Chicago-Latrobe
Chicago-Latrobe 49212 Screw Machine Drill Bit 3/16 in 135° Split Point HSS Black Oxide
A 3/16 inch high-speed steel screw-machine drill bit with a 135° split point and black-oxide finish for accurate starts and wear resistance
- TypeDrill Bits
- 3/16 in diameter drills precise holes in metal
- 135° split point starts fast without wandering
- High-speed steel resists heat during extended use
- Black oxide finish reduces friction and adds corrosion resistance
- Right-hand cut clears chips efficiently in standard drills
Chicago-Latrobe 49212 Screw Machine Bit
This Chicago-Latrobe 49212 screw machine drill bit is designed for general-purpose drilling in metal, wood and plastic. The 135 degree split point reduces walking and starts holes cleanly without a centre punch. High speed steel construction with a black oxide finish adds wear resistance and helps retain lubricant during use. It suits maintenance technicians, fabricators and DIY users who need reliable performance in portable drills.
135 Degree Split Point Geometry
The single specification that decides fit is the 135 degree split point angle combined with a right-hand cutting direction. This geometry self-centres on contact and produces shorter chips in harder materials such as stainless steel. The decimal equivalent of the diameter is .1875, which corresponds to the 3/16 in size marked on the shank. No coolant-through channel is present, so external lubrication is required for deep holes.
Suited for Hand-Held Drilling Only
Buyers who need a bit for hand-held screw machine or portable drill applications will find this size practical. It is not for buyers who require coolant-through capability for high-volume CNC production, nor for those who need a left-hand cutting direction for extractor work. The black oxide surface is not a premium coating such as TiN, so users expecting maximum tool life in abrasive alloys should evaluate coated alternatives.
Highlights
- 3/16 in diameter drills precise holes in metal
- 135° split point starts fast without wandering
- High-speed steel resists heat during extended use
- Black oxide finish reduces friction and adds corrosion resistance
- Right-hand cut clears chips efficiently in standard drills
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
How does the 135-degree split point change drilling in metal?
The 135-degree split point centres the bit instantly and reduces walking on hard surfaces, so holes start cleanly without a centre punch.
What does the 0.1875 decimal equivalent mean for tool compatibility?
0.1875 inch is the exact decimal size of the 3/16-inch bit, letting you match it precisely to tap charts or CNC tool tables.
Will the straight shank fit my drill chuck without an adapter?
Yes, the straight high-speed steel shank fits any standard three-jaw chuck that accepts 3/16-inch diameter, no adapter required.
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