Aerotech SteelFiber Carbon Shafts for Irons

SteelFiber Golf Shafts have introduced an entirely new technology in carbon and steel shafts. Players no longer have to choose between 100% carbon or 100% steel. SteelFiber combines the power of carbon with the stability of steel.

Our Experience with Steelfiber in Club Fitting

Steelfiber was one of the first manufacturers to concentrate on graphite steel composite and has built up a corresponding leading position. However, many other manufacturers are now also active in this segment. And one thing must be said quite clearly: some of these manufacturers simply skip the step of working with steel, but simply develop their carbon fibres accordingly. A good example of this is KBS TGI, a pure graphite shaft, which can be very hard, but also light.

The big advantage of Steelfiber shafts is exactly this: it is possible to use a light shaft with a relatively stiff flex. To put this into perspective:

The Steelfiber i95S is stiffer than the Nippon Modus 120 X and almost as stiff as the Project X 6.0 - both shafts are also played on the Tour and are considered typical steel stiff shafts.
The KBS TGI 80 is again stiffer than the Steelfiber i95 R - although it is a pure graphite shaft.

In short: Steelfiber shafts can be very stiff even with little weight, but pure graphite shafts can also be very stiff. It is therefore not a patented recipe of Steelfiber and nothing that can only be achieved with the steel-graphite mixture.

Our experiences in fittings show one thing above all: Steelfiber shafts should not be underestimated in their stiffness. Even a Steelfiber i80 R is already relatively stiff. Do not make the mistake of inferring the stiffness from the specified flex and shaft weight - you could be in for a nasty surprise with Steelfiber without proper consultation. If you decide on a Steelfiber shaft, it is essential that you clarify the flex in advance.

By the way, you can find a detailed overview of the respective degrees of stiffness in comparison to other shafts here in our large iron shaft comparison.


For players with a slower swing speed who want to increase the ball flight and gain as much distance as possible.


The SteelFiber i80 gives a player all the benefits of a 100% golf graphite shaft, control and consistency. The special feature of this shaft is that the torsion is very low.


With more PGA Tour wins than any other golf graphite iron shaft in history, the SteelFiber i95 is the perfect transition to a lighter shaft that allows a player to improve distance and vibration reduction while maintaining accurate and constant distance control.


Players looking for weight reduction in their golf shafts will choose the SteelFiber i110 to take advantage of the accuracy, consistency and vibration damping of the SteelFiber shaft while maintaining steel shaft characteristics in a similar ball flight. The hardness of the SteelFiber i110 in Regular is similar to that of a steel shaft.


The SteelFiber i125 is generally chosen by players who prefer a high shaft weight but want to benefit from the vibration damping properties of a graphite shaft. Only available in Stiff, the hardness is comparable to a steel shaft.

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