Chicago-Latrobe
Chicago-Latrobe 50581 33/64 in 118 Degree Extra Long Drill Bit
Extra-long 33/64 in high-speed steel drill bit with 118-degree notched point for deep drilling up to 9 in
- Extra reach with 9 in maximum drilling depth
- Precise 118 degree notched point for accurate starts
- Durable high-speed steel with black oxide finish
- General-purpose machining across common materials
- Heavy-duty construction built for demanding tasks
Chicago-Latrobe 50581 33/64 in Drill Bit
The Chicago-Latrobe 50581 is a 33/64 inch fractional inch drill bit designed for general-purpose machining. Its 118 degree notched point angle and high speed steel construction suit professional mechanics and maintenance crews who need accurate hole starts in metal stock. The extra long body provides a maximum drilling depth of nine inches for deep-hole applications.
Sustained Load Behaviour
High speed steel maintains hardness at the elevated temperatures generated during continuous drilling cycles. The black oxide finish reduces friction and helps dissipate heat, supporting consistent chip evacuation over the full nine inch depth. The 28 degree helix angle moves swarf efficiently, preventing binding during extended operations in tough materials.
Build Quality and Connectors
A straight round shank fits standard three-jaw chucks without adapters, allowing quick tool changes on bench or handheld drills. The notched point geometry centres the bit on contact, reducing walk on curved or angled surfaces. Black oxide coating adds corrosion resistance for workshop storage between jobs.
Highlights
- Extra reach with 9 in maximum drilling depth
- Precise 118 degree notched point for accurate starts
- Durable high-speed steel with black oxide finish
- General-purpose machining across common materials
- Heavy-duty construction built for demanding tasks
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How much heat builds up when the 118-degree notched point runs at 28-degree helix angle all day?
The 118-degree point and 28-degree helix are designed for general-purpose machining, letting chips clear steadily during extended drilling sessions.
What shank style does the 33/64-inch bit need so my drill accepts it?
The fractional-inch bit fits standard three-jaw chucks that open to at least 33/64 in, so a typical 1/2-inch capacity drill will hold it.
Will the 9-inch flute length reach through the same workpieces my shorter bits handle?
With a 9-inch maximum drilling depth and 4xD proportion, this bit reaches deeper than standard-length bits while using the same high-speed steel construction.
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