Thursday, April 24, 2014

Extruding and Tapping v. Weld Nuts

Extruding and Tapping v. Weld Nuts

In the never ending quest to reduce manufacturing costs, manufacturers need to weigh function v. cost in most engineering applications.  The use of an extruded and tapped hole v. weld nuts is one of these decisions.   While a weld nut generally will have a slightly stronger thread than an extruded and tapped hole, is the stronger thread required in every application?  Are we adding extra cost of a weld nut when a stronger thread is over kill?
The costs associated with an extruded and tapped hole can be limited when utilizing In-die tapping.  The costs associated would be the cost of the tapping head, an extra station in the die for the tapping head and some additional die design costs.

The costs for weld nuts include nut insertion equipment, die space for the nut insertion equipment, additional die design costs, weld nuts, storage for the weld nuts and nut insertion equipment when not in use and press downtime when loading a new coil of weld nuts.  This generally leads to more press down time compared to a tapping die.  Both In-die tapping and weld nut insertion can run at comparable press speeds.  The end result is parts utilizing In-die tapping v. weld nuts are far more competitive on a per piece basis.

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