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This KnKut 29 Piece Fractional Jobber Length Drill Bit Set is designed for professionals and serious DIYers needing to drill into tough materials like stainless steel and titanium alloy. Its key benefit is the premium-grade Molybdenum high-speed steel construction with a salt nitride treatment, ensuring hardness and durability for demanding applications, though the reduced shank on larger bits may require specific chucks. The set includes sizes from 1/16" through 1/2" by 64ths, featuring a 135-degree split point tip for accuracy and reduced walk.
| Model Part Number | 29KK38DB |
|---|---|
| Brand | KnKut |
The salt nitride treatment significantly increases the surface hardness of the drill bits, allowing them to drill more effectively and durably into tough materials like stainless steel and titanium alloys.
For most applications, the 135-degree split point tip is designed to self-center and prevent walking, eliminating the need for a center punch. However, on extremely hard or slick surfaces, a pilot dimple may still be helpful.
This set is ideal for drilling into tough materials including stainless steel, titanium alloy, hardened steel, cast iron, and general-purpose metals. It can also be used on wood and plastics.
Fractional refers to the measurement system (e.g., 1/4", 1/2"), and jobber length refers to a standard shank and flute length that offers a good balance between rigidity and reach for general-purpose drilling.
The larger bits (25/64" and above) have a 3/8" reduced shank. This allows them to be securely held in drills with 3/8" chucks, which might not be able to grip the full diameter of a standard, larger shank.
Keep the bits clean after use, use appropriate cutting fluids for hard metals, avoid overheating by managing speed and feed, and store them properly to prevent damage.
Yes, while optimized for metal, these bits can also be used for drilling wood. However, for purely woodworking tasks, specialized wood bits might offer a cleaner finish.
Ensure you are using the correct speed and feed rate for the material. For hard metals, use a lubricant and avoid excessive heat buildup. Check for any obstructions in the hole or on the bit.
The 135-degree split point should minimize walking. Ensure the bit is centered properly and apply firm, consistent pressure. A center punch mark may still be beneficial on extremely hard or smooth surfaces.
These bits have a 3/8" reduced shank. Ensure your drill's chuck jaws are fully retracting to grip the reduced shank. If the chuck is a larger size (e.g., 1/2"), the bit may not seat properly. Verify your drill chuck capacity.
Reduce drilling speed and increase feed pressure slightly. Use a cutting fluid or lubricant. Allow the bit and workpiece to cool periodically.
Setup: Ensure the drill bit is securely held in your drill's chuck. For bits with reduced shanks (25/64" and above), confirm your drill chuck can accommodate a 3/8" shank. Select an appropriate speed and feed rate for the material being drilled; harder materials generally require slower speeds and consistent pressure.
Compatibility: These drill bits are compatible with standard drill chucks. The 3/8" reduced shank on larger sizes is specifically designed to fit within 3/8" chucks, which are common on many portable drills. Always ensure your drill has sufficient power for the size of the bit and the material being cut.
Care: To maintain performance and extend the life of your drill bits:
