Zoro Select
Zoro Select 16W780 Cobalt Threaded Shank Drill 3/8 in 135° Point
Cobalt threaded-shank drill bit with a 135° point for hard-metal drilling
- Cobalt construction resists heat and wear
- 135° split point starts holes without wandering
- Black oxide finish adds corrosion protection
- 1/4-28 threaded shank fits compatible drill chucks
- 3/8 in diameter handles medium-duty drilling tasks
Zoro Select Cobalt Drill 3/8 in
The Zoro Select 16W780 is a cobalt threaded-shank drill bit with a 3/8 inch diameter and a 135-degree split point. It targets machinists and maintenance technicians who need a durable bit for drilling hard metals such as stainless steel or titanium alloys. The black oxide finish adds lubricity and helps resist chip welding during repeated use.
1/4-28 Thread Limits Compatibility
The bit uses a 1/4-28 threaded shank rather than a straight round shank, so it only fits tools or adapters that accept that specific thread. It cannot be clamped in a standard three-jaw drill chuck or a quick-change hex holder without a matching threaded collet. The 135-degree point angle is optimised for rigid setups; hand-held drilling may cause the bit to walk on hard surfaces.
Install Into Threaded Holder Only
Installation requires threading the shank fully into a compatible 1/4-28 holder or collet until it seats firmly against the shoulder. Cross-threading is the most common issue if the threads are forced or misaligned at the start. Always verify the holder threads are clean and undamaged before fitting the bit to avoid run-out or shank damage.
Highlights
- Cobalt construction resists heat and wear
- 135° split point starts holes without wandering
- Black oxide finish adds corrosion protection
- 1/4-28 threaded shank fits compatible drill chucks
- 3/8 in diameter handles medium-duty drilling tasks
Specifications
| Brand | ZORO SELECT |
|---|
Questions about this item
Should I choose the 3/8 in cobalt bit or a different size for my job?
The 3/8 in diameter with a 135 degree point and cobalt material suits harder metals; pick another diameter only if the hole size must differ.
What does the 135 degree point do once the bit is in the drill?
The 135 degree point angle centres the cut quickly and keeps the bit from wandering on tough alloys.
What does the 1/4-28 threaded shank mean for fit and speed limits?
The 1/4-28 threads lock into a matching chuck or adapter; maximum RPM follows the tool maker's rating for that shank style.
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