Drill America 5/8in Cobalt Split Point Stub Drill Bit

5/8in Cobalt Stub Drill Bit

This 5/8in cobalt stub drill bit is built to Aerospace Standard 907 for heavy-duty use. The 135 degree split point is self-centering and reduces thrust during drilling. Its short, rugged construction suits portable or machine drilling in iron and steel families. Automotive and construction professionals often choose it where spindle clearance is limited.

Upgrade from standard jobber bits

The stub length replaces longer jobber drills when spindle clearance is tight or rigidity is critical. The 135 degree split point upgrades the 118 degree standard point found on larger sizes for faster centering and less walking. Cobalt material upgrades high-speed steel for better heat resistance in tough alloys. The jump is worth it for repetitive screw-machine setups and hard-metal drilling.

Suits screw-machine and tight-clearance work

Mechanics and fabricators running screw machines or drilling in confined spaces will benefit from the short length and split point. Buyers who need deeper hole capacity should look at longer drill bits. Users drilling primarily in wood, plastic or soft non-ferrous metals do not need this cobalt construction. The Proposition 65 notice applies for California compliance.