Project X LZ Shaft Chart: Weights, Flex Codes & LZ vs Project X

The quick answer: Project X LZ is the lighter, smoother-loading version of the Project X steel iron shaft, and in LZ weight climbs with flex: 5.0 is about 110g, 5.5 about 115g, 6.0 about 120g and 6.5 about 125g. Launch and spin are mid — noticeably higher than standard Project X, which is the whole point of the line. There is no 4.0 and no 7.0 in LZ. The full chart is below.

LZ stands for Loading Zone, and the name describes what the shaft does: the profile is designed with defined zones that load more readily than the famously stout standard Project X, so you get Project X control without needing a Project X transition to earn it. True Temper's own description is "the proven performance of Project X with a lighter design for effortless speed," aimed at players who want the feel and control of Project X with a smoother tempo.

That makes LZ the single most mis-bought shaft in the Project X range, in both directions. Players who were told "you are a 6.0" in standard Project X are often a 6.0 in LZ too — but the ball flies higher, which is either the fix they needed or a surprise they did not want. This chart gives the weights, the flex codes and an honest LZ-versus-standard comparison. Weights match True Temper's published specs and the database that powers our club grader. True Temper does not publish torque for its steel iron shafts, so none is invented here.

Project X LZ Shaft Chart: Weight by Flex

Weight tracking flex is the LZ design, not a coincidence. You cannot order a light 6.5 or a heavy 5.0 — stepping up a flex steps you up roughly 5 grams. That is the same convention KBS uses in its steel irons and the opposite of how graphite wood shafts like Denali work, where flex and weight are chosen independently.

LZ is a taper-tip (0.355") shaft supplied in per-iron lengths, so a set arrives as eight individually-trimmed shafts rather than one parallel blank you cut down. Project X LZ Blackout is the same shaft in a blackout finish, offered in 5.5, 6.0 and 6.5 — a cosmetic option, not a different profile.

What Swing Speed Each LZ Flex Fits

LZ uses the standard Project X numeric codes. If you want the full system across every Project X model, the Project X shaft selector chart is the canonical explainer — this table is just the LZ slice of it.

Because irons swing roughly 10–15 mph slower than a driver for the same golfer, these are driver speeds used as the reference, which is how nearly every published flex chart works:

These bands follow our brand-neutral swing speed shaft flex chart. The 90–99 mph stretch is where the number alone stops deciding for you: a smooth, gradual transition can stay at 5.5, a quick and aggressive one goes to 6.0. Because LZ weight is bolted to flex, that decision also costs or saves you five grams — which for a lot of players is the bigger half of the choice.

If an LZ is already in your set, add your clubs in the app with the exact printing. The grader scores flex and weight progression across the whole set by playing spec, which is where a mixed bag — LZ irons against a much lighter graphite wood shaft — usually shows up as a problem.

LZ in Context

Project X LZ vs standard Project X

Same family, different jobs. Standard Project X is the low-launch, low-spin, low-torque shaft that built the brand's reputation — stout, penetrating, and demanding of a strong transition. LZ keeps the control but loads more readily and flies mid rather than low. On weight the two are closer than the marketing implies: standard Project X runs 113g at 5.0, 118g at 5.5, 121g at 6.0 and 125g at 6.5, so LZ saves about three grams at the softer codes, one gram at 6.0, and nothing at all at 6.5. Buy LZ for the bend profile, not for the weight. If you tried standard Project X and found it unworkably stiff or too low, LZ is the in-family answer before you leave the brand.

Project X LZ vs Project X IO

IO is the lighter one again. IO was made in three flexes, 105g at 5.5 up to 115g at 6.5 — a full ten grams under LZ at every code — and launched a touch higher still in the long irons. The practical split: LZ if you want Project X control with normal steel weight, IO if you need to save weight through the set without dropping to graphite. IO has been dropped from True Temper's current catalogue, so LZ is the shaft to specify on a new build.

