Aerotech SteelFiber Shaft Guide: i-Series, fc, Hybrid and Putter

What the steel fiber does

A SteelFiber shaft starts as a filament-wound carbon core. That is where the light weight and the vibration damping come from. Around it, Aerotech winds a mesh of stainless steel filament, each strand about 8 microns across, roughly a tenth the width of a hair, and by True Temper's count more than 59 miles of it per shaft. Steel is about five times as dense as carbon, so a thin layer on the outside adds a lot of mass at the surface of the tube. That moves the shaft wall's center of gravity outward, raises its resistance to twisting, and gives the shaft the hoop strength a steel shaft has and a plain graphite shaft does not. The result is a shaft that weighs what graphite weighs, holds its shape through impact the way steel does, and feels smoother than either on a mishit.

i-Series: the original SteelFiber

The number is the weight in grams. The i95 is the one most tour players use and the one we sell most of; the i110 and i125 are for players coming out of heavy steel who want nothing to change but the vibration; the i55 through i80 are for the player who wants to lighten the set. The taper-tip "cw" versions are constant weight and made to length for each iron, so there is no tip trimming. The parallel version is one 41" shaft that you trim per iron.

Constant-weight taper shafts come one per iron with the butt left long; see how tapered tip shaft lengths work. Collections: .355" taper tip, .370" parallel tip, 8-shaft sets. Torque figures are the ones True Temper publishes; blank cells are models it has not published a figure for.

fc Flight Control: more height where you need it

The fc is the same SteelFiber construction with a softer, progressive tip section. In the mid and long irons it adds launch; in the 8-iron through wedges it stiffens back to the standard SteelFiber profile so the scoring clubs do not balloon. It is the pick for the player who likes the feel of an i-series but cannot get a 4- or 5-iron in the air with it. The parallel fc comes in 70, 80 and 90 weight classes; the taper fc comes in 90 and 115, both constant weight.

Full line: fc collection. The 115 is the heavier of the two taper fc profiles and the easier move for a player coming out of full-weight steel who wants more height.

Hybrid, fairway and putter

SteelFiber's idea of sitting between steel irons and graphite woods is exactly what a hybrid asks for, so the hls hybrid shafts are the ones we fit most for a player with steel irons and graphite woods who wants the hybrid to feel like neither extreme. The hfs780 does the same job in a fairway wood. The putter shaft is built stiffer than a steel putter shaft to limit movement in the stroke.

Which SteelFiber to start with

Still not sure? The 2-minute shaft quiz narrows it by speed and tempo, and our graphite vs steel iron shafts page covers the broader decision.

Aerotech SteelFiber shaft spec table

Every Aerotech SteelFiber shaft on this page in one list: tip, launch and spin, the flexes we stock, weight and torque, from the maker's spec charts and our product pages. A blank cell is a figure the maker has not published. Click a model to open it.