The UST Mamiya DART V 120 X-Stiff sits at the heavy end of graphite iron shafts at 4.23–4.3 oz (120–122 g). Its mid-low launch / low-mid spin flight profile and very stable / low-twist character make it best suited to medium-fast or fast tempos.
Iron shaft specifications
UST Mamiya · DART V 120 X-Stiff · Iron Shaft
Material: Carbon Fiber / GraphiteFlex: X-StiffWeight class: Tour-heavy (120+ g)Flight: Mid-Low launch / Low-Mid spinTip: Taper tip
4.27 ozWeight
1.5-1.8Torque
X-StiffFlex
Mid-LowLaunch
Material-matched benchmarks
How this shaft compares
Numeric comparisons use graphite iron shafts in this database.
Weight
Very high
4.27 oz
Weight is very high among graphite iron shafts in this database.
At a glance
Shaft profile
MaterialCarbon Fiber / Graphite
TipTaper tip
LaunchMid-Low
SpinLow-Mid
StabilityVery stable / low-twist
Tempo fitBest suited to medium-fast or fast tempos
Overview
Model information
| Manufacturer | UST Mamiya |
|---|---|
| Model | DART V 120 X-Stiff |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | Not published |
| MPF rating | Not published |
Full specifications
Technical details
Weight & flex
Weight4.23–4.3 oz (120–122 g)
Weight classTour-heavy (120+ g)
FlexX-Stiff
Torque1.5-1.8
Bend pointMid-high
Kick pointMid to high
Tip stiffnessFirm / player-oriented
Build & dimensions
MaterialCarbon Fiber / Graphite
Tip typeTaper tip
Tip diameter0.355 in (9 mm)
Butt diameter0.6 in (15.2 mm)
Shaft lengthDiscrete lengths
Length range37-41 in (94-104.1 cm)
Club range2-iron through wedge
FinishDART V graphic finish
Flight & feel
LaunchMid-Low
SpinLow-Mid
Trajectory / spin profileMid-Low launch / Low-Mid spin
Stability profileVery stable / low-twist
Launch assistanceTrajectory-control biased; limited launch assistance
Feel profileVibration-damping graphite feel, very firm/stable through impact, substantial tour-weight feel
Relative weight positionVery high for graphite iron shafts
Relative torque positionTorque is not normally published for this steel model
Player fit
Tempo fitBest suited to medium-fast or fast tempos
Transition fitHandles aggressive transitions well
Control vs speed biasControl / consistency biased
Long-iron playabilityDemanding in long irons; better for stronger ball-strikers
Short-iron controlStrong short-iron and wedge control bias
Likely swing-speed fitFaster iron swings / stronger players
Target playerPlayers seeking low torque, tight dispersion and graphite vibration damping
Golfer fit summaryControl / consistency biased; best suited to medium-fast or fast tempos; mid-low launch / mid spin.