AutoFlex SF 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. Each shaft frequency-matched to ±2 CPM at the factory.
Available in Driver and Fairway Wood configurations. Dumina is the only shaft manufacturer in the world that designs dedicated fairway wood shafts built around KHT — each tuned for the shorter length, higher loft, and different loading dynamics of a fairway wood. Not repurposed driver shafts.
| Model | Weight (g) | Swing Weight | Swing Speed | Flex Profile |
|---|---|---|---|---|
| SF305x | 41 | C7-C9 | 70-90 mph | Senior / Ultra-Light |
| SF405 | 45 | C9-D0 | 85-100 mph | Regular / Light |
| SF505 | 50 | D0-D1 | 95-100 mph | Stiff / Mid |
| SF505x | 55 | D1-D1.5 | 100-110 mph | X-Stiff / Tour |
| SF505xx | 57 | D1.5-D2 | 110-120 mph | XX-Stiff / Tour+ |
| Model | Weight (g) |
|---|---|
| SF405 | 51 |
| SF405x | 54 |
| SF505 | 56 |
| SF505x | 58 |
| SF505xx | 60 |
Proprietary internal construction releases clubhead speed at the moment of impact — not before. The shaft does more work so you don't have to.
Up to 30 grams lighter than conventional shafts without sacrificing stability. Reallocated mass where it matters most.
Every shaft frequency-matched to ±2 CPM. Industry standard is ±10. The shaft you order is the shaft you get.
| Model | Weight (g) | Swing Weight | Swing Speed | Recommended Club |
|---|---|---|---|---|
| SF305 | 40 | C5-C9 | 70-90 mph | 3W, 5W, 7W |
| SF405 | 43 | C6-D0 | 85-100 mph | 3W, 5W, 7W |
| SF405x | 45 | C9-D1 | 95-105 mph | 3W, 5W |
| SF505 | 48 | D0-D1.5 | 95-105 mph | 3W, 5W |
| SF505x | 53 | D1-D2 | 100-110 mph | 3W, 5W |
| SF505xx | 56 | D1-D2 | 110-120 mph | 3W |
| Model | Weight (g) | Swing Weight | Swing Speed | Flex Profile |
|---|---|---|---|---|
| SF405 | 50 | C9-D0 | 85-100 mph | Regular / Mid-launch |
| SF405x | 53 | D0-D1 | 90-100 mph | Stiff / Controlled |
| SF505 | 56 | D1-D2 | 95-105 mph | Stiff / Low-mid launch |
| SF505x | 58 | D1.5-D2 | 105-120 mph | X-Stiff / Low launch |
| Model | Weight (g) | Swing Weight | Swing Speed | Tip |
|---|---|---|---|---|
| SF305 | 47 | D0-D2 | 75-90 mph | .370 |
| SF405 | 50 | D0-D2 | 85-100 mph | .370 |
| SF505 | 53 | D0-D2 | 95-105 mph | .370 |
Visit an authorized Dumina fitter to get custom-fitted for the AutoFlex SF Series.