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Description / Abstract:
Introduction
Note: Nothing in this standard supercedes
applicable laws and regulations.
Note: In the event of conflict between the
English and domestic language, the English language shall take
precedence.
Purpose. This standard will provide detailed
design criteria of threaded, extruded barrels for fastening
applications of metric screw threads; M6, M8, M10, and M12 and
unified inch screw threads,7/16 in. These barrels may be used in
heat treated and non-heat treated steel plates for which the
material will be limited. Specific manufacturing requirements will
also be outlined. Different types of extruded barrels can be formed
in each type of steel. This standard will require a type of base
steel, design code designation and thread size after the standard
number, see Section 8.
Mission/Theme. This document should be used in
two (2) manners:
GM design groups should use this document as design information
to choose the best extrusion design for their system and then use
the provided dimensioning detail to add to the base part design.
This standard should be added to the math or drawing as a
controlling specification for the individual extrusions on the base
part.
The part supplier should build the part to meet the design and
performance requirements contained in this standard.
Classification. This standard will be available
to all GM divisions and requesting suppliers.
Extruded. The term extruded is used in
metalworking and is defined as; to force, press, or push through a
die. Extruded fasteners use a stamping process to develop a drawn
barrel to replace the traditional fastener. Parts are made in a
progressive die and can be threaded on or off the primary stamping
line. Figure 1 shows the basic concept of the fastened joint using
an extruded plate. In the case of this standard, all extrusions are
made from a base steel plate. The base plate steel is moved and
used to form the extruded barrel.
Heat Treatment. Part processing for the two (2)
types of materials covered by this standard is very
different:
Non-heat treated parts are completed parts after the stamping
and threading operations.
Heat treated parts receive oven treating at a prescribed
temperature for a prescribed time to obtain the strength
characteristics prescribed in the appropriate material
specification. This heat treating is how a thinner, smaller heat
treated part can perform like a non-heat treated part.
Applicability. Applicable for use on all GM
vehicles and Vehicle Partitioning Product Structure (VPPS)
levels as appropriate.
Remarks. Not applicable.