Chicago-Latrobe
Chicago-Latrobe 50739 19/64 in 118 Degree Extra Long Drill Bit
Extra-long 19/64 in high-speed steel drill bit with 118-degree notched point and black oxide finish for deep holes up to 9 in
- Extra reach with 9 in maximum drilling depth
- Precise 118 degree notched point angle
- Durable high speed steel with black oxide finish
- General purpose machining grade material
- Extra long 4xD fractional inch design
19/64 in Extra Long Drill Bit
The Chicago-Latrobe 50739 is a high-speed steel drill bit with a black oxide finish for general-purpose machining. Its 118-degree notched point helps with accurate starts in metal, wood, and plastic. The fractional inch sizing suits standard workshop requirements. Builders needing a shorter flute length or a different point geometry should look elsewhere.
Sustained deep-hole drilling behaviour
The 9-inch maximum drilling depth and 4xD ratio allow the bit to reach further than standard jobber lengths without frequent withdrawal. High-speed steel construction resists heat buildup during extended cuts in mild steel. The 28-degree helix angle assists continuous chip evacuation. Users drilling abrasive alloys or requiring coolant-fed operation will find this design insufficient.
Installation practicality and common issues
The straight shank fits any standard three-jaw chuck without adapters or special tooling. Black oxide coating reduces galling during initial break-in. The notched point can grab aggressively on thin sheet stock, causing tear-out if feed pressure is not moderated. The extra length increases deflection risk when the workpiece is not rigidly clamped.
Highlights
- Extra reach with 9 in maximum drilling depth
- Precise 118 degree notched point angle
- Durable high speed steel with black oxide finish
- General purpose machining grade material
- Extra long 4xD fractional inch design
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Does the 19/64 in drill bit generate noticeable heat when drilling continuously at its 9 in maximum depth?
The 118 degree notched point on this high-speed steel bit is designed to reduce thrust and heat buildup during deep drilling, while the black oxide finish helps dissipate heat and resist wear during extended use.
What type of drill chuck is required to hold the 19/64 in shank on this extra-long bit?
This fractional-inch bit requires a drill chuck that accommodates at least a 19/64 in shank diameter, typically a 1/2 in or larger capacity chuck found on heavy-duty corded or cordless drills.
Will the 118 degree point angle on this 50739 bit work effectively in older cast iron or mild steel workpieces?
Yes, the 118 degree point angle with notched geometry is a general-purpose machining grade suited for older materials like cast iron and mild steel, providing reliable centering and chip evacuation in those metals.
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