Chicago-Latrobe
Chicago-Latrobe 50489 118 Degree 17/64 in Extra Long Drill Bit
Extra-long high-speed steel drill bit with a 118-degree notched point for general-purpose machining
- 17/64 in diameter drills precise holes
- 118 degree notched point starts cleanly on contact
- Extra long 5 1/2 in depth reaches deep workpieces
- High-speed steel with black oxide resists wear
- 28 degree helix clears chips efficiently
Extra-Long Drill Bit 17/64 Inch
The Chicago-Latrobe 50489 is a high-speed steel drill bit designed for deep-hole drilling in general-purpose machining. Its extra-long flute length allows access to recessed workpieces that standard bits cannot reach. The black oxide finish helps reduce friction and resist corrosion during extended use. It suits maintenance technicians and metalworkers who need reliable depth performance.
118-Degree Notched Point Geometry
The 118-degree point angle with a notched tip centres the bit quickly and reduces wandering on flat metal surfaces. This geometry is the critical specification that determines whether the bit matches the material and hole-quality requirements of the job. The fractional 17/64-inch diameter fits specific bolt-pattern and tap-drill charts used in automotive and industrial assembly.
Sustained Deep-Hole Drilling
The 5 1/2-inch maximum drilling depth and 4xD length-to-diameter ratio support continuous cutting without frequent withdrawal for chip clearing. The 28-degree helix angle evacuates swarf efficiently during long passes, preventing packing and heat build-up. Black oxide coating retains lubricity longer than bright finish when coolant is limited. Not suited for high-volume production runs requiring carbide tool life or coated high-performance geometries.
Highlights
- 17/64 in diameter drills precise holes
- 118 degree notched point starts cleanly on contact
- Extra long 5 1/2 in depth reaches deep workpieces
- High-speed steel with black oxide resists wear
- 28 degree helix clears chips efficiently
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What does the 118-degree point angle mean when I am drilling?
The 118-degree point angle is a general-purpose geometry that centres the bit quickly and works well in steel, cast iron and most non-ferrous metals.
How does the 17/64-inch fractional size limit what I can drill?
The 17/64-inch diameter fixes the hole size; you cannot enlarge or reduce it without changing to a different bit.
What clearance do I need to fit the 5 1/2-inch drilling depth?
The bit requires at least 5 1/2 inches of open travel beyond the chuck to reach its full cutting depth.
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