AutoFlex SF Driver Shaft
Choose Weight, Flex & Adapter – Custom Built
The AutoFlex SF Driver Shaft represents one of the most innovative approaches to golf shaft design in modern equipment. Developed by Dumina Co. in South Korea, the AutoFlex SF Series is engineered to increase clubhead speed while maintaining stability and consistent energy transfer throughout the swing.
Unlike traditional shaft models that rely on conventional flex labels, the AutoFlex SF lineup uses a “Spec-Free” (SF) fitting system. Each model is designed to match specific swing speed ranges rather than traditional flex categories, allowing golfers to find a more precise fit for their individual tempo and delivery.
Built with proprietary K.H.T. (Korea Hidden Technology), the AutoFlex SF shaft features an ultra-lightweight construction and a uniquely responsive profile that loads easily during the swing. This design allows golfers to generate more speed with less effort while maintaining a stable swing posture and improved consistency through impact.
The result is a smooth, powerful release that promotes a mid-to-high launch with strong carry distance. Many golfers report increased clubhead speed and enhanced distance potential when paired with the correct driver head and swing weight setup.
Available in multiple SF models covering swing speeds from approximately 65 mph to 120+ mph, the AutoFlex SF Series provides a unique fitting solution for a wide range of players seeking effortless speed and increased distance.
As an Authorized AutoFlex Dealer, every shaft is professionally built to your exact specifications.
Professional Assembly & Length Specifications
All custom-built shafts ship with your selected adapter and Tour Velvet 360 grip installed for seamless plug-and-play performance with your current driver. Each shaft is assembled to standard playing length based on the selected adapter unless otherwise specified.
If you require modifications, please include special instructions in the Notes section provided, including:
- Left-Handed (LH) adapter request
- Custom playing length
- Grip preference
- Tipping instructions
Left-Handed adapters and Midsize Tour Velvet 360 grips are in stock and available upon request.
Driver Standard Playing Lengths (EOG)
- All Taylormade Drivers – 45.75" EOG
- Mini Driver – 43.75" (available upon request)
- Titleist GT / TSR / TSi / TS Drivers – 45.5" EOG
- GT Mini Driver – 43.5" EOG
- All Callaway Drivers – 45.75" EOG
- Ping G440 Driver – 46" EOG
- Ping G430 / G425 / G410 Drivers – 45.75" EOG
- Cobra DS-Adapt – 45.5" EOG
- Tour Length (44.5") available upon request
- Cobra Darkspeed / Aerojet / LTDx / Radspeed Drivers – 45.5" EOG
- All PXG Drivers – 45.5" EOG
- Secret Weapon Mini Driver – 43.75" available upon request
- All Mizuno Drivers – 45.5" EOG
- Srixon ZXi / Z Series Drivers – 45.75" EOG
Tipping Policy
Driver shafts are not tipped unless specifically requested.
We follow official AutoFlex manufacturer recommendations to ensure peak performance and structural integrity.
AutoFlex SF Technology
- Ultra-lightweight design engineered to increase clubhead speed
- Spec-Free (SF) fitting system matched to swing speed ranges
- K.H.T. (Korea Hidden Technology) construction for optimized energy transfer
- Smooth loading profile promoting mid-high launch and increased carry
The AutoFlex SF Driver Shaft delivers a unique combination of effortless speed, smooth feel, and powerful distance potential for golfers seeking a different approach to driver performance.
Why Order from The Shaft Store?
- Authorized AutoFlex Dealer
- 100% Authentic — No pullouts or gray market inventory
- Built to OEM playing standards
- Trusted by thousands of golfers
Every shaft is custom built, measured, and quality checked prior to shipment.
