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Cobalt jobber drill bit, 25/64 inch, 135 degree split point, TiAlN finish

Chicago-Latrobe

Chicago-Latrobe 44925 25/64 in 135 Degree Cobalt Jobber Drill Bit

SKU CH-E4S1-S25K8

A 25/64 inch cobalt jobber drill bit with a 135 degree split point for heavy-duty drilling

  • Product typeDrill Bits
  • 135° split point starts on contact without wandering
  • Cobalt steel resists heat for longer cutting life
  • TiAlN coating reduces friction and extends wear resistance
  • 25/64 in fractional size matches standard jobber requirements
  • Decimal equivalent .3906 in simplifies precise hole planning

Cobalt Jobber Drill Bit

The Chicago-Latrobe 44925 is a fractional-inch jobber-length drill bit made from cobalt steel with a TiAlN coating. It suits machinists and maintenance technicians who need a durable bit for drilling hard metals such as stainless steel and high-temperature alloys. The 135-degree split point reduces walking and improves centring accuracy at the start of the hole. This non-coolant-through design has zero coolant holes.

Sustained Drilling Behaviour

Cobalt construction retains hardness at elevated temperatures generated during extended drilling cycles. The TiAlN coating lowers friction and resists wear when cutting abrasive or work-hardening materials. The 135-degree split point maintains consistent chip formation and reduces thrust force over long production runs. Absence of coolant holes means heat dissipation relies on external flood coolant or peck-drilling cycles.

Fractional Size Constraints

The 25/64 inch diameter (0.3906 decimal equivalent) fixes the hole size for specific bolt or tap sequences. Jobber-length proportions limit reach to standard depths without the rigidity of shorter stub drills or the reach of extended-length variants. The straight shank fits common three-jaw chucks but does not suit quick-change or coolant-through toolholders. Coating performance varies with spindle speed and feed rate.

How it compares

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

Price $21.99
Cheaper than about 60% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits

Questions about this item

How hot does the 135-degree split-point cobalt bit get during prolonged drilling?

Cobalt steel resists heat better than standard high-speed steel, so the bit stays harder longer when run continuously in tough materials.

What shank size does the 25/64-inch jobber bit need to fit my drill?

The bit has a straight 25/64-inch shank that matches its cutting diameter, so it fits any three-jaw chuck that opens to at least .3906 inch.

Will the 44925 bit work in my older 3/8-inch chuck drill?

The shank is .3906 inch, which is slightly larger than a 3/8-inch chuck capacity, so a 1/2-inch or larger chuck is required.

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