Spline

The spline refers to the stiffest direction of an arrow shaft.

No shaft is perfectly uniform in stiffness; manufacturing creates a slight primary stiffness direction, which is called the spline.

Significance:

  • Affects how the arrow bends upon release
  • Can influence consistency in grouping
  • Considered in high-quality arrow construction

Application:

  • Some archers align all their arrows so that the spline points in the same direction (e.g., toward the index feather) to achieve maximum consistency.
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