: Lock Industry Standards and Training (LIST) Council

Screen Door Lock

(n.) A lock designed for the thin stiles typically found on screen and storm doors.
Source: Lock Industry Standards and Training (LIST) Council

Screw Change (Wheel)

(n.) A perforated tumbler that may have its combination set by placement of a screw in one of the perforations.
Source: Lock Industry Standards and Training (LIST) Council

Screwless Knob

(n.) A mortise lock knob assembly secured to the spindle without screws.
Source: Lock Industry Standards and Training (LIST) Council

Screwless Rose

(n.) A mortise lock rose installed without screws.
Source: Lock Industry Standards and Training (LIST) Council

SDB

(abb.) Safe Deposit Box
Source: Lock Industry Standards and Training (LIST) Council

Seal

(n.) A single use device intended to give recognizable evidence to the physical opening or entry of a door, container, or space.
Source: Lock Industry Standards and Training (LIST) Council

Second Generation Duplicate

(n.) A key reproduced from a first generation duplicate.
Source: Lock Industry Standards and Training (LIST) Council

Secondary Key

(n.) A key which operates certain locks on a vehicle, but not the ignition lock.
Source: Lock Industry Standards and Training (LIST) Council

Secret Gate Latch

(n.) A small keyless rim latch, which when properly installed, is operated by pressing a concealed actuator.
Source: Lock Industry Standards and Training (LIST) Council

Sectional Trim

(n.) A design that uses two or more escutcheons on the same side of a door for a single lock.
Source: Lock Industry Standards and Training (LIST) Council

Security Collar

(n.) A protective cylinder collar.
Source: Lock Industry Standards and Training (LIST) Council

Security Leg Keyway

(n.) A key section and keyway design that incorporates two non-curved planes of the key blade intersecting at an angle between 1 and 89 degrees.
Source: Lock Industry Standards and Training (LIST) Council

Segmented Follower

(n.) A plug follower sliced into sections which are introduced into the cylinder shell one at a time. It is typically used with profile cylinders.
Source: Lock Industry Standards and Training (LIST) Council

Selective Key System

(n.) A key system in which every key has the capability of being a master key. It is normally used for applications requiring a limited number of keys and extensive cross keying.
Source: Lock Industry Standards and Training (LIST) Council

Selective Master Key

(n.) An unassociated master key which can be made to operate any specific lock(s) in the entire system in addition to the regular master key(s) and/or change key(s) for the cylinder without creating key interchange.
Source: Lock Industry Standards and Training (LIST) Council

Self Closing

(adj.) Pertaining to doors or covers which have a continuous force applied in the closing direction.
Source: Lock Industry Standards and Training (LIST) Council

Semi-Automatic Key Machine

(n.) A machine capable of duplicating keys with limited manual operations.
Source: Lock Industry Standards and Training (LIST) Council

Sequence Of Progression

(n.) The order in which bitting positions are progressed to obtain change key combinations.
Source: Lock Industry Standards and Training (LIST) Council

Series Wafer

(n.) A type of disc tumbler used in certain binary type disc tumbler key-in-knob locks. Its presence requires that no cut be made in that position on the operating key(s).
Source: Lock Industry Standards and Training (LIST) Council

Serrated Fence

(n.) A fence with "V" shaped notches on a contact surface to inhibit manipulation.
Source: Lock Industry Standards and Training (LIST) Council

Serrated Tumbler

(n.) 1. A disk tumbler with "V" shaped notches in its sides that do not allow operation.
(n.) 2. A lever tumbler which has "V" shaped notches in the contact end near the gate.
(n.) 3. A pin tumbler with "V" shaped grooves around its circumference.
(n.) 4. A combination wheel with "V" shaped notches along its outside diameter.
Source: Lock Industry Standards and Training (LIST) Council

Service Code

(n.) In an electronic lock, a factory set or user set code or combination that will open the lock one time.
Source: Lock Industry Standards and Training (LIST) Council

Service Hole

(n.) 1. An aperture aligned with each chamber, providing a path for the ejector pin to drive the entire pin stack from an IC.
(n.) 2. A hole in a cylinder shell intended to provide access for rekeying without disassembly of the cylinder.
Source: Lock Industry Standards and Training (LIST) Council

