The FST Pro 115 Stepless Senior / A sits near the typical steel iron-shaft weight range at 4.06 oz (115 g), while its 3° torque is on the higher side. Its high launch / mid-high spin flight profile and stable / control-oriented character make it best suited to medium or medium-fast tempos.
Iron shaft specifications
FST · Pro 115 Stepless Senior / A · Iron Shaft
Material: SteelFlex: Senior / AWeight class: Midweight (100-119.9 g)Flight: High launch / Mid-high spinTip: Taper tip
4.06 ozWeight
3°Torque
Senior / AFlex
HighLaunch
Material-matched benchmarks
How this shaft compares
Numeric comparisons use steel iron shafts in this database.
Weight
Typical
4.06 oz
Weight is typical 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
LaunchHigh
SpinMid-High
StabilityStable / control-oriented
Tempo fitBest suited to medium or medium-fast tempos
Overview
Model information
| Manufacturer | FST |
|---|---|
| Model | Pro 115 Stepless Senior / A |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | FS0087 |
| MPF rating | 2D3H |
Full specifications
Technical details
Weight & flex
Weight4.06 oz (115 g)
Weight classMidweight (100-119.9 g)
FlexSenior / A
Torque3°
Bend pointlow
Kick pointLow / tip
Tip stiffnesssoft
Tip flexsoft
Butt flexsoft
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
Flight & feel
LaunchHigh
SpinMid-High
Trajectory / spin profileHigh launch / Mid-high spin
Stability profileStable / control-oriented
Launch assistanceStrong launch assistance
Feel profileCrisp steel feedback, stable through impact
Relative weight positionTypical for steel iron shafts
Relative torque positionVery high for steel iron shafts
Player fit
Tempo fitBest suited to medium or medium-fast tempos
Transition fitSuited to moderate-to-firm transitions
Control vs speed biasSlightly speed biased
Long-iron playabilityGood long-iron playability
Short-iron controlGood short-iron control
Likely swing-speed fitSlower to moderate iron swings
Target playerStronger players and quicker tempos seeking heavier feel, control and stability
Golfer fit summarySlightly speed biased; best suited to medium or medium-fast tempos; high launch / mid-high spin.