Chicago-Latrobe
Chicago-Latrobe 50485 118 Degree Heavy-Duty Extra Long Drill
A 1/4-inch high-speed steel drill bit with a 118-degree notched point, black oxide finish and 5 1/2-inch drilling depth for general-purpose machining
- 118-degree notched point centres the bit for accurate starts
- Extra-long 5-1/2-inch flute reaches deep holes in one pass
- High-speed steel with black-oxide finish resists wear and corrosion
- 28-degree helix clears chips efficiently for smoother cutting
- Machining-grade construction handles general-purpose drilling tasks
Chicago-Latrobe 50485 Extra Long Drill Bit
The Chicago-Latrobe 50485 is a heavy-duty extra long drill bit built for deep-hole drilling. It features a 1/4 inch fractional size and a 118 degree notched point made from high speed steel with a black oxide finish. The 28 degree helix angle supports general purpose machining across metal and wood. Maximum drilling depth reaches 5 1/2 inches at a 4xD ratio.
Suited for deep holes; not for shallow precision
This bit suits machinists and maintenance crews drilling deep through-holes in steel, cast iron or timber where standard-length bits cannot reach. The 118 degree point centres quickly without a pilot hole. Buyers needing a stub-length bit for tight spaces or a split-point geometry for harder alloys should look at a different tool.
5 1/2 inch maximum drilling depth decides fit
The 5 1/2 inch maximum drilling depth is the single figure that determines whether this bit reaches your workpiece. If the material thickness or hole depth exceeds this limit, the tool cannot complete the cut. Verify your required depth against this number before purchasing.
Highlights
- 118-degree notched point centres the bit for accurate starts
- Extra-long 5-1/2-inch flute reaches deep holes in one pass
- High-speed steel with black-oxide finish resists wear and corrosion
- 28-degree helix clears chips efficiently for smoother cutting
- Machining-grade construction handles general-purpose drilling tasks
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How do I keep the 118 degree notched point centred when starting a 5 1/2 inch deep hole?
Clamp the workpiece, centre-punch the mark, and use a drill press or rigid guide; the extra-long flute will walk if started freehand.
When should the 1/4 inch high-speed steel bit be replaced?
Replace it when the black-oxide coating wears off the cutting lips or the notched point no longer self-centres cleanly.
At what depth does chip evacuation become the limiting factor in continuous drilling?
Beyond roughly 4xD the 28 degree helix struggles to clear swarf, so withdraw frequently to prevent binding.
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