What Is SPR?

Henrob Self-Pierce Riveting (SPR) is a cold joining process used to fasten two or more sheets of material by driving a rivet through the top sheet(s) and upsetting the rivet, under the influence of a die, into the lower sheet without piercing it.

Speed and quiet operation are features of each system. Typical riveting cycle time ranges from 1.0 to 4 seconds.

SPR has a number of advantages over other joining techniques, such as welding and blind riveting:

  • Joins a range of dissimilar materials such as:
    • Steel
    • Aluminium
    • Plastics
  • Joins multiple material stacks
  • Non-thermal process - can be used after coating or painting with virtually no aesthetic or other damage
  • Low energy demands
  • Fast cycle times
  • Operator and environment friendly; no heat, fumes, sparks or waste
  • Repeatable quality
  • Compatible with adhesives and lubricants
  • Automatic rivet feed allows continuous production