Chicago-Latrobe
Chicago-Latrobe 42021 21/64 in 135 Degree Split Point Jobber Drill Bit
A 21/64 in high-speed steel jobber drill bit with a 135 degree split point and TiCN coating for accurate drilling
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts drilling on contact
- 21/64 in diameter suits medium-hole tasks
- High-speed steel body resists wear in steel
- TiCN coating reduces friction and heat buildup
- Jobber length gives standard reach for general use
21/64-inch jobber drill bit
The Chicago-Latrobe 42021 is a jobber-length twist drill sized at 21/64 inch with a 135-degree split point. It is made from high-speed steel with a TiCN coating for wear resistance. The fractional size suits general-purpose drilling in metal, wood and plastic where a 0.3281-inch hole is required.
135-degree split-point geometry
The 135-degree point angle reduces thrust and helps the bit self-centre without a pilot hole. The split-point design improves chip ejection in deeper cuts. Because the bit has no coolant holes, it relies on external lubrication or peck drilling to manage heat in tougher alloys.
Fractional sizing and material limits
The 21/64-inch diameter handles typical maintenance and fabrication tasks in steel, aluminium and composites. The TiCN surface extends life in abrasive materials, yet the absence of through-coolant limits continuous deep-hole work in high-alloy steels. Users needing larger diameters or internal cooling should select a different tool.
Highlights
- 135° split point starts drilling on contact
- 21/64 in diameter suits medium-hole tasks
- High-speed steel body resists wear in steel
- TiCN coating reduces friction and heat buildup
- Jobber length gives standard reach for general use
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Which Chicago-Latrobe 42021 jobber drill bit size should I choose for a 21/64 inch hole?
The 42021 is a single 21/64 in fractional bit with a .3281 decimal equivalent, so it matches that exact hole size.
What does the 135 degree split point do once the bit is in the drill?
The 135 degree split point reduces walking and starts cutting faster on hard materials such as stainless steel.
How does the TiCN coating on this high-speed steel bit affect drilling performance?
TiCN increases surface hardness and heat resistance, extending tool life in abrasive or high-speed drilling.
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