Why Golf Shafts Are Not Perfectly Uniform, and Why Orientation Matters

Golf shafts can contain small differences in straightness, roundness and stiffness around their circumference. SST PURE analyzes each individual shaft to find the orientation in which off-line bending and twisting are minimized, so the shaft can be installed in its most stable position instead of an arbitrary one.

Last updated: October 1, 2026

A shaft can be excellent without being identical in every direction

Modern shaft manufacturing produces highly sophisticated products, but “high quality” does not mean an individual shaft is mathematically identical at every point around its circumference. SST PURE’s technical explanation focuses on three kinds of variation: straightness, roundness and stiffness.

The point is not to label a shaft good or bad. It is to recognize that every individual shaft has an orientation in which it behaves most stably.

Why individual analysis matters

Two shafts with the same model, weight and flex are still two individual physical objects. SST PURE therefore analyzes each shaft rather than assuming a universal logo position or a single orientation for every shaft of that model.

Logo position is not a performance measurement

“Logo Up” means the shaft logo faces straight up at address. The logo position is set during manufacturing for appearance and consistency of graphics; it is not a measurement of the shaft’s most stable plane.

Independent Testing: Plugged In Golf

In a 36-shaft study, Plugged In Golf found that graphite shafts’ SST PURE position averaged 75 degrees away from logo up, and only two shafts landed near logo down. Shafts do not naturally PURE to a logo position.

READ THE INDEPENDENT TEST →

What the neutral axis means

SST PURE calls the stable plane the neutral plane, or SST PURE plane: the plane where off-line bending and twisting are minimized as the shaft flexes. PURE stands for Plane of Uniform Repeatability. Learn how the SST PURE process works.

Why this matters after a fitting

A fitting identifies the shaft model and specifications that best match a golfer. Alignment is a separate assembly question. If the goal of a custom build is repeatability, analyzing the selected shaft’s orientation removes one more variable. See who benefits from SST PURE.

Consistency is the core idea

The best way to explain shaft alignment is not as magic distance. It is variable control: understand the individual shaft, identify its stable orientation, and assemble the club intentionally. The SST PURE Shaft Analysis Report documents exactly what was measured.

Frequently asked questions

Are two golf shafts of the same model exactly identical?

They are manufactured to the same design, but individual shafts contain structural irregularities and are not perfectly straight, round or equally stiff in every direction.

Does the shaft logo show the best orientation?

No. SST PURE treats Logo Up as a reference position, not as proof of the shaft’s most stable orientation. Independent analysis found PURE positions are spread around the shaft, not clustered at the logo.

What is the neutral plane?

It is the plane where off-line bending and twisting are minimized when the shaft is flexed. SST PURE locates it with computerized analysis and marks it for assembly.