Chicago-Latrobe
Chicago-Latrobe 50743 118 Degree Heavy-Duty Extra Long Drill Bit
Extra-long 3/8 inch high-speed steel drill bit with 118-degree notched point and black oxide finish for deep-hole drilling
- Extra-long reach for deep-hole drilling with 9 in maximum depth
- 118-degree notched point starts cleanly and reduces wandering
- High-speed steel with black oxide resists wear and heat
- 28-degree helix clears chips efficiently in deep cuts
- General-purpose grade suits a wide range of materials
Chicago-Latrobe 50743 Extra Long Drill Bit
The Chicago-Latrobe 50743 is a heavy-duty extra long drill bit designed for deep-hole drilling tasks. It suits professional mechanics and fabricators who need extended reach in metalwork applications. The fractional inch sizing fits standard drill chucks without adapters. This tool is not for buyers who need a full drill bit set or drivers for fastener work.
3/8 Inch Diameter with 9 Inch Maximum Drilling Depth
The 3/8 inch diameter provides a balance between material removal rate and drill rigidity. A maximum drilling depth of 9 inches allows access through thick workpieces or deep cavities. The 4xD length-to-diameter ratio offers stability but limits use in extremely deep holes beyond this proportion. It runs out of effective reach for depths exceeding the stated maximum or for hole sizes outside the fractional range.
High Speed Steel Construction
High speed steel construction delivers durability for general-purpose machining across common metals. The 118 degree notched point angle aids centring and reduces walking at the start of the cut. A 28 degree helix angle supports chip evacuation in deep holes while the black oxide finish adds corrosion resistance. The straight shank implies compatibility with standard three-jaw chucks for everyday workshop use.
Highlights
- Extra-long reach for deep-hole drilling with 9 in maximum depth
- 118-degree notched point starts cleanly and reduces wandering
- High-speed steel with black oxide resists wear and heat
- 28-degree helix clears chips efficiently in deep cuts
- General-purpose grade suits a wide range of materials
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Will the 118-degree notched point start cleanly in the same materials I already drill with my standard high-speed steel bits?
The 118-degree notched point is a general-purpose geometry that behaves like conventional high-speed steel bits, so it will start and cut in the same steels, cast iron and non-ferrous metals you currently drill.
How can I confirm the bit is running true after I chuck it in my drill press?
Run the drill press at low speed and watch the 3/8-inch shank for wobble; a straight, steady rotation with no visible run-out shows the extra-long bit is seated correctly and running true.
Does the package include any cutting fluid or a protective case for the 9-inch flute length?
The bit ships as a single 3/8-inch high-speed steel drill with black oxide finish; cutting fluid and a storage case are not included and must be purchased separately.
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