The FST 125 X-Stiff is heavier than average for steel iron shafts at 4.41 oz (125 g), while its 3° torque is on the higher side. Its mid launch / mid spin flight profile and stable / control-oriented character make it best suited to medium-fast or fast tempos.
Iron shaft specifications
FST · 125 X-Stiff · Iron Shaft
Material: SteelFlex: X-StiffWeight class: Tour-heavy (120+ g)Flight: Mid launch / Mid spinTip: Taper tip
4.41 ozWeight
3°Torque
X-StiffFlex
MidLaunch
Material-matched benchmarks
How this shaft compares
Numeric comparisons use steel iron shafts in this database.
Weight
Above average
4.41 oz
Weight is above average among steel iron shafts in this database.
Torque
Very high
3°
Torque is very high among steel iron shafts with published numeric torque.
Balance point
Very low
51.5%
Balance point is very low among comparable steel iron shafts.
At a glance
Shaft profile
MaterialSteel
TipTaper tip
LaunchMid
SpinMid
StabilityStable / control-oriented
Tempo fitBest suited to medium-fast or fast tempos
Overview
Model information
| Manufacturer | FST |
|---|---|
| Model | 125 X-Stiff |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | FS0014 |
| MPF rating | 5C1H |
Full specifications
Technical details
Weight & flex
Weight4.41 oz (125 g)
Weight classTour-heavy (120+ g)
FlexX-Stiff
Torque3°
Bend pointhigh
Kick pointHigh
Tip stiffnessmedium
Tip flexmedium
Butt flexfirm
Balance point51.5%
Build & dimensions
MaterialSteel
Tip typeTaper tip
Tip diameter0.355 in (9 mm)
Butt diameter0.6 in (15.2 mm)
Shaft lengthVaries by club
Length range41.0-37.0 (derived discrete set) in (104.1-94 (derived discrete set) cm)
Parallel tip lengthN/A — taper-tip design
Club rangeIron set, typically 2i/3i-PW
FinishChrome / polished steel (family-based)
Flight & feel
LaunchMid
SpinMid
Trajectory / spin profileMid launch / Mid spin
Stability profileStable / control-oriented
Launch assistanceNeutral launch assistance
Feel profileCrisp steel feedback, stable through impact, substantial tour-weight feel
Relative weight positionAbove average for steel iron shafts
Relative torque positionVery high for steel iron shafts
Player fit
Tempo fitBest suited to medium-fast or fast tempos
Transition fitHandles aggressive transitions well
Control vs speed biasControl / consistency biased
Long-iron playabilityNeutral long-iron playability
Short-iron controlGood short-iron control
Likely swing-speed fitFaster iron swings / stronger players
Target playerStronger players and quicker tempos seeking heavier feel, control and stability
Golfer fit summaryControl / consistency biased; best suited to medium-fast or fast tempos; mid launch / mid spin.