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Cobalt jobber drill bit, 31/64 inch, 135-degree split point, TiN coated

Chicago-Latrobe

Chicago-Latrobe 54074 31/64 in 135 Degree Cobalt Jobber Drill Bit

SKU CH-8W4N-R4951

Cobalt jobber drill bit with 135-degree split point for 31/64 inch holes

  • Product typeDrill Bits
  • Main materialHAWA
  • Cobalt construction resists heat and wear
  • 135-degree split point starts holes without wandering
  • 31/64 inch diameter suits heavy-duty drilling
  • Jobber length provides reach in deep workpieces
  • TiN coating reduces friction for longer life

Chicago-Latrobe 54074 31/64 in Cobalt Drill Bit

This Chicago-Latrobe 54074 jobber-length drill bit has a 31/64 inch diameter and a 135-degree split point. It is made from cobalt steel with a TiN coating for hardness and wear resistance. The decimal equivalent is .4844 inches. It suits professional and serious DIY drilling tasks.

For machinists drilling hard metals.

The cobalt construction and 135-degree angle excel in stainless steel, cast iron and other tough alloys. The split point reduces walking on hard surfaces. Buyers who only drill soft wood or plastic will not need this level of heat resistance and can choose a less specialised bit.

31/64 inch diameter with 135-degree split point

The 31/64 inch size (.4844 decimal) determines the hole diameter this bit produces. The 135-degree split point geometry allows starting on contact without a centre punch in hard materials. Verify that your chuck capacity and the required hole size match this exact fraction before ordering.

How it compares

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

Price $20.99
Cheaper than about 62% 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

What does the 31/64 inch size mean when I chuck this bit in a drill?

The 31/64 inch diameter equals 0.4844 inch, so the bit cuts a hole of that exact width in the workpiece.

How does the 135 degree split point affect drilling performance?

The 135 degree split point centres the bit on contact and reduces walking, letting it start cleanly in hard materials such as stainless steel.

What shank style does this jobber bit have for mounting in a chuck?

It uses a straight round shank the same diameter as the flute, fitting any standard three-jaw drill chuck that accepts 0.4844 inch capacity.

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