Chicago-Latrobe
Chicago-Latrobe 50811 Screw Machine Drill Bit Cobalt 7/32 135 Deg
A cobalt steel screw-machine drill bit with a 135-degree split point for precise right-hand cutting in hard metals
- TypeDrill Bits
- MaterialCobalt Steel
- Cobalt steel resists heat for longer tool life
- 135-degree split point starts holes without wandering
- 8% cobalt M42 alloy handles tough metals
- Right-hand cut suits standard drill chucks
- 7/32 inch size matches common fastener needs
Chicago-Latrobe Cobalt Drill Bit 7/32
This Chicago-Latrobe screw machine drill bit is made from cobalt steel with 8% cobalt content (M42). It suits metalworkers and maintenance technicians who need a durable bit for drilling hard materials such as stainless steel and high-strength alloys. The 135-degree split point reduces walking and starts the cut cleanly. Right-hand cutting direction matches standard drill chucks and drivers.
135-degree split point limits
The 135-degree point angle is optimised for harder metals and may wander on very soft or thin sheet material without a centre punch. Cobalt steel holds an edge longer than standard high-speed steel but is more brittle, so heavy side loads can cause chipping. The 7/32-inch diameter (decimal equivalent .2188) fixes the hole size; it cannot be adjusted for clearance or tap drill requirements. The split point helps self-centring but does not replace a rigid setup.
Installation and common issues
The bit installs in any standard three-jaw chuck or quick-change holder that accepts a straight shank. Ensure the chuck is tightened evenly on the flats to prevent slippage during high-torque drilling. The most frequent problem is premature dulling caused by excessive speed or insufficient coolant; run at lower RPM and use cutting fluid for best life. Overheating can also turn the straw/bronze surface colour blue, indicating lost temper.
Highlights
- Cobalt steel resists heat for longer tool life
- 135-degree split point starts holes without wandering
- 8% cobalt M42 alloy handles tough metals
- Right-hand cut suits standard drill chucks
- 7/32 inch size matches common fastener needs
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | Cobalt Steel |
Questions about this item
Should I choose the 7/32 inch size or a different diameter for my job?
The 7/32 inch diameter equals 0.2188 inch decimal equivalent. Pick this size when the hole must match that exact dimension; choose another diameter only if the drawing calls for a different hole size.
How does the 135 degree split point behave in a real machine?
The 135 degree split point centres itself on contact, reduces thrust and prevents walking on hard materials such as stainless steel or cast iron.
What does the M42 cobalt grade mean for the cutting standard in practice?
M42 denotes 8 % cobalt in the high-speed steel, giving higher red hardness so the edge stays sharp longer at elevated drilling temperatures.
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