Service Panel

(n.) The back cover of a safe door which must be opened or removed to allow access for repairs.
Source: Lock Industry Standards and Training (LIST) Council

Servicemark Keyway

(n.) Any keyway whose shape has been configured to receive protection under trademark or servicemark law.
Source: Lock Industry Standards and Training (LIST) Council

Set Screw

(n.) A screw used to fasten a component in a fixed position relative to another component.
Source: Lock Industry Standards and Training (LIST) Council

Set-Up Key

(n.) A key used to calibrate some types of key machines.
Source: Lock Industry Standards and Training (LIST) Council

Set-Up Plug

(n.) A type of loading tool shaped like a plug follower. It contains pin chambers and is used with a shove knife to load springs and top pins into a cylinder shell.
Source: Lock Industry Standards and Training (LIST) Council

Seven Column Progression

(n.) A process wherein key bittings are obtained by using the cut possibilities in seven columns of the key bitting array.
Source: Lock Industry Standards and Training (LIST) Council

Seven Pin Master Key

(n.) A master key for all combinations obtained by progressing seven bitting positions.
Source: Lock Industry Standards and Training (LIST) Council

Sex Bolt

(n.) A nut and bolt set used to through bolt, with a closed nut basically flush with the mounting surface creating the appearance of a carriage bolt.
Source: Lock Industry Standards and Training (LIST) Council

SFIC

(abb.) Small Format Interchangeable Core
Source: Lock Industry Standards and Training (LIST) Council

Shackle

(n.) 1. The part of a padlock, which passes through an opening in an object or fits around an object and is ultimately locked into the case.
(n.) 2. The portion of a restraint which fits around the wrist, ankle, neck, waist or thumb.
Source: Lock Industry Standards and Training (LIST) Council

Shackle Retaining Pin

(n.) A pin which keeps an unlocked shackle heel in the case.
Source: Lock Industry Standards and Training (LIST) Council

Shackle Spring

(n.) A spring which pushes the shackle into the open position when the padlock is unlocked.
Source: Lock Industry Standards and Training (LIST) Council

Shank

(n.) 1. The part of a bit key between the bow and the stop; or, if there is no shoulder stop, the part between the bow and the near side of the bit.
(n.) 2. A smaller diameter portion of a knob that is positioned between the larger portion of the knob and the rose or the door surface.
Source: Lock Industry Standards and Training (LIST) Council

SHDA

(abb.) Security Hardware Distributors Association (formerly NLSA)
Source: Lock Industry Standards and Training (LIST) Council

Shear Line

(n.) A location in a cylinder at which specific tumbler surfaces must be aligned, removing obstruction(s) which prevented the plug from moving.
Source: Lock Industry Standards and Training (LIST) Council

Shell

(n.) The part of the cylinder which surrounds the plug and which usually contains tumbler chambers corresponding to those in the plug.
Source: Lock Industry Standards and Training (LIST) Council

Shim

(n.) 1. A thin piece of material used to unlock the cylinder plug from the shell by separating the pin tumblers at the shear line, one at a time.
(v.) 2. To unlock a cylinder plug from its shell by using a shim.
Source: Lock Industry Standards and Training (LIST) Council

Shoe

(n.) 1. A bracket which attaches the arm of a door closer to the door or frame.
(n.) 2. The surface mounted case and guide components of an exit device.
(n.) 3. A mortise lock component which transfers pivoting motion of a thumbpiece to linear movement of the latch bolt.
Source: Lock Industry Standards and Training (LIST) Council

Shoulder

(n.) Any key stop other than a tip stop.
Source: Lock Industry Standards and Training (LIST) Council

Shouldered Chamber

(n.) A pin chamber with an internal shelf that limits travel of a complementarily shaped bottom pin.
Source: Lock Industry Standards and Training (LIST) Council

Shouldered Pin

(n.) A pin tumbler shaped as to prevent it from fully entering an unoccupied keyway or limit its travel within a pin chamber.
Source: Lock Industry Standards and Training (LIST) Council

Shouldered Spindle

(n.) In a safe lock, a spindle with a larger uniform diameter toward outside to prevent punching the spindle into the container.
Source: Lock Industry Standards and Training (LIST) Council

Shove Knife

(n.) A tool used with a set-up plug which pushes the springs and pin tumblers into the cylinder shell.
Source: Lock Industry Standards and Training (LIST) Council

