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Short cobalt stub drill bit with 135-degree split point

Drill America

Drill America 51/64 in Cobalt Stub Drill Bit 135° Split Point

SKU CH-2AS2-986P6

Cobalt stub drill bit with 135° split point for self-centering, reduced-thrust drilling in iron and steel

  • Product typeDrill Accessories
  • Cobalt alloy withstands heavy-duty drilling
  • 135° split point self-centers and reduces thrust
  • Manufactured to Aerospace Standard 907
  • Short rugged design suits limited spindle clearance
  • Performs well across iron and steel families

51/64 in Cobalt Stub Drill Bit

This cobalt stub drill bit meets Aerospace Standard 907 for demanding industrial use. The 135 degree split point is self-centering and reduces thrust during drilling. Short rugged construction suits portable or machine drilling in iron and steel families. It is built for automotive and construction professionals.

Capacity limited to 51/64 inch diameter

The bit handles a broad range of ferrous materials with its cobalt construction and heavy duty design. Performance runs out beyond the 51/64 inch size where standard 118 degree points apply instead. Smaller sizes below 1/16 inch also use the 118 degree standard point. This specific diameter sits within the split point range for optimal centering.

Fits tight spindle clearance setups

The stub length design works in screw machine setups where spindle clearance is limited. No special chuck or adapter is required beyond standard tool holding. It frees up space in confined drilling stations compared to longer jobber bits. California Proposition 65 warnings apply for cancer and reproductive harm risks.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $50.99
Pricier than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Will this 51/64 in cobalt stub drill bit fit in the same chuck as my older 1/2 in drill bits?

The 51/64 in diameter is larger than 1/2 in, so it needs a chuck that opens at least that wide; check your drill's maximum capacity before use.

How can I confirm the 135° split point is self-centering correctly after I start drilling?

The bit should start on contact without a centre punch and produce a clean, centred hole with reduced thrust in iron or steel.

Does the box include any lubricant or cutting fluid for the cobalt bit?

Only the stub drill bit is supplied; cutting fluid or lubricant must be purchased separately.

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