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Cobalt jobber drill bit, 10.5 mm, straw bronze finish, split point

Chicago-Latrobe

Chicago-Latrobe 46490 135° Cobalt Jobber Drill 10.5 mm

SKU CH-YCWH-SKBAC

A 10.5 mm cobalt jobber drill with a 135° split point for hard-metal drilling

  • TypeDrill Bits
  • MaterialHAWA
  • 135° split point starts on contact for accurate holes
  • Cobalt steel resists heat and wear in tough metals
  • 5 mm diameter suits metric fastening jobs
  • Jobber length gives standard reach for general drilling
  • Straw bronze finish reduces friction and chip welding

10.5 mm Cobalt Jobber Drill

The Chicago-Latrobe 46490 is a 10.5 mm cobalt jobber-length drill bit built for heavy-duty metal cutting. Its 135-degree split point reduces walking and starts holes cleanly in tough alloys. Machinists and maintenance technicians working with stainless steel or high-tensile materials will find it suited to daily production drilling.

Split-point geometry and cobalt construction

The split-point tip centres the bit without a centre punch, saving set-up time on repetitive jobs. Cobalt alloy resists heat buildup better than standard high-speed steel, extending edge life when drilling deep or at higher speeds. The straw-bronze surface finish signals the heat-treatment grade and aids chip evacuation in blind holes.

Upgrading from general-purpose HSS bits

Shops replacing black-oxide or bright-finish HSS jobbers gain longer tool life and fewer regrinds on abrasive workpieces. The jump is worth it when hole counts rise or material hardness pushes standard bits past their limit. It does not suit non-metallic materials or applications requiring through-coolant delivery.

Highlights

  • 135° split point starts on contact for accurate holes
  • Cobalt steel resists heat and wear in tough metals
  • 5 mm diameter suits metric fastening jobs
  • Jobber length gives standard reach for general drilling
  • Straw bronze finish reduces friction and chip welding

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits
MaterialHAWA

Questions about this item

What does the 135° split point on the 46490 drill bit do?

The 135° split point centres the bit without a pilot hole and reduces walking on hard materials such as stainless steel.

What shank size does the 10.5 mm jobber drill have?

The shank matches the 10.5 mm drill diameter so it fits any 10.5 mm or 3/8" three-jaw chuck.

How is the cobalt jobber bit installed in a drill press?

Insert the straight shank fully into the chuck, tighten all three jaws evenly, and verify the bit runs true before drilling.

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