The shaft that changed the game.

Autoflex is the original KHT shaft — up to 30 grams lighter than anything you've played, with a feel and performance profile that has redefined what's possible from a driver shaft. Five flex options cover every swing from 65 to 125 mph.

Shop Autoflex US ↗ Find a Fitter

Full KHT Construction

Every inch, KHT.

Unlike the Autopower series — where KHT is placed strategically — the SF Series applies Korea Hidden Technology across the entire shaft length. That's why it's the lightest, most responsive, and most unique-feeling shaft we make.

Players report higher launch, lower spin, and the sensation that the clubhead is "finding" the ball without the player trying to help it. That's KHT doing its job.

The Lineup

Five flexes. Every swing.

Model	Weight	CPM (approx.)	Player Profile	Swing Speed	Tip/Butt
SF305X Ladies	39 g	170	Ladies & smooth-tempo seniors	65–85 mph	.335 / .600
SF405 Mens	43 g	180	Mid-tempo amateur	85–95 mph	.335 / .600
SF505 Pro	51 g	210	Strong amateur / low handicap	95–105 mph	.335 / .600
SF505X Tour	54 g	220	Tour-level / aggressive swinger	105–115 mph	.335 / .600
SF505XX Tour+	58 g	240	Elite tour player	115+ mph	.335 / .600

All Autoflex SF shafts are available in .335" driver tip and .350" fairway tip. Length 46". Torque is flex-specific and listed at the point of fitting.

What Players Say

A feel you have to swing to believe.

"The first shaft I've played that actually rewards a smooth tempo."

— KPGA Tour player

"My carry jumped 12 yards. My dispersion tightened. I still don't know how."

— Fitting customer, 7 handicap

"It's the shaft you can't describe until you hit it. Then you get it."

— Fairway Jockey master fitter