NC Locksmith Exam Section 2 Questions and Answers Solved Correctly
Bible - Answers that portion of the cylinder shell which normally houses the pin chambers, especially
those of a key-in-knob cylinder or certain rim cylinders
Broach - Answers 1. A tool used to cut the keyway into the cylinder plug. 2. To cut the keyway into a
cylinder with a broach
CAM - Answers 1. A lock or cylinder component which transfers the rotational motion of a key or
cylinder plug to the bolt works of the lock. 2. The bolt of a cam lock
Chamber - Answers any cavity in a cylinder plug and or shell which houses the tumblers
Composite Keyway - Answers a keyway that has been enlarged to accept more than one key section,
often key sections of more than one manufacturer
Disc Tumbler - Answers 1. A flat tumbler which can be drawn into the cylinder plug by the proper key so
that none of its extremities extends into the shell. 2. A flat usually rectangular tumbler with a gate which
must be aligned with the sidebar by the proper key. NOTE: sometimes called a wafer tumbler
Graduated Drivers - Answers a set of top pins of different lengths. Usage is based on the height of the
rest of the pin stack, in order to achieve a uniform pin stack height
Increment - Answers a usually uniform increase or decrease in the successive depths of a key cut which
must be matched by a corresponding change in the tumblers
Mogul Cylinder - Answers a pin tumbler cylinder with a diameter of 2.0", whose pins, springs, key, etc.
may also be proportionally increased in sized, it is frequently used in prison locks
Mortise Cylinder - Answers A threaded cylinder typically used in mortise locks of American manufacture
Mushroom pin - Answers a pin tumbler, usually a top pin, which resembles a mushroom. It is typically
used to increase pick resistance
Paracentric - Answers Of or pertaining to a keyway with one or more wards on each side projecting
beyond the vertical center line of the keyway
Peanut cylinder - Answers a mortise cylinder of 3/4" diameter
Pin chamber - Answers the corresponding hole drilled into the cylinder shell and/or plug to accept pins
and springs
Pin stack - Answers all the tumblers in a given pin chamber, see also pin stack height
Pin stack height - Answers the measurement of a pin stack, often expressed in units of the lock
manufacturers increment or as an actual dimension
Bible - Answers that portion of the cylinder shell which normally houses the pin chambers, especially
those of a key-in-knob cylinder or certain rim cylinders
Broach - Answers 1. A tool used to cut the keyway into the cylinder plug. 2. To cut the keyway into a
cylinder with a broach
CAM - Answers 1. A lock or cylinder component which transfers the rotational motion of a key or
cylinder plug to the bolt works of the lock. 2. The bolt of a cam lock
Chamber - Answers any cavity in a cylinder plug and or shell which houses the tumblers
Composite Keyway - Answers a keyway that has been enlarged to accept more than one key section,
often key sections of more than one manufacturer
Disc Tumbler - Answers 1. A flat tumbler which can be drawn into the cylinder plug by the proper key so
that none of its extremities extends into the shell. 2. A flat usually rectangular tumbler with a gate which
must be aligned with the sidebar by the proper key. NOTE: sometimes called a wafer tumbler
Graduated Drivers - Answers a set of top pins of different lengths. Usage is based on the height of the
rest of the pin stack, in order to achieve a uniform pin stack height
Increment - Answers a usually uniform increase or decrease in the successive depths of a key cut which
must be matched by a corresponding change in the tumblers
Mogul Cylinder - Answers a pin tumbler cylinder with a diameter of 2.0", whose pins, springs, key, etc.
may also be proportionally increased in sized, it is frequently used in prison locks
Mortise Cylinder - Answers A threaded cylinder typically used in mortise locks of American manufacture
Mushroom pin - Answers a pin tumbler, usually a top pin, which resembles a mushroom. It is typically
used to increase pick resistance
Paracentric - Answers Of or pertaining to a keyway with one or more wards on each side projecting
beyond the vertical center line of the keyway
Peanut cylinder - Answers a mortise cylinder of 3/4" diameter
Pin chamber - Answers the corresponding hole drilled into the cylinder shell and/or plug to accept pins
and springs
Pin stack - Answers all the tumblers in a given pin chamber, see also pin stack height
Pin stack height - Answers the measurement of a pin stack, often expressed in units of the lock
manufacturers increment or as an actual dimension
