The Project X .370 5.5 R+ sits near the typical steel iron-shaft weight range at 4.06 oz (115 g), while its 1.9° torque is on the lower side. Its low launch / mid spin flight profile and very stable / low-twist character make it best suited to medium or medium-fast tempos.
Iron shaft specifications
Project X · .370 5.5 R+ · Iron Shaft
Material: SteelFlex: 5.5 R+Weight class: Midweight (100-119.9 g)Flight: Low launch / Mid spinTip: Parallel tip
4.06 ozWeight
1.9°Torque
5.5 R+Flex
LowLaunch
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
Below average
1.9°
Torque is below average 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
TipParallel tip
LaunchLow
SpinLow-Mid
StabilityVery stable / low-twist
Tempo fitBest suited to medium or medium-fast tempos
Overview
Model information
| Manufacturer | Project X |
|---|---|
| Model | .370 5.5 R+ |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | TT0118 |
| MPF rating | 3.5C1H |
Full specifications
Technical details
Weight & flex
Weight4.06 oz (115 g)
Weight classMidweight (100-119.9 g)
Flex5.5 R+
Torque1.9°
Bend pointhigh
Kick pointHigh
Tip stiffnessstiff
Tip flexfirm
Butt flexmedium
Balance point51.5%
Build & dimensions
MaterialSteel
Tip typeParallel tip
Tip diameter0.37 in (9.4 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 rangeIrons, typically 3i-PW (trimmed from parallel blank)
FinishChrome / polished steel (family-based)
Flight & feel
LaunchLow
SpinLow-Mid
Trajectory / spin profileLow launch / Mid spin
Stability profileVery stable / low-twist
Launch assistanceTrajectory-control biased; limited launch assistance
Feel profileCrisp steel feedback, very firm/stable through impact
Relative weight positionTypical for steel iron shafts
Relative torque positionBelow average 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 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 fitModerate iron swings
Target playerStronger players and quicker tempos seeking heavier feel, control and stability
Golfer fit summaryControl / consistency biased; best suited to medium or medium-fast tempos; low launch / mid spin.