LZ and the rest of the bag

An LZ 6.0 set at 120g is a fairly standard steel iron weight, so it pairs naturally with a 60–70g graphite wood shaft and an 80–90g hybrid shaft. The progression trap is at the wedges: many players carry LZ through the pitching wedge and then add a wedge with a heavier stock shaft, which creates a weight jump exactly where feel matters most. Check the gap wedge against the pitching wedge before you blame your technique.

Project X LZ Blackout

The blackout-finish version of the same shaft, offered in 5.5, 6.0 and 6.5 on the same 0.355" taper tip. True Temper describes it as the same performance-driven design with a premium finish. Treat it as a cosmetic choice: if you are matching an existing set, a Blackout 6.0 and a standard LZ 6.0 play the same, and the only fitting consideration is that the finish is harder to find in every length if you need a single replacement later.

Is LZ Actually Lighter? The Number That Matters

"Lighter" in LZ marketing means lighter than standard Project X, not light in absolute terms. At 110–125g, LZ sits right in the middle of the steel iron shaft market — heavier than KBS Tour Lite (95–105g), about the same as KBS Tour (110–130g), and a long way above any graphite iron shaft. If you came here looking for a genuinely lightweight iron shaft because your set feels heavy at the end of a round, LZ is probably not far enough, and the honest answer is a lightweight steel or a composite.

The more useful way to read the LZ weight table is as a progression check. Five grams per flex step is small enough that most players cannot feel it in isolation, but it does mean a mixed set — some clubs reshafted at 6.0, others still 5.5 — carries a real weight inconsistency on top of the flex one. That is one of the eight factors our grader scores, and it is the single most common finding in sets that have been repaired piecemeal over the years.

Frequently asked questions

What does LZ stand for on a Project X shaft?

LZ stands for Loading Zone. The profile is built with zones designed to load more readily than standard Project X, which is what gives the shaft its smoother feel and mid launch while keeping Project X control.

How much does a Project X LZ 6.0 weigh?

About 120 grams. In LZ, weight tracks flex: 5.0 is roughly 110g, 5.5 is 115g, 6.0 is 120g and 6.5 is 125g. You cannot order a light 6.5 or a heavy 5.0 in this line.

What swing speed is Project X LZ 6.0 for?

Roughly 95 to 110 mph of driver speed, the same as a standard stiff flex. LZ 5.0 suits about 75 to 95 mph and LZ 6.5 suits over 110 mph. Between about 90 and 99 mph, tempo decides between 5.5 and 6.0 more reliably than the speed number does.

What is the difference between Project X LZ and Project X?

Standard Project X is low launch, low spin and very stout. LZ loads more readily and launches and spins mid. The weight difference is smaller than most people expect: about three grams at 5.0 and 5.5, one gram at 6.0 and none at 6.5. Both deliver Project X control, but LZ suits a smoother tempo and a player who needs more height.

Is Project X LZ good for mid handicappers?

It can be, and more easily than standard Project X. The mid launch and readier loading make it far more playable for a mid handicapper with a moderate transition than the standard profile, provided the flex code is right. At 110 to 125 grams it is still a full-weight steel shaft, so it suits players who want control rather than maximum ease.

What is Project X LZ Blackout?

The same Project X LZ shaft in a blackout finish, offered in 5.5, 6.0 and 6.5. It is a cosmetic variant, not a different bend profile, so it plays identically to the standard version in the same flex code.

Related reading

• Project X Shaft Selector Chart: Flex by Swing Speed — The canonical explainer for the whole 5.0 / 5.5 / 6.0 / 6.5 system, across every Project X model.
• Project X Shaft Weights and Specs — Standard Project X steel weights side by side with LZ, so you can see the gap at each code.
• Golf Swing Speed Chart: Shaft Flex by Club Head Speed — The brand-neutral flex chart the LZ bands above are built on.
• Golf Shaft Weight Guide — Where a 110-125g steel iron shaft sits against the rest of the market.

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