Showcase Lock

(n.) Normally a ratchet lock or plunger lock used on bypassing doors.
Source: Lock Industry Standards and Training (LIST) Council

Shrouded Shackle

(n.) A shackle which is protected from cutting or tampering by design or by the use of secondary shields.
Source: Lock Industry Standards and Training (LIST) Council

Shunt Switch

(n.) A maintained contact switch, often key operated.
Source: Lock Industry Standards and Training (LIST) Council

Shut Out Key

(n.) Usually used in hotel keying systems, a key which will make the lock inoperative to all other keys in the system except the emergency master key, display key, and some types of shut out keys.
Source: Lock Industry Standards and Training (LIST) Council

Shut Out Mode

(n.) The state of a hotel function lockset which prevents operation by all keys except the emergency master key, display key, and some types of shut out keys.
Source: Lock Industry Standards and Training (LIST) Council

Shutter

(n.) 1. A spring-loaded device which closes upon the removal of a cylinder tailpiece, protecting a locking device from being manipulated.
(n.) 2. A spring-loaded device which covers a cylinder keyway when the key is not in it.
Source: Lock Industry Standards and Training (LIST) Council

Shutter Spring

(n.) A spring which returns the shutter on a lock to the closed position.
Source: Lock Industry Standards and Training (LIST) Council

Sickle Key

(n.) A key in the form of a sickle inserted through a hole in a door to actuate a bolt on the opposite side of the door.
Source: Lock Industry Standards and Training (LIST) Council

Side Milling Slotter

(n.) A key machine cutting wheel with a squared edge that can cut on the side as well as the periphery of the wheel.
Source: Lock Industry Standards and Training (LIST) Council

Side Sheath

(n.) A portion of a multi-part pin tumbler lock plug used to complete the shear line fully around the plug.
Source: Lock Industry Standards and Training (LIST) Council

Side Ward

(n.) A ward which prevents entry of an incorrect key into a non cylinder lock.
Source: Lock Industry Standards and Training (LIST) Council

Side Ward Cut

(n.) A cut made into a key to bypass a side ward.
Source: Lock Industry Standards and Training (LIST) Council

Sidebar Lock

(n.) A lock mechanism which incorporates a sidebar.
Source: Lock Industry Standards and Training (LIST) Council

Sidebar

(n.) A cylinder locking member mounted longitudinally in a plug, which engages multiple tumblers.
Source: Lock Industry Standards and Training (LIST) Council

Sidecode Variant

(n.) A master keying style of pin tumbler locks which uses the keying capabilities of the secondary security technology to effect master keyed locking. Obtaining a single key in the system does not reveal the same secondary combination of all keys.
Source: Lock Industry Standards and Training (LIST) Council

Sidewinder Key

(n.) Typically an automotive key with a bitting(s) milled into the widest side(s) of the key blade with an end milling cutter.
Source: Lock Industry Standards and Training (LIST) Council

Silent Signal

(adj.) Describes an alarm that annunciates detection to a remote location instead of a local location.
Source: Lock Industry Standards and Training (LIST) Council

Simple Latch

(n.) A non deadlocking latch.
Source: Lock Industry Standards and Training (LIST) Council

Simplex Key Section

(n.) A single independent key section which cannot be used in a multiplex key system.
Source: Lock Industry Standards and Training (LIST) Council

Simultaneous Retraction

(n.) A feature which allows retraction of both the deadbolt and latchbolt in the same operation.
Source: Lock Industry Standards and Training (LIST) Council

Single Acting (Door)

(n.) A door which swings from the latched position in only one direction.
Source: Lock Industry Standards and Training (LIST) Council

Single Acting Lever Tumbler

(n.) A lever tumbler which must be moved a minimum distance to allow travel of a bolt, but cannot be moved so far as to restrict travel of the bolt.
Source: Lock Industry Standards and Training (LIST) Council

Single Cylinder

(adj.) Pertaining to a lock with key operation from only one side.
Source: Lock Industry Standards and Training (LIST) Council

Single Key Section

(n.) An individual key section which can be used in a multiplex key system.
Source: Lock Industry Standards and Training (LIST) Council

Single Step Progression

(n.) A progression using a one increment difference between bittings of a given position.
Source: Lock Industry Standards and Training (LIST) Council

