Chicago-Latrobe
Chicago-Latrobe 43784 135 Degree Heavy-Duty Jobber Length Drill Bit
A 135-degree split-point jobber drill bit in high-speed steel with TiCN coating for letter-size N holes
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts on contact for accurate holes
- High-speed steel with TiCN coating resists wear in tough materials
- Jobber length gives standard reach for general drilling tasks
- Size N (.3020 decimal) fits precise fractional requirements
- Non-coolant design simplifies use on manual or CNC machines
Chicago-Latrobe 43784 135 Degree Split Point Bit
The Chicago-Latrobe 43784 is a jobber length drill bit manufactured from high speed steel with a TiCN coating. It features a 135 degree split point geometry designed for self-centering and reduced walking on hard materials. The decimal equivalent is .3020 inches, corresponding to letter size N. This accessory is intended for general-purpose drilling in metalworking applications.
Suited for machinists drilling steel
The split point and hard coating benefit users who need accurate hole starts without centre punching and longer edge life in abrasive alloys. It is not suited for buyers who require coolant-through capability for deep-hole chip evacuation or for operations that demand a different point angle for specialised materials. The bit lacks coolant holes and is not designed for non-ferrous plastics or wood where a brad point is preferred.
135 degree split point with TiCN coating
The 135 degree split point combined with the TiCN surface treatment determines whether this bit matches the application. The hard coating increases surface hardness and lubricity while the split point geometry reduces thrust force during entry. Buyers should verify that the .3020 inch diameter and jobber length fit their specific tooling and hole depth requirements before purchasing.
Highlights
- 135-degree split point starts on contact for accurate holes
- High-speed steel with TiCN coating resists wear in tough materials
- Jobber length gives standard reach for general drilling tasks
- Size N (.3020 decimal) fits precise fractional requirements
- Non-coolant design simplifies use on manual or CNC machines
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
When will the TiCN coating on this 43784 bit need replacement?
The TiCN coating wears gradually; replace the bit when the split point no longer cuts cleanly or the 135-degree angle shows visible rounding.
What limit appears first during continuous drilling with the 135-degree split point?
Heat buildup at the cutting edges is the first limit; the high-speed steel softens if the bit runs too hot without cooling pauses.
How much heat does the HAWA high-speed steel generate when running all day?
The HAWA steel and TiCN coating reduce friction, but sustained high-speed drilling still produces significant heat; use cutting fluid and allow cooling intervals.
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