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Cobalt jobber drill bit, size 21, 135-degree split point, straw bronze finish

Chicago-Latrobe

Chicago-Latrobe 47755 135 Deg Cobalt Jobber Drill #21 .1590

SKU CH-T554-1XH13

A #21 cobalt jobber drill with a 135-degree split point for hard-metal drilling

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point starts on contact without wandering
  • Cobalt steel resists heat during high-speed drilling
  • Jobber length gives standard reach for general work
  • #21 size equals .1590 decimal for precise holes
  • Heavy-duty construction handles tough materials cleanly

Chicago-Latrobe 47755 Cobalt Jobber Drill

This Chicago-Latrobe 47755 is a heavy-duty cobalt jobber drill bit sized at #21 with a decimal equivalent of .1590. It features a 135-degree split point designed for self-centering and reduced thrust. The straw/bronze finish identifies the cobalt construction intended for hard metal drilling.

Suited for hard steel and alloy work.

Machinists and maintenance technicians drilling tough stainless or high-tensile steels will benefit from the cobalt heat resistance and split-point geometry. Users primarily drilling wood