Single-D

(adj.) The shape of a cutout for a lock, circular except for a flat section on one side.
Source: Lock Industry Standards and Training (LIST) Council

Six Column Progression

(n.) A process wherein key bittings are obtained by using the cut possibilities in six columns of the key bitting array.
Source: Lock Industry Standards and Training (LIST) Council

Six Pin Master Key

(n.) A master key for all combinations obtained by progressing six bitting positions.
Source: Lock Industry Standards and Training (LIST) Council

SKCS

(abb.) Standard Key Coding System
Source: Lock Industry Standards and Training (LIST) Council

SKD

(sym.) Symbol for "single keyed", normally followed by a numerical designation in the standard key coding system; e.g., SKD1, SKD2, etc. It indicates that a cylinder or lock is not master keyed but is part of the keying system.
Source: Lock Industry Standards and Training (LIST) Council

Skeleton Key

(n.) 1. A key with a large portion of the bit filed away so that it can open different locks. Also called passkey.
(n.) 2. A passkey with much of the bit filed away so that it can open different locks.
Source: Dictionary.com
(n.) Any non cylinder key whose bit, blade, and/or post is cut away enough to allow it to enter and turn in locks with different ward arrangements.
Source: Lock Industry Standards and Training (LIST) Council

Slide Hammer

(n.) A tool made from a rod with a handle, a sliding weight on the rod, and a means of attaching to a part to force its movement relative to other parts.
Source: Lock Industry Standards and Training (LIST) Council

Slider

(n.) A tumbler which is normally flat, has a gate and moves with a linear or lateral motion instead of pivoting like a lever tumbler.
Source: Lock Industry Standards and Training (LIST) Council

Slim Jim

(n.) A narrow strip of spring steel used to bypass the cylinder and unlock vehicle doors.
Source: Lock Industry Standards and Training (LIST) Council

Sling

(n.) A cable or layered length of fabric, (usually the latter), with woven loops in both ends, used to lift a safe or vault door with a boom arm lift or forklift.
Source: Lock Industry Standards and Training (LIST) Council

Slotter

(n.) A key machine cutter designed to make cuts with a rectangular shape.
Source: Lock Industry Standards and Training (LIST) Council

Small Format Interchangeable Core

(n.) An interchangeable core that replicates the functionality and design popularized by Best.
Source: Lock Industry Standards and Training (LIST) Council

Smartcard

(n.) A card conforming to ISO specification 7810 and 7816 which one or more integrated circuits with contacts allowing interface to external equipment.
Source: Lock Industry Standards and Training (LIST) Council

SMK

(abb.) Sub-Master Key
Source: Lock Industry Standards and Training (LIST) Council

SMNA

(abb.) Safe Manufacturers' National Association
Source: Lock Industry Standards and Training (LIST) Council

Smokeproof

(adj.) Referring to an area or opening protected against the penetration of smoke.
Source: Lock Industry Standards and Training (LIST) Council

Snap Bow

(n.) 1. A separate bow which can be affixed to a smaller key bow.
(n.) 2. A bow which retrofits transponder technology to conventional keys for use in access control systems.
Source: Lock Industry Standards and Training (LIST) Council

Software Key

(n.) Data used by software to provide or deny access.
Source: Lock Industry Standards and Training (LIST) Council

Spacing

(n.) The dimensions from the stop to the center of the first cut and/or to the centers of successive cuts.
Source: Lock Industry Standards and Training (LIST) Council

Spanner Wrench

(n.) A tool for installing, removing or adjusting a threaded part. The tool is designed to engage one or more holes or depressions which are peripheral or not on-center to the part axis.
Source: Lock Industry Standards and Training (LIST) Council

Spare Tire Lock

(n.) A lock designed to prevent removal of a vehicle's spare tire.
Source: Lock Industry Standards and Training (LIST) Council

Special Application Cylinder

(n.) Any cylinder other than a mortise, rim, key-in-knob or profile cylinder.
Source: Lock Industry Standards and Training (LIST) Council

Spider Cam

(n.) A rotary mechanism serving to simultaneously control the operation of multiple bolts with a radial arrangement.
Source: Lock Industry Standards and Training (LIST) Council

Spider Lock

(n.) A lock that utilizes a special cam as an integral part of the lock to extend or retract the multiple bolts of the lock simultaneously.
Source: Lock Industry Standards and Training (LIST) Council

