What does PA stand for?

Piston Angle

Principal Axes

Principal Axes (PA) in golf refer to the key directional planes along which a golf clubhead rotates and moves during the swing and impact. These axes help define how the clubhead interacts with the ball, influencing ball flight, spin, and control. Golf club designers and fitters analyze PA to optimize moment of inertia (MOI), stability, and energy transfer, ensuring consistent performance.

The three principal axes typically considered in golf club dynamics include:

- Heel-to-toe axis (affecting twist and shot dispersion).

- Face angle axis (impacting launch direction and clubface rotation).

- Vertical axis (influencing loft and spin rate on different strikes).

Understanding PA helps golfers choose the right club specifications for better consistency, accuracy, and control based on their individual swing characteristics. Club manufacturers use PA analysis to enhance performance and forgiveness in modern golf equipment.