Chicago-Latrobe
Chicago-Latrobe 45710 #40 135° Jobber Drill Bit
A high-speed steel jobber drill bit with a 135-degree split point for precise drilling in metal
- TypeDrill Bits
- MaterialHAWA
- #40 size drills precise small holes
- 135° split point starts fast without wandering
- High-speed steel resists heat during drilling
- Black oxide finish reduces friction and wear
- .0980 decimal equivalent matches wire gauge specs
Chicago-Latrobe #40 Jobber Drill Bit
This Chicago-Latrobe drill bit is a #40 size jobber-length tool designed for general-purpose drilling in metal and other materials. It suits machinists, maintenance technicians and DIY users who need a precise small-diameter hole. The split-point tip helps start the cut cleanly without a centre punch. Buyers who need a larger diameter or a different point angle should choose another bit.
135° Split Point with Black Oxide
The 135-degree split-point geometry reduces walking and lowers thrust force during normal drilling, which can ease load on the drill motor. Black oxide surface treatment adds lubricity and corrosion resistance for longer cutting life. No coolant-through holes are present, so external cooling or peck drilling may be required in deep holes. High-speed steel construction handles typical workshop heat without premature dulling.
Decimal Size 0.0980 Inch Identification
The bit is marked with its decimal equivalent of 0.0980 inch alongside the wire-gauge number 40 for quick size verification. This clear marking helps operators select the correct tool from a mixed set without calipers. No additional accessories, coatings or software are bundled with the bit. The plain shank fits standard three-jaw chucks and collets.
Highlights
- #40 size drills precise small holes
- 135° split point starts fast without wandering
- High-speed steel resists heat during drilling
- Black oxide finish reduces friction and wear
- .0980 decimal equivalent matches wire gauge specs
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How do I install the #40 split-point drill bit and what step do people often miss?
Chuck the 0.0980-inch shank securely in a drill press or hand drill; the split point self-centres so you must not use a centre punch first.
What maintenance will the high-speed steel bit need later?
Resharpen the 135-degree split point when cutting slows; black-oxide coating wears off but does not affect geometry.
What limit appears first during sustained drilling with the 45710?
Heat buildup in the non-coolant-through flute dulls the edge fastest, especially in deep holes without peck cycles.
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