Chicago-Latrobe
Chicago-Latrobe 42793 W 5-1/8" HSS 135° Split Point Drill Bit
High-speed steel jobber-length drill bit with a 135° split point for self-centering starts and a TiAlN coating that extends tool life
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts on contact for accurate holes
- High-speed steel construction resists wear in repeated use
- TiAlN coating reduces friction and heat buildup
- Jobber length gives standard reach for general drilling
- Letter size W equals .3860 inch diameter for precise fit
W-Series Jobber Drill Bit
This Chicago-Latrobe 42793 drill bit targets metalworkers who need a precise W-size hole in steel or alloy. The split-point tip reduces walking so the bit starts on target without a centre punch. High-speed steel construction handles the heat of repetitive drilling in maintenance and fabrication shops.
135° Split-Point Geometry Limits
The 135-degree point angle is optimised for harder materials but demands steady feed pressure to avoid chipping the cutting edges. Without coolant-through capability the bit relies on external lubrication or peck cycles to clear swarf from deep holes. Users must match spindle speed to the workpiece to prevent premature wear.
Decimal Equivalent .3860 Decides Fit
The .3860-inch diameter is the single figure that determines whether this bit matches the tap, reamer or clearance hole specified on the drawing. No other size in the letter series shares this dimension so verification against the job requirement is essential before purchase.
Highlights
- 135° split point starts on contact for accurate holes
- High-speed steel construction resists wear in repeated use
- TiAlN coating reduces friction and heat buildup
- Jobber length gives standard reach for general drilling
- Letter size W equals .3860 inch diameter for precise fit
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Is the 42793 model the right drill bit for a 5-1/8 inch jobber length hole?
Yes, the 42793 is a jobber length drill bit sized to letter W, which has a decimal equivalent of .3860 inches, matching the 5-1/8 inch designation.
How does the 135 degree split point perform when drilling into metal?
The 135 degree split point on this high speed steel bit reduces walking and starts cutting immediately, improving accuracy in metal without needing a centre punch.
Does the TiAlN coating on this drill bit change the speeds or feeds I should use?
The TiAlN coating increases surface hardness and heat resistance, allowing higher cutting speeds and longer tool life in steel and stainless steel compared to uncoated high speed steel.
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