An Improved Self-Piercing Rivet
Stephen N. Van Hall and Kip O. Findley
Summary: A processing method to fabricate self-piercing rivets with enhanced ductility and
improved strength.
Description: Self-piercing rivets with improved mechanical properties have been manufactured
with slight modifications to standard processing methods. The rivets have an equivalent column
strength to conventional self-piercing rivets, but the ability to flare significantly more during
riveting than currently used rivets. The combination of properties produced through the new
processing method enables improved versatility in the application of rivets to multiple joining
configurations. Currently, rivet strengths and rivet and die geometries are selected to optimize
specific joining configurations, resulting in numerous combinations of rivets and dies that are
implemented in production. These improved self-piercing rivets would enable the reduction of
rivet and die combinations, thus improving manufacturing efficiency and producing cost savings.
Furthermore, the automotive industry is increasingly utilizing mixed material combinations that
are challenging to weld. Self-pierce riveting is a viable solution for these mixed material joints,
but there are increasingly situations where the steel sheet is too strong for current rivet alloys.
The invented processing method allows rivets to produce the strength and ductility necessary to
produce mixed material joints involving ultra-high strength steels.
Main Advantages of this Invention
 Reduction of the number of unique rivets can
reduce complexity and cost in manufacturing.
 The rivets can also join sheet metal
combinations that include ultra-high strength
steel sheets
Potential Areas of Application
 Automotive, Aerospace, and Nautical
 Building and Bridge Construction
ID number: 17006
Intel ectual Property Status: US provisional patent filed on Sept. 18, 2016.
Opportunity: We are seeking an exclusive or non-exclusive licensee for marketing,
manufacturing, and sale of this technology.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: