Drill America
Drill America 5-piece cobalt drill bit set 1/4 to 1/2 inch
Five cobalt jobber drill bits from 1/4 to 1/2 inch with 135 split points for self-centering in stainless steel and titanium
- ColorTransparent
- Cobalt steel handles stainless steel and titanium
- 135 split point centres itself and cuts thrust
- Jobber length drills deep holes efficiently
- Made to aerospace standard 907 for consistency
- Five bits from 1/4 to 1/2 inch cover common sizes
Drill America Cobalt Bit Set
The Drill America five-piece set contains cobalt steel jobber-length bits ranging from one-quarter to one-half inch. It is aimed at mechanics and fabricators who regularly drill stainless steel, inconel, titanium and other high-tensile alloys. The 135-degree split point is self-centering and reduces the thrust needed to start a hole. A plastic pouch keeps the bits organised in a toolbox or drawer.
Sustained Drilling Performance
Cobalt steel retains hardness at elevated temperatures, allowing cutting speeds up to thirty percent higher than conventional M2 high-speed steel during prolonged use. The material meets National Aerospace Standard 907, indicating consistent metallurgy for repetitive heavy-duty work. The split-point geometry helps maintain accuracy and lower cutting forces even as the bit warms. The set covers common fractional sizes for general shop tasks.
Installation And Common Issues
Each bit fits any standard three-jaw chuck that accepts the corresponding shank diameter, so no special holders are required. The self-centering point eliminates the need for a centre punch in most materials. Users should verify that their drill press or hand drill provides adequate torque for the larger diameters. California Proposition 65 warnings apply because the bits contain a listed chemical.
Highlights
- Cobalt steel handles stainless steel and titanium
- 135 split point centres itself and cuts thrust
- Jobber length drills deep holes efficiently
- Made to aerospace standard 907 for consistency
- Five bits from 1/4 to 1/2 inch cover common sizes
Specifications
| Brand | DRILL AMERICA |
|---|---|
| Color | Transparent |
Questions about this item
How much heat builds up when the 135 split-point cobalt bits run at 30% higher speeds all day?
Cobalt steel keeps its hardness at elevated temperatures, so the bits resist softening even when pushed to faster feed rates in stainless steel or titanium.
What chuck size is needed to hold the 1/2-inch bit in this set?
A 1/2-inch or larger drill chuck is required to grip the largest bit securely.
Will the National Aerospace Standard 907 bits fit the same collets as older M2 high-speed steel jobbers?
Yes — they share standard jobber-length shanks, so existing drill chucks and collets accept them without adapters.
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