A shaft spec sheet looks like an engineering document. Columns, units, decimal places. It is not one. It is a marketing document with engineering-shaped columns, produced by a company with no external body checking any of it, and the columns are not equally trustworthy. Here is how to read one, worst column to best.
Torque: the column with no rules at all
Start here, because it is the column people compare across brands and the one that least supports it.
Plugged In Golf's explainer on torque is blunt about the state of play: "there are virtually no industry standards in shafts. Measuring torque is no exception." The basic procedure is the same everywhere — clamp the butt, apply a force at the tip, measure the twist in degrees — but "what can vary are the size of the clamp, the distance between the clamp and the force, and the amount of force used."
Three free variables. A 3.2° from one house and a 3.2° from another are not the same measurement, and nobody has to tell you which protocol produced either.
Then it gets worse. True Temper's own Dynamic Gold page publishes torque as a single word: "Low." Not a figure. The most-played iron shaft in the history of the professional game does not give you a number for the spec you would most want to compare.
Where torque is useful is inside one family, where the protocol is at least constant. Graphite Design's Tour AD EK runs from 5.3° in the lightest model down to 2.6° in the heaviest. Fujikura's VENTUS TR Red goes from 3.8° at 60 grams to 2.5° at 96 grams. Read down a single maker's column and torque is essentially a weight proxy with useful resolution. Read across two makers' columns and you are comparing rumours.
Launch and spin ratings: the decorative column
Every sheet has one. It is almost always relative to that maker's own line, not to the field — a "mid launch" from a house whose whole catalogue is low-launch is not a mid-launch shaft in absolute terms, and no sheet says so.
It also does not always survive measurement. Graphite Design publishes the Tour AD EK as mid/high launch with controlled mid/low spin. Plugged In Golf tested it and reported "mid/low spin with the launch closer to mid/low than mid/high." The spin rating held. The launch rating did not.
That is not fraud. It is what an in-house rating looks like when an outside tester with a different swing puts a launch monitor behind it. Treat this column as a direction, never as a number.
Weight: the most honest column, with one trap
Weight is a mass on a scale and it is the column you can mostly believe. Nippon publishes the ZELOS 7 at 73.5 g in R2, 74.0 g in R and 77.5 g in S — half-gram resolution, plainly stated.
The trap is family versus model. Graphite Design lists Tour AD EK's S flex at 50 to 66.5 grams, because "S" exists across every weight class in the family. That row is not a shaft. It is a range covering several shafts. If you write down "EK, S flex" you have written down nothing; you need the model number that fixes the weight class.
The second, smaller trap: this is the raw shaft's weight. What ends up in your club has been trimmed, and what you swing includes a grip, tape and epoxy.
Flex: read the number of columns, not the letters
The flex chapter of this series covers why the letter is not a specification. On a spec sheet, the useful signal is different: how many flexes the maker offers and what they are called. Tour AD EK is listed in R2, R1, S, X and TX. A five-step ladder inside one family tells you more about that family's intended range than any single letter tells you about the shaft.
The profile numbers, when you are lucky enough to get them
The best column on any shaft spec sheet is the one most makers do not print. Graphite Design rates Tour AD EK 4-3-4 butt-to-tip — stiff butt, firm middle, stiff tip — against Tour AD DI at 2-2-4. An ordinal scale, within one brand, across the length of the shaft.
It is not an EI curve, but it is the same idea with the resolution turned down, and it is checkable: Plugged In Golf's tester concluded Graphite Design "nailed it with their number rating," finding the kick sat in the middle of the shaft exactly where a 3 in the mid-section predicts. When a maker publishes a profile and an independent tester confirms it, that is the strongest thing a spec sheet can do.
The columns that quietly go missing
Butt diameter. Tour AD EK's is published as a range, .602" to .612", across the family. That is a real consequence — a .010" swing in butt diameter changes how a given grip core sits and therefore your effective grip size. Fujikura's VENTUS TR table gives tip diameters (.604" to .622" across models) without a matching butt column on the page.
Frequency. Never published, and after reading the CPM chapter you know why: it depends on the clamp, the head weight and the finished length, none of which the maker controls.
The full bend profile. Almost nobody publishes EI data. The three-number rating above is the generous end of the market.
What no spec sheet can tell you
Both Tour AD EK and VENTUS TR ship at 46 inches raw with a 3.0-inch parallel tip section. Everything that happens after that — how much came off the tip, what hosel it went into, what it was butt-trimmed to — is invisible on the sheet and changes the shaft more than most of the columns on it. The spec sheet describes a part. You play an assembly.
Six questions to ask any spec sheet
- Is this row a model or a family? If a weight or torque is printed as a range, it is a family.
- Is the torque a number or an adjective — and would you accept an adjective from anyone else?
- Are the launch and spin ratings relative to this brand's own line? They always are.
- Is there a butt diameter, and is it a range? It affects your grip.
- Does the information density match the price tier? A shaft sold at the top premium tier with a one-word torque spec is telling you something.
- What did somebody outside the company measure? This is the only question that has ever settled anything.
Then go measure it yourself
The final check is not on paper. Book a bay, put the shaft behind a launch monitor and look at the two things a spec sheet is worst at describing: your peak height and your dispersion. Twenty balls is enough to see whether "mid/high launch" is mid/high for you — which is the only definition of the phrase that has ever mattered.
From the glossary
Related reading: The Clubhouse Guide to Golf Shafts · Frequency and CPM: What the Number Actually Measures · Bend Profile and the EI Curve: Under the Kick Point · Raw vs. Cut: The Shaft You Buy Is Not the Shaft You Play
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