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Cobalt jobber drill bit, 31/64 inch, 135 degree split point, straw bronze finish

Chicago-Latrobe

Chicago-Latrobe 47731 135° Cobalt Jobber Drill 31/64

SKU CH-NNZ7-3XZYY

A 135° split-point cobalt jobber drill bit sized 31/64 in with a 0.4844 decimal equivalent

  • Product typeDrill Bits
  • Main materialHAWA
  • 135° split point reduces walking on hard materials
  • Cobalt construction resists heat during extended drilling
  • Jobber length fits standard drill chucks
  • 31/64 inch size matches common fractional specifications
  • Straw bronze finish identifies cobalt grade visually

Chicago-Latrobe 31/64 Cobalt Drill Bit

The Chicago-Latrobe 47731 is a jobber-length drill bit made from cobalt steel for drilling hard metals. It suits maintenance technicians and metal fabricators who need a durable bit for stainless steel and high-strength alloys.

135 Degree Split Point Limits

The 135 degree split point reduces walking on hard surfaces but requires sufficient feed pressure to engage properly. The fractional 31/64 inch size leaves no room for metric tolerance adjustments in tight fits. Cobalt construction resists heat yet remains brittle if the workpiece shifts during drilling.

Straight Shank Installation Notes

The straight shank fits standard three-jaw chucks without adapters. Users must secure the workpiece firmly because the split point can catch on uneven surfaces. The straw bronze finish signals proper heat treatment but offers no corrosion protection in wet environments.

How it compares

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

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

Is the 31/64 inch size the right jobber drill for my 0.4844 inch hole?

Yes, the 31/64 inch fractional size has a decimal equivalent of .4844 inches, matching that exact hole diameter.

How does the 135 degree split point perform when drilling into hard metal?

The 135 degree split point reduces walking and starts cutting immediately, which helps when drilling tough materials with the cobalt construction.

Does the straight shank fit a standard 1/2 inch drill chuck?

The 31/64 inch shank diameter is slightly under 1/2 inch, so it fits securely in a standard 1/2 inch capacity drill chuck.

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