Spindle

(n.) A component which transfers rotary motion from outside a lock or latch case to an inner mechanism.
Source: Lock Industry Standards and Training (LIST) Council

Spline

(n.) A groove in a combination lock spindle designed to accept a spline key.
Source: Lock Industry Standards and Training (LIST) Council

Spline Key

(n.) A device inserted to position the drive cam relative to the spindle in a combination lock.
Source: Lock Industry Standards and Training (LIST) Council

Spline Way

(n.) A notch in a combination lock drive cam designed to accept a spline key.
Source: Lock Industry Standards and Training (LIST) Council

Split Astragal

(n.) An astragal constructed of two pieces; each piece being mounted on either door of the pair, and abutting to create a seal.
Source: Lock Industry Standards and Training (LIST) Council

Split Bolt

(adj.) Two separate bolts housed in the same opening in a face of a lock, each operated independently from opposite sides of the door.
Source: Lock Industry Standards and Training (LIST) Council

Split Finish

(adj.) Of or pertaining to a lockset whose finish is different on each side of the door.
Source: Lock Industry Standards and Training (LIST) Council

Split Hub

(n.) A two-piece hub which can allow motion from one side of a swivel spindle while preventing it from the other side.
Source: Lock Industry Standards and Training (LIST) Council

Split Pin Master Keying

(n.) A method of master keying a pin tumbler cylinder by installing master pins into one or more pin chambers.
Source: Lock Industry Standards and Training (LIST) Council

Split Spindle

(n.) A multi piece spindle which allows a knob or lever to be installed on only one side of a door.
Source: Lock Industry Standards and Training (LIST) Council

Split Wafer

(n.) Disc tumblers which are approximately half the width of a full tumbler used in the same lock, and are paired adjacent to one another in the same cut position. Typically used in automotive locks.
Source: Lock Industry Standards and Training (LIST) Council

Spool Pin

(n.) Usually a top pin which resembles a spool, typically used to increase pick resistance.
Source: Lock Industry Standards and Training (LIST) Council

Spring Cover

(n.) A device for sealing one or more pin chambers.
Source: Lock Industry Standards and Training (LIST) Council

Spring Hinge

(n.) A hinge incorporating a mechanism to apply automatic closing force.
Source: Lock Industry Standards and Training (LIST) Council

Spring Latch

(n.) A latch operated under spring pressure, having no deadlatching feature.
Source: Lock Industry Standards and Training (LIST) Council

Spring Seat

(n.) The point at which a spring is anchored, located or attached and at which (from which) it exerts force.
Source: Lock Industry Standards and Training (LIST) Council

Spy-Proof Dial

(n.) A dial and dial ring that complement each other to limit viewable numbers to a range of approximately 10 at a time.
Source: Lock Industry Standards and Training (LIST) Council

Square Back

(adj.) Pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a square.
Source: Lock Industry Standards and Training (LIST) Council

Square Corner Latch

(n.) A latch with a face whose sides meet at 90 degree angles.
Source: Lock Industry Standards and Training (LIST) Council

Stand Alone

(n.) A self contained electronic lock device.
Source: Lock Industry Standards and Training (LIST) Council

Standard Key Coding System

(n.) An industry standard and uniform method of designating all keys and/or cylinders in a master key system. The designation automatically indicates the exact function and keying level of each key and/or cylinder in the system, usually without further explanation.
Source: Lock Industry Standards and Training (LIST) Council

Standard Progression Format

(n.) A systematic method of listing and relating all change key combinations to all master key combinations in a master key system. The listing is divided into segments known as blocks, horizontal groups, vertical groups, rows, and pages, for levels of control.
Source: Lock Industry Standards and Training (LIST) Council

Standards

(n.) A set of specifications relating to materials, finishes, construction, resistance, or strength that typically establish a minimum acceptable value.
Source: Lock Industry Standards and Training (LIST) Council

Staple

(n.) The portion of a hasp assembly with the hole or opening to receive a padlock.
Source: Lock Industry Standards and Training (LIST) Council

Step Pin

(n.) A spool or mushroom pin which has had a portion of its end machined to a smaller diameter than the opposite end. It is typically used as a top pin to improve pick resistance by some manufacturers of high security cylinders.
Source: Lock Industry Standards and Training (LIST) Council

