Product Specification
COBALT DRILL BIT SET - 29 PIECE
When standard drill bits start losing their edge to heat, step up to cobalt. This 29-Piece Cobalt Drill Bit Set is built from M35 cobalt high-speed steel to maintain cutting hardness under the higher temperatures generated in demanding metal drilling. That makes it an excellent shop-ready choice for stainless steel and other applications where heat resistance, dependable cutting performance, and a complete range of fractional sizes matter.
With every size from 1/16" through 1/2" in 1/64" increments, this set eliminates the gaps that slow down fabrication, maintenance, repair, and production work. Each bit features a 135° split point to help reduce starting wander, spiral flutes for chip evacuation, and precision-ground one-piece construction. Sizes 3/16" and larger add three-flat shanks to help resist slipping in the chuck. Bits come in a handy plastic storage indexing container that helps protect the bits when not in use.
Product Specifications
| Specification |
Details |
| Set Size |
29 Pieces |
| Size Range |
1/16"–1/2" |
| Size Increments |
1/64" |
| Material |
M35 Cobalt High-Speed Steel |
| Point |
135° Split Point |
| Length Class |
Jobber |
| Flute Style |
Spiral |
| Shank |
Round through 11/64"; Three-Flat from 3/16" |
| Storage |
Plastic Storage Indexing Container |
Features
- M35 cobalt high-speed steel helps retain cutting hardness under demanding drilling heat
- Complete 29-piece fractional range from 1/16" through 1/2"
- Every size increases in precise 1/64" increments
- 135° split points help reduce starting wander
- Spiral flutes help clear chips while drilling
- Precision-ground, one-piece construction for consistent drilling performance
- Round straight shanks through 11/64"
- Three-flat shanks from 3/16" through 1/2" help resist slipping in the chuck
- Jobber-length design provides a practical balance of reach and rigidity
- Handy plastic storage indexing container helps organize and protect the bits when not in use
Included Sizes
One drill bit of each fractional size from 1/16" through 1/2" in 1/64" increments:
1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", and 1/2".
Applications & Performance
M35 cobalt high-speed steel makes this set especially well suited for demanding stainless steel drilling where controlling heat at the cutting edge is critical. Use suitable drilling speed, cutting fluid, steady feed pressure, and secure workholding based on the stainless grade, bit diameter, and machine.
The set is also suitable for aluminum with appropriate speed, feed, cutting fluid selection, and chip clearance. The 135° split point helps establish the hole with less walking, while spiral flutes provide a path for chips to move away from the cutting edges. Proper alignment and controlled feed help reduce side loading and unnecessary heat buildup.
Materials
Machine Compatibility
This 29-piece set includes straight-shank drill bits ranging from 1/16" through 1/2". Machine compatibility depends on the installed chuck securely gripping the selected bit and on the machine's drilling capacity for the material being worked. Use rotary drilling mode and select the proper speed and feed for the material and bit diameter. Confirm the machine’s drilling capacity for the material and its available speed range; chuck fit alone does not establish suitability for every application. For larger holes in stainless steel, use a machine that can run at the required low speed.
Compatible examples include:
-
RIKON® 30-212VS Drill Press — supports the full 1/16"–1/2" set
-
WEN® 4214T Drill Press — supports the full 1/16"–1/2" set
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Grizzly® G7943 Drill Press — supports the full 1/16"–1/2" set
-
Grizzly® G7942 Drill Press — supports the full 1/16"–1/2" set
-
Makita® XFD13Z Drill/Driver — use when the installed chuck securely grips the selected shank
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Milwaukee® 3403-20 Drill/Driver — use when the installed chuck securely grips the selected shank
-
Milwaukee® 3404-20 Hammer Drill/Driver — use when the installed chuck securely grips the selected shank; select drilling-only mode
-
DEWALT® DCD800B Drill/Driver — use when the installed chuck securely grips the selected shank
-
Bosch® GSR18V-400 Drill/Driver — for supported metal drilling sizes through 3/8"; verify chuck grip for the selected bit
-
Bosch® GSR12V-300 Drill/Driver — for sizes through 3/8"; verify chuck grip for the selected bit
For machines with a 3/8" maximum chuck or material-drilling capacity, the larger bits in this set will require a different machine. Always confirm the installed chuck and machine capacity before use.
Safety Tips
- Wear appropriate eye protection when drilling.
- Secure the workpiece with suitable clamps or a vise before drilling.
- Keep loose clothing, hair, and other items away from rotating parts.
- Use rotary drilling mode and turn off hammer action on hammer drills.
- Match drilling speed and feed pressure to the material and bit diameter.
- Use appropriate cutting fluid when drilling stainless steel.
- Maintain steady feed to reduce rubbing and unnecessary heat buildup.
- Keep the drill aligned with the bit to reduce side loading.
- Clear chips as needed during deeper holes.
- Confirm the chuck securely grips the selected shank before starting.
