Internal Hair Pin Cotters (Metric Sizes)

internal hair pin cotter diagram


More Information

internal hair pin cotter

  • Secure parts onto shafts with ease of removal and replacement.
  • Hold multiple part shaft assemblies together.
  • Key parts onto shafts directly.
  • Requires a hole through the shaft for hair pin retention.

Stock Materials

  • Steel: 1065 / 1086 spring steel wire to ASTM A227 or ASTM A228
  • Stainless Steel: 300 series spring temper stainless steel wire


  • Steel or Stainless Steel: Plain finish (light oil).
  • Steel: Mechanical zinc plating (processed in house) – lower salt spray hours than zinc electroplate but eliminates hydrogen embrittlement issues.
  • Steel: Electro-zinc plating.
  • Stainless Steel: stress relieved and passivated.


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