Chicago-Latrobe
Chicago-Latrobe 43790 135 Degree Heavy-Duty Jobber Length Drill Bit
A heavy-duty jobber length drill bit with a 135 degree split point made from high speed steel and TiCN coating
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts on contact without walking
- High-speed steel with TiCN coating resists wear in tough materials
- Jobber length gives standard reach for general drilling
- Decimal size .3580 matches letter T for precise holes
- Heavy-duty construction handles demanding shop applications
Jobber-length drill bit for T-size holes
This Chicago-Latrobe drill bit is a jobber-length twist drill sized to letter T with a decimal equivalent of .3580. It is manufactured from high-speed steel and finished with a TiCN coating for extended wear resistance. The 135-degree split point is designed to start on contact and reduce walking. It suits general-purpose drilling in metal and other materials.
135-degree split point and non-coolant design
The 135-degree point angle allows faster penetration in harder materials compared to shallower angles. A split-point geometry self-centres the bit, eliminating the need for a centre punch in many applications. The tool has no coolant holes and is not a coolant-through design, so chip evacuation relies on standard flute geometry and periodic withdrawal. This limits continuous deep-hole drilling without external lubrication.
TiCN-coated high-speed steel for T-size capacity
The TiCN coating increases surface hardness and reduces friction, letting the bit handle higher cutting speeds than uncoated high-speed steel. It comfortably drills the .3580-inch diameter in steel, cast iron and non-ferrous alloys. The jobber-length flute provides standard reach for through-holes and blind holes of moderate depth. The bit runs out of effective chip clearance in very deep holes or when drilling abrasive materials that demand internal coolant delivery.
Highlights
- 135° split point starts on contact without walking
- High-speed steel with TiCN coating resists wear in tough materials
- Jobber length gives standard reach for general drilling
- Decimal size .3580 matches letter T for precise holes
- Heavy-duty construction handles demanding shop applications
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Should I choose the T-size drill bit or another letter size for my application?
The T-size drill bit has a decimal equivalent of 0.3580 inches; select this size when your project requires a hole diameter of 0.3580 inches.
What does the 135-degree point angle mean for drilling performance?
A 135-degree split point reduces walking and starts drilling on contact, making it suitable for harder materials with the high-speed steel construction.
Is the TiCN coating compatible with standard drill chucks and what does it protect against?
The TiCN coating increases surface hardness and wear resistance on the high-speed steel body while the straight shank fits standard drill chucks.
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