ASME B1.7:2006 pdf download.Screw Threads:Nomenclature,Definitions, and Letter Symbols.
bilateral tolerance: a tolerance in which variation is equally larger and smaller than the specified dimension.
a design plan that uses only bilateral tolerances.
black crest thread: a thread whose crest displays the unfinished cast, rolled, or forged surface.
blunt start thread: a thread with removal of the incomplete thread at the starting end (see Fig. 4). This is a feature of the threaded parts that are repeatedly assembled by hand, such as hose couplings and thread gages, to prevent cutting of hands and crossing of threads. Also known as l-ligbee cut or a convoluted thread.
bottom of chamfer: the intersection of the chamfer cone and the pitch cone of an internal taper pipe thread (see Fig. 5).
chamfer: a conical surface at the starting end of a thread. characteristic: the quality(s), peculiarity(s), or feature(s) that is a conspicuous or prominent detail(s) of the thread. See also attribute and element.
class of thread: an alphanumerical designation to indicate the standard grade of tolerance and allowance specified for a thread (e.g., 2A, 28).
den mace fit: a fit between mating assembled parts that provides a clearance at their maximum material condition.
clearance flank: the flank that does not take the externally applied axial load in an assembly (see Fig. 6).
coated thread: a thread with one or more applications of additive material. This includes dry film lubricants, but excludes soft or liquid lubricants that are readily displaced in assembly and gaging. Plating and anodizing are included as coatings.
comnion boundary: the portion of the basic profile common to the maximum material conditions of the external and internal threads. Violation of the common boundary produces interference.
a design plan that uses only bilateral tolerances.
black crest thread: a thread whose crest displays the unfinished cast, rolled, or forged surface.
blunt start thread: a thread with removal of the incomplete thread at the starting end (see Fig. 4). This is a feature of the threaded parts that are repeatedly assembled by hand, such as hose couplings and thread gages, to prevent cutting of hands and crossing of threads. Also known as l-ligbee cut or a convoluted thread.
bottom of chamfer: the intersection of the chamfer cone and the pitch cone of an internal taper pipe thread (see Fig. 5).
chamfer: a conical surface at the starting end of a thread. characteristic: the quality(s), peculiarity(s), or feature(s) that is a conspicuous or prominent detail(s) of the thread. See also attribute and element.
class of thread: an alphanumerical designation to indicate the standard grade of tolerance and allowance specified for a thread (e.g., 2A, 28).
den mace fit: a fit between mating assembled parts that provides a clearance at their maximum material condition.
clearance flank: the flank that does not take the externally applied axial load in an assembly (see Fig. 6).
coated thread: a thread with one or more applications of additive material. This includes dry film lubricants, but excludes soft or liquid lubricants that are readily displaced in assembly and gaging. Plating and anodizing are included as coatings.
comnion boundary: the portion of the basic profile common to the maximum material conditions of the external and internal threads. Violation of the common boundary produces interference.
