The Aerotech Steelfiber fc115 .370 F4-S sits at the heavy end of graphite iron shafts at 4.06 oz (115 g), while its 2.9° torque is on the lower side. Its mid launch / mid spin flight profile and stable / control-oriented character make it best suited to medium or medium-fast tempos.
Iron shaft specifications
Aerotech · Steelfiber fc115 .370 F4-S · Iron Shaft
Material: GraphiteFlex: F4-SWeight class: Midweight (100-119.9 g)Flight: Mid launch / Mid spinTip: Parallel tip
4.06 ozWeight
2.9°Torque
F4-SFlex
VariableLaunch
Material-matched benchmarks
How this shaft compares
Numeric comparisons use graphite iron shafts in this database.
Weight
Very high
4.06 oz
Weight is very high among graphite iron shafts in this database.
Torque
Below average
2.9°
Torque is below average among graphite iron shafts with published numeric torque.
Balance point
Very low
50.5%
Balance point is very low among comparable graphite iron shafts.
At a glance
Shaft profile
MaterialGraphite
TipParallel tip
LaunchVariable
SpinMid
StabilityStable / control-oriented
Tempo fitBest suited to medium or medium-fast tempos
Overview
Model information
| Manufacturer | Aerotech |
|---|---|
| Model | Steelfiber fc115 .370 F4-S |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | AT0031I |
| MPF rating | 4C1H |
Full specifications
Technical details
Weight & flex
Weight4.06 oz (115 g)
Weight classMidweight (100-119.9 g)
FlexF4-S
Torque2.9°
Bend pointvariable
Kick pointMid
Tip stiffnessvariable
Tip flexmedium
Butt flexmedium
Balance point50.5%
Build & dimensions
MaterialGraphite
Tip typeParallel tip
Tip diameter0.37 in (9.4 mm)
Butt diameter0.6 in (15.2 mm)
Shaft length41 in (104.1 cm)
Length rangeSingle-length blank; tip-trim by club
Parallel tip length5.5 in (14 cm)
Club rangeIrons, typically 3i-PW (trimmed from parallel blank)
FinishPainted composite / graphite finish (varies by model)
Flight & feel
LaunchVariable
SpinMid
Trajectory / spin profileMid launch / Mid spin
Stability profileStable / control-oriented
Launch assistanceNeutral launch assistance
Feel profileVibration-damping graphite feel, stable through impact
Relative weight positionVery high for graphite iron shafts
Relative torque positionBelow average for graphite iron shafts
Player fit
Tempo fitBest suited to medium or medium-fast tempos
Transition fitSuited to moderate-to-firm transitions
Control vs speed biasBalanced speed and control
Long-iron playabilityNeutral long-iron playability
Short-iron controlGood short-iron control
Likely swing-speed fitModerate iron swings
Target playerStronger players and quicker tempos seeking heavier feel, control and stability
Golfer fit summaryBalanced speed and control; best suited to medium or medium-fast tempos; mid launch / mid spin.