Read the specification before the sales pitch

Golf Shaft Weight and Flex Are Different Decisions

A model number, a weight in grams and a flex letter describe different parts of a shaft specification. Read them together, then compare complete clubs. One label cannot tell you which build will fit your swing.

Development

Gear & Equipment · Updated October 24, 2026

The short version

  • A shaft’s model class is not necessarily its listed weight: Mitsubishi’s C6 BLACK Iron 60 R is listed at 69 g.
  • Flex and weight are separate fields. In that family, the 60 R and 70 R share the R label but have different listed weights.
  • Record the head, loft, playing length, grip and finished build when testing. Catalog shaft grams are not the total weight of the club.

Three shaft options, read without shortcuts

Mitsubishi C6 BLACK Iron · manufacturer specifications

“60” is the model label.
69 g is the listed weight.

C6 BLACK Iron 60

67 g

Flex label
R2
Listed length
42 in
Tip diameter
.370 in

C6 BLACK Iron 60

69 g

Flex label
R
Listed length
42 in
Tip diameter
.370 in

C6 BLACK Iron 70

78 g

Flex label
R
Listed length
42 in
Tip diameter
.370 in

Same model class, different flex: the 60 R2 and 60 R are listed at 67 g and 69 g.

Same flex, different weight: the 60 R and 70 R are both R, but their listed weights differ by 9 g.

These are catalog specifications for the listed shaft, not measurements of finished clubs. Trimming and the rest of the build must be recorded separately. No shot test or fitting recommendation is implied.

Separate the model, mass and flex label

In the comparison, “60” and “70” identify model classes. The manufacturer’s GMS column gives 67, 69 or 78 grams for the three specific options. R2 and R occupy a different column. Treating a “60” as exactly 60 grams would get this table wrong before a club was even built.

The table also lists length, tip and butt dimensions, torque and kick point. Those fields help identify the product, but they do not describe how you personally strike a ball with it. Mitsubishi describes this family as mid launch and mid spin; that is the manufacturer’s characterization, not a measured result from our testing.

Compare the full model and version when asking for regular versus stiff. A shared letter is not enough evidence that two different shaft models have equivalent profiles or will feel the same.

A shaft specification is not a finished-club specification

The C6 table lists a 42-inch shaft and separate, club-specific tip-trim instructions. Do not treat the table’s length as the playing length of an assembled iron or carry its catalog mass into a claim about finished-club weight.

Once the club is built, the head, shaft after trimming, grip and other components contribute to the result. Ask the fitter or clubmaker to document the actual playing length and finished weight rather than estimating them from a label.

This is a specification-reading guide, not a cutting instruction. Tip compatibility and model-specific trimming need to be verified for the exact head and shaft before assembly.

Regular versus stiff; steel versus graphite

Both comparisons need the exact model. On Titleist’s current T100 page, the listed steel AMT Tour White options include R300, S300 and X100; its graphite MCA MMT AMC Blue options include R and S. Material and flex are separate choices even within one manufacturer’s club offering.

The same page publishes weight ranges for those shaft options. A range across an iron-shaft set is not the weight of one completed seven-iron. Confirm which club, shaft and measurement basis you are comparing before using the number.

Neither “graphite” nor “stiff” is a verdict on suitability. Use the material and flex labels to identify candidates, then evaluate contact, carry consistency, dispersion and comfort in the actual build. This guide does not assign a flex from age, a single swing-speed number or a distance claim.

Make the comparison reproducible

  1. Write down the complete candidate. Head model and loft, shaft model and flex, playing length and grip.
  2. Record what changed. If head, loft and length also changed, do not attribute every shot difference to shaft flex.
  3. Use a comparable test. The same ball and conditions make the record easier to interpret. Ask the fitter how mishits and outliers are handled.
  4. Keep the ordinary shots. Compare a repeatable pattern rather than the longest single strike.
  5. Get the build and price in writing. Confirm exactly what would be ordered before treating a demo as the final specification.

There are no original shot results hidden behind the catalog numbers here. The next useful evidence is a recorded fitting comparison, including the player’s observations and the fitter’s interpretation.

Before booking, compare what fitting appointments include. If your purchase decision concerns the bottom of the bag, the wedge-gap comparison starts from the pitching wedge you actually own.

Your next move

Read the complete specification

Compare the exact C6 BLACK Iron models and manufacturer trimming information.

Read the complete specification(Official source), opens in a new tab

Frequently asked questions

Is a 60-gram shaft always softer than a 70-gram shaft?
Weight and flex are separate specifications. Mitsubishi’s C6 BLACK Iron 60 R and 70 R both carry an R label, but list different weights. The exact model and complete build still need to be compared.
Does the number in a shaft’s name equal its weight?
Not necessarily. The C6 BLACK Iron 60 R is listed at 69 grams. Read the manufacturer’s weight column for the exact model rather than treating a model class as a measured weight.

Keep reading

Sources and review

What it covers
Mitsubishi C6 BLACK Iron specifications and Titleist T100 shaft-option tables checked October 24, 2026. Catalog comparison, not an original hitting test.
Checked

What this page cannot tell you

  • No finished clubs were weighed and no shots were tested for this guide. Manufacturer tables do not establish individual fit.