Fluted Hex Keys, Metric Sizes
What Are Fluted Hex Keys?
Fluted hex keys are hex wrenches with spiral grooves machined into the driving end. The flutes relieve material along the flats of the hex shape, creating additional cutting and contact edges where the tool meets the fastener recess. This increases the effective grip between the key and the socket head, which reduces slipping and cam out under high torque or after a fastener recess has started to wear.
Fluted hex keys are chosen for demanding assembly and maintenance work, including production settings where fastener recesses see frequent use, and situations where a worn or slightly damaged recess would cause a plain hex key to slip. Like other hex key styles, they are available in a full metric size range and work in both short arm and long arm configurations.
Key Features and Benefits
- Fluted Design for Better Grip: spiral grooves add contact edges inside the fastener recess.
- Reduced Cam Out Under Torque: holds its bite better than a plain key on worn or heavily used recesses.
- Hardened Steel Construction: built to resist wear from repeated high torque driving.
- Full Metric Size Range: matches standard metric socket head fasteners.
- L-Shaped for Leverage: the familiar L-shape gives a solid lever arm for tightening and loosening.
Materials and Finishes
- S2/S3 Tool Steel: hardened for durability under repeated high torque use.
- Black Finish: a low glare, corrosion resistant finish for shop and field use.
Standards Compliance
- ISO 2936, Hexagon socket screw keys, dimensions
- DIN 911, Hexagon socket screw keys
- ASME/ANSI B18.3, Reference dimensions for hex socket head fasteners and keys
Size Range and Availability
Available in a full metric hex key size range, sold individually or as multi size sets.
Related Categories and Products
Frequently Asked Questions (FAQs)
1. What are fluted hex keys used for?
They are used to drive socket head fasteners in demanding assembly or maintenance settings where extra grip and resistance to cam out are needed.
2. How are fluted hex keys different from plain hex keys?
A plain hex key has flat, smooth sides, while a fluted hex key has spiral grooves cut into the driving end that add contact edges and improve grip inside the fastener recess.
3. Do fluted hex keys fit the same fasteners as plain hex keys?
Yes. They are sized to the same standard metric hex socket dimensions and fit the same fasteners, the flutes only change the contact pattern at the driving end.
4. Will fluted hex keys help with a worn fastener recess?
In many cases yes, since the extra contact edges can bite into a recess that has started to round out, though a badly damaged recess may still be difficult to drive with any hex key.
5. Are fluted hex keys available in short arm and long arm styles?
Yes. Like other hex key styles, they are available in configurations suited to both tight clearance and open reach work.
6. What sizes do you stock for fluted hex keys?
We stock a full metric hex key size range, available individually or as multi size sets.
