Split Point Black Oxide Jobber Drills

Reduced Drill Walking

The split-point design helps the drill engage the workpiece more accurately, reducing the tendency to wander when starting holes on smooth metal surfaces.

Improved Starting Accuracy

135-degree split-point geometry is particularly useful when accurate hole placement is important. In many applications, it reduces the need for center punching, although spotting or center punching may still be beneficial for precision work.

Reduced Starting Thrust

The modified point geometry helps reduce the thrust required to begin drilling compared with many conventional 118-degree points, making it useful for metalworking and production applications.

High-Speed Steel Construction

HSS provides a practical combination of hardness, toughness, and cutting performance for general-purpose drilling in common metals and other machinable materials.

Black Oxide Surface Treatment

The black oxide finish provides a protective surface treatment and helps retain cutting lubricant. Black oxide is not a titanium nitride coating and does not change the underlying HSS into cobalt steel.

Standard Jobber Length

Jobber-length construction provides a useful balance of reach and rigidity for drill presses, machine tools, and compatible portable drills.

135-Degree Split Point Drills

Split-point drills feature a modified cutting point that helps reduce walking, improves starting accuracy, and lowers the thrust needed to begin drilling. They are particularly useful for drilling metal and applications where accurate hole placement is important.

Standard 118-Degree Point Drills

Conventional 118-degree drills are widely used for economical, general-purpose drilling in mild steel, aluminum, brass, plastics, wood, and other common materials.

They are a dependable choice for routine drilling, although center punching or spot drilling may be helpful to prevent walking on smooth metal surfaces.

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Which Drill Point Is Better for Metal?

For metalworking applications where accurate hole placement and reduced walking are important, 135-degree split-point drills are often the preferred choice. Conventional 118-degree drills remain an economical and versatile option for general-purpose drilling.

Mild Steel and Carbon Steel

135-degree split-point HSS drills are well suited for drilling mild steel, carbon steel, steel brackets, sheet metal, and general fabrication materials. Their point geometry helps improve starting accuracy on metal surfaces.

Aluminum

Split-point drills can be used for many aluminum drilling applications. Proper speeds, feed pressure, and chip evacuation help produce clean holes and minimize material buildup.

Brass and Copper

These drills can be used for suitable brass and copper applications. Adjust cutting conditions to the workpiece material and ensure the workpiece is securely clamped.

Sheet Metal and Fabricated Parts

Split-point geometry helps reduce drill walking when starting holes in sheet metal and fabricated components. Secure the workpiece and use appropriate backing or clamping where necessary.

Plastics and Other Machinable Materials

HSS split-point drills can be used in many plastics and other machinable materials. Adjust drilling conditions to reduce overheating, melting, or cracking.

Stainless Steel and Tough Alloys

HSS split-point drills can be used for some stainless steel applications, but cobalt drills are often a better choice for frequent drilling in stainless steel and tougher alloys because of their increased hot hardness and wear resistance.

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Start with Proper Alignment

Although split-point drills help reduce walking, accurate drill alignment and secure workpiece positioning remain important for producing straight, properly located holes.

Select the Correct RPM

Choose drilling speed based on the material and drill diameter. Larger drills generally require lower RPM than smaller drills when cutting the same material.

Use Cutting Fluid for Metal Drilling

Appropriate cutting fluid helps reduce heat and friction and can extend cutting-edge life when drilling steel and other metals.

Maintain Consistent Feed Pressure

Apply enough pressure to allow the cutting edges to remove material effectively without forcing the drill. Excessive pressure can damage the tool, while insufficient feed may cause rubbing and heat buildup.

Secure the Workpiece

Clamp the workpiece securely to minimize movement and vibration. Proper setup helps improve hole quality, accuracy, and safety.