Cleveland
Cleveland C15121 Screw Machine Drill Bit #31 135° Split Point Cobalt TiAlN
A #31 cobalt drill bit with a 135° split point and TiAlN coating for right-hand cutting
- TypeDrill Bits
- #31 size suits precise drilling tasks
- 135° split point starts cleanly without wandering
- Cobalt construction resists heat and wear
- TiAlN coating extends cutting life
- Right-hand cut matches standard tooling
Product Identity
The Cleveland C15121 is a cobalt screw-machine drill bit sized #31 with a 135-degree split point and TiAlN coating. It suits metalworking shops and maintenance technicians who need a rigid, short-length bit for precise hole-making in tough alloys.
Compatibility Check
Verify that your drill press or handheld drill accepts a straight-shank bit of this diameter and that the 135-degree split point matches the material you are cutting. Confirm the right-hand cutting direction suits your spindle rotation and that coolant-through capability is not required for your application.
Upgrade Path
This bit replaces standard high-speed steel or uncoated cobalt bits of the same #31 size when longer tool life and better heat resistance are needed. The jump is worth it for repetitive drilling in stainless steel or other work-hardening metals where the TiAlN coating reduces wear and the split point improves centring accuracy.
Highlights
- #31 size suits precise drilling tasks
- 135° split point starts cleanly without wandering
- Cobalt construction resists heat and wear
- TiAlN coating extends cutting life
- Right-hand cut matches standard tooling
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Drill Bits |
Questions about this item
What is included in the package and do I need to buy a holder or coolant system separately?
The package contains one Cleveland C15121 screw machine drill bit. The bit is non-coolant through and has a straight shank, so it fits standard drill chucks or collets without a special holder.
How do I decide between the #31 size and other available diameters?
The #31 drill bit has a decimal equivalent of .1200 inch; choose this size when your hole specification calls for that exact diameter.
What does the 135 degree split point with TiAlN coating mean for everyday drilling?
The 135 degree split point self-centres and reduces walking on hard materials, while the cobalt substrate and TiAlN coating resist heat and wear during high-speed drilling.
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