Special Features:

Locking element area must pass through a ring gage equal to major thd diameter +.003 inch freely or with finger pressure

Properties:

An externally threaded device whose threaded portion is of one nominal diameter with or without a head and having a cup, cone, or other type of machined point designed to prevent or restrict relative movement of parts and designed to be driven with either a wrench or inserted driver. A locking feature may be incorporated in the design of the head or threads.