Cold Headed Parts Terms
– A compound used on the thread of fasteners to prevent the galling
of mating surfaces and improve corrosion resistance so the parts can be
– The stress
that is applied by a fastener to a joint face.
– Surfaces that are
rough or otherwise unsatisfactory, caused by a slight jumping of the tool
away from the work or the other way around.
– The force that
is exerted on the joint by the fastener.
– A fastener’s
ability to hold together previously separated materials.
– The process of deforming
metal at room temperature by hammering, drawing or forming.
– The condition
in which two fastener surfaces share the same center.
– The permanent deformation
of a fastener resulting from the application of stress and heat.
The portion of the die surface that shapes the forging.
The degree of difference between the centers of a fastener’s surface
at different points.
The process of forcing metal to flow through a die orifice in the same
direction in which energy is being applied (forward extrusion) or in the
reverse direction (backward extrusion), in which case the metal usually
follows the contour of the punch or moving forming tool.
– A fastener’s fracture resistance ability during subjection
to variations of stress.
manipulation of wire, rod or bar stock in dies to form parts that generally
contain portions that are greater in cross-sectional area than the original
wire, rod or bar. Basically, heading is the creation of a head on a
metal part via cold form molding.
– A cavity, or series
of cavities (multiple), machined into a forging die to produce a desired
configuration in the workpiece during forging.
– A piece of steel that
is tightly fixed in a die. The insert may be used to fill a cavity, to
replace a portion of the die with a grade of steel that is better suited
for service or to function as a small die with the impression fastened
to a master die.
material(s) that the fastener connects together.
– A measurement
indicating the length between the beginning of a thread and the point
at which the thread reaches its fullest size.
– The process of
tapping a thread after plating so that its tolerances will comply within
specification and allow the internal and external threads to assemble.
– The distance between
– The immediate tension
of a fastener after tightening, which will reduce over time.
main reciprocating member of a press, guided in the press frame, to which
the punch or upper die is fastened.
part of the fastener body between the head and the threaded portion.