Drill America
Drill America 39/64in 1/2in Reduced Shank Cobalt Drill Bit
A 39/64 inch cobalt drill bit with a 1/2 inch reduced shank for use in larger drill chucks
- TypeDrill Accessories
- 39/64 inch diameter drills large holes
- 1/2 inch reduced shank fits standard chucks
- Cobalt steel construction resists heat and wear
- Bronze oxide coating extends cutting life
39/64 inch Cobalt Drill Bit for Heavy-Duty Drilling
This cobalt steel drill bit features a reduced shank design that fits standard half-inch chucks while drilling larger holes. The bronze oxide surface treatment on the flutes helps reduce friction and heat buildup during operation. It is suited for mechanics and fabricators working with stainless steel, cast iron, or other tough alloys. The Silver and Deming style provides extended reach with a six-inch overall length.
Check Chuck Capacity and Workpiece Thickness
Verify that your drill chuck accepts a half-inch shank before ordering. The flute length of three inches limits the maximum depth of cut in a single pass. Ensure the workpiece thickness and material hardness match the capabilities of a cobalt bit with this geometry. Coolant or cutting oil is recommended for the materials this bit is designed to cut.
Highlights
- 39/64 inch diameter drills large holes
- 1/2 inch reduced shank fits standard chucks
- Cobalt steel construction resists heat and wear
- Bronze oxide coating extends cutting life
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
Does the 39/64" cobalt drill bit come with a case or must I buy a case separately?
The bit is sold individually without a case; a storage case must be purchased separately.
When should I choose the 39/64" size over other fractional sizes?
Choose the 39/64" bit when the hole diameter required is .6094 inches, matching that exact fractional specification.
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