DICTIONARY

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Lap -
A surface defect appearing as a seam or crack, caused by folding of material during such operations as heading and rolling. Incertain critical locations, such as threads, laps are cause for rejection of precision fasteners.
Lauric Acid -
A lubricant of vegetable fat base (such as coconut oil) often used to reduce friction between mating fasteners.
Lead (angle) -
On a straight thread, the lead angle is the angle made by the helix of the thread with a plane perpendicular to the axis. (The helix angle is the complement of the lead angle.)
Lead (basic, single) -
With respect to a fixed mating thread, the axial distance moved by a part in one complete rotation.
Lead (multiple) -
A multiple lead or multiple start thread, in one complete rotation with respect to a fixed mating thread, moves axially more than one unit of thread pitch, i.e., "double lead", "quadruple lead".
Lead Thread -
That portion of the incomplete thread that is fully formed at the root but not at the crest which occurs at the beginning end of either external or internal threads.
Lock Ring -
A ring which mates with a groove or notch and prevents relative axial motion of two or more parts.
Lock, Thread -
Either local thread deformation or additional material which increases friction to retard relative rotation of mated threaded parts.
Lockbolt -
A fastening system comprised of a headed pin and a malleable collar. The pin is provided with annular locking grooves; the collar is swaged into these grooves by reaction of the tool anvil to pull on the pintail extension by the installation toolin...
Locking Grooves -
Annular grooves in fasteners into which a ring or collar is swaged/formed to accomplish fastening or to provide a mechanical lock.
Locking Torque -


A B C D E F G H I J K L M N O P Q R S U V W Y Z