Stepped Tumbler

(n.) A special (usually disc) tumbler used in master keying. It has multiple bearing surfaces for blades of different key sections.
Source: Lock Industry Standards and Training (LIST) Council

Stile

(n.) The vertical construction member located on either edge of a door.
Source: Lock Industry Standards and Training (LIST) Council

Stop (Of A Door)

(n.) The projecting portion of a doorframe upon which the door rests when closed.
Source: Lock Industry Standards and Training (LIST) Council

Stop (Of A Key)

(n.) The part of a key from which all cuts are indexed and which determines how far the key enters the keyway.
Source: Lock Industry Standards and Training (LIST) Council

Stop Gauge

(n.) The part of a key machine that aligns a key blank, a pattern key, or both, so that the blank may be cut correctly.
Source: Lock Industry Standards and Training (LIST) Council

Stop Works

(n.) A button or toggle mechanism which prevents operation of a knob, lever or thumbpiece in a non-bored lock.
Source: Lock Industry Standards and Training (LIST) Council

Stop Works Button(s)

(n.) A one or two-piece stop works activator.
Source: Lock Industry Standards and Training (LIST) Council

Store Door Function

(n.) A lockset function in which: a) a deadbolt is operated by key from either side and a latch is operated by working trim from either side; or b) a deadlocking latch can be withdrawn by working trim from either side except when both sides are locked by key from either side.
Source: Lock Industry Standards and Training (LIST) Council

STPRP

(abb.) "Safe Technicians Proficiency Registration Program"; the certification program of SAVTA as administered by ALOA.
Source: Lock Industry Standards and Training (LIST) Council

Straight Knife

(n.) A bypass tool for manipulating a spring bolt directly behind the cylinder plug.
Source: Lock Industry Standards and Training (LIST) Council

Strike Locator

(n.) A tool used to mark the jamb, relative to the bolt of the lock, prior to strike installation.
Source: Lock Industry Standards and Training (LIST) Council

Strike Reinforcer

(n.) A metal plate mounted behind a strike, using long screws to secure it to the door frame.
Source: Lock Industry Standards and Training (LIST) Council

Strike

(n.) A bolt receptacle typically mounted in the door jamb or the floor.
Source: Lock Industry Standards and Training (LIST) Council

Strikethru Keying

(n.) A means of shaping a key bitting by tooling which presses the key in such a way as to leave an indentation on one bitted surface or side of the key, and a protrusion on the other.
Source: Lock Industry Standards and Training (LIST) Council

Stump

(n.) The stationary fence(s) in a lever lock.
Source: Lock Industry Standards and Training (LIST) Council

Sub-Master Key

(n.) The master key level immediately below the master key in a system of six or more levels of keying.
Source: Lock Industry Standards and Training (LIST) Council

Substitution Code

(n.) A code whose individual characters are converted to individual key cuts or combination numbers by means of a reference table.
Source: Lock Industry Standards and Training (LIST) Council

Suffolk Latch

(n.) A door latch consisting of a horizontal bar which moves vertically to unlatch on the inside, actuated by a thumb piece on the outside.
Source: Lock Industry Standards and Training (LIST) Council

Supervised Security Seal

(n.) A device which provides visual indication of tampering and includes the ability to be connected into electronic security systems.
Source: Lock Industry Standards and Training (LIST) Council

Surface Pull

(n.) A handle or grip attached to the surface of a door or drawer.
Source: Lock Industry Standards and Training (LIST) Council

Sweep

(n.) The radiused part of a lever tumbler with which the key makes contact.
Source: Lock Industry Standards and Training (LIST) Council

Sweep Speed

(n.) The speed at which a closer moves a door from open to the point where latching speed is engaged.
Source: Lock Industry Standards and Training (LIST) Council

Swing Clear Hinge

(n.) A hinge that allows the door to swing far enough away from the jamb to fully clear the opening at 90 degrees open.
Source: Lock Industry Standards and Training (LIST) Council

Switch Lock

(n.) 1. A lock which incorporates an electrical switch as an integral part of its construction.
(n.) 2. A large padlock designed for use on railroad switches.
Source: Lock Industry Standards and Training (LIST) Council

Swivel Spindle

(n.) Normally a two-piece spindle assembly whose two halves are designed to turn independently.
Source: Lock Industry Standards and Training (LIST) Council