autoFlex — Flex Line · The Original

autoFlex Original

Love the feel of your driver? Carry it through the bag.

When a driver feels right, you want to find that connection in your other clubs. Introduced in 2020, autoFlex Original spans driver, wood, hybrid, iron and putter. It is the starting point for building a bag around a familiar autoFlex feel.

Full specifications ↓

Line

Driver · Wood · Hybrid · Iron · Putter

Driver specs

SF305X–SF505XX · 5 specs · 70–120 mph

Made in

100% Made in Korea. Designed and built at HQ, no OEM

New

Iron SF305 · April 2026 · Pink only

The Story

Where autoFlex began

Original introduced our approach to a lighter, softer shaft. That idea remains at the heart of the autoFlex family.

A range across the bag

Choose from driver, wood, hybrid, iron and putter options. Each club has its own role, with weights and specifications to match.

One feel across your bag

The feel you enjoy need not stop at the driver. Explore the Original range and the pleasure of carrying a familiar response into your other clubs.

Specifications

CPM is listed as a factual figure. Fitting is guided by swing speed and tempo, never by CPM comparison.

Start with the recommended head speed, then compare total club weight, feel and ball flight with your chosen head. Your tempo and transition also help guide the fitting.

Use the head-speed range as a starting point, then confirm your choice through fitting and swing tempo.

Driver — 45"

Spec	Weight (g)	CPM	Your head speed (mph)	Swing weight
SF305X	41	170	70–90	C7.0–C9.0
SF405	45	190	85–100	C9.0–D0.0
SF505	50	210	95–105	D0.0–D1.0
SF505X	55	215	100–110	D1.0–D1.5
SF505XX	57	220	110–120	D1.5–D2.0

SF305X

Weight (g)

CPM

170

Your head speed (mph)

70–90

Swing weight

C7.0–C9.0

SF405

Weight (g)

CPM

190

Your head speed (mph)

85–100

Swing weight

C9.0–D0.0

SF505

Weight (g)

CPM

210

Your head speed (mph)

95–105

Swing weight

D0.0–D1.0

SF505X

Weight (g)

CPM

215

Your head speed (mph)

100–110

Swing weight

D1.0–D1.5

SF505XX

Weight (g)

CPM

220

Your head speed (mph)

110–120

Swing weight

D1.5–D2.0

Spec	Weight (g)
SF405	43
SF405X	45
SF505	50
SF505X	55
SF505XX	57

Spec	Weight (g)
SF405	49
SF405X	51
SF505	55
SF505X	57

Spec	Weight (g)	CPM
SF305NEW	47	220
SF405	50	230
SF505	53	240

Putter — 34" · 36"

One autoFlex putter shaft, available in Original and Flex One designs. Both designs share the same specifications.

Length	Weight	Tip	Butt
34"	approx. 110 g	9.45mm (0.370")	15.4mm (0.606")
36"	approx. 110 g	9.45mm (0.370")	15.65mm (0.616")

34"approx. 110 g

Tip

9.45mm (0.370")

Butt

15.4mm (0.606")

36"approx. 110 g

Tip

9.45mm (0.370")

Butt

15.65mm (0.616")

Tip measured 0.25" from the tip end; butt measured 1" from the butt end.

Choose your design — Original pink / Flex One Korean cloud pattern

Steel's weight, carbon's softness — a 110g balance that strokes like steel, with carbon's vibration damping for a softer touch
Unwavering roll — twist control at impact keeps the face from opening or closing, so the ball starts on your line
If you already play autoFlex, finish the bag with the same feel

Compatibility — check before you buy

Due to its carbon construction, this shaft fits hosel-insert putters only (plumber neck · slant neck, 0.370"/9.45mm hosel bore). It cannot be installed on over-hosel or bent-neck putters. Hosel bores vary by head maker and model year — have a fitting shop confirm 0.370" compatibility before purchase. Forced installation can crack the carbon.

Different clubs. A familiar feel.

Carry the autoFlex experience from driver through woods and irons, all the way to the putter on the green. Build a bag around the way you like to play.