Chicago-Latrobe
Chicago-Latrobe 50509 21/64 in 118 Degree Extra Long Drill Bit
Extra-long high-speed steel drill bit with a 21/64 inch diameter and 118-degree notched point for deep general-purpose machining
- Extra reach for deep holes with 5 1/2 in maximum drilling depth
- Precise 118-degree notched point angle improves centering on contact
- High-speed steel construction with black oxide finish resists wear during general-purpose machining
- 4xD length-to-diameter ratio provides extended reach without sacrificing rigidity
- Fractional 21/64 in size suits standard imperial drilling applications
Chicago-Latrobe 50509 Extra Long Drill Bit
The Chicago-Latrobe 50509 is a fractional-inch drill bit sized at 21/64 in for general-purpose machining. Its extra-long design reaches a maximum drilling depth of 5 1/2 in, making it suitable for deep-hole applications in metal or wood.
118 Degree Notched Point Geometry
The 118-degree point angle with a notched tip is engineered for standard drilling across common materials. A 28-degree helix angle supports chip evacuation, though the bit lacks specialised coatings for high-heat or abrasive alloys.
5 1/2 Inch Maximum Drilling Depth
The 4xD length ratio delivers a 5 1/2 in drilling capacity that determines whether this bit reaches your workpiece. Buyers needing shallower holes or longer reach must select a different length specification.
Highlights
- Extra reach for deep holes with 5 1/2 in maximum drilling depth
- Precise 118-degree notched point angle improves centering on contact
- High-speed steel construction with black oxide finish resists wear during general-purpose machining
- 4xD length-to-diameter ratio provides extended reach without sacrificing rigidity
- Fractional 21/64 in size suits standard imperial drilling applications
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Should I choose the 21/64 inch size or a different diameter for my job?
This bit is 21/64 inch diameter. Choose it when the hole must be that exact fractional size; select another diameter from the range if your tap, bolt or pilot hole calls for a different measurement.
What does the 118 degree point angle mean when I am drilling?
The 118 degree point with a notched tip centres quickly in steel and general-purpose materials, giving a standard cutting action without the aggressive self-centring of a split-point design.
How does the straight shank affect what chuck I can use?
The straight shank fits any standard three-jaw drill chuck up to its capacity, so you can run the bit in a hand drill, drill press or magnetic base machine without a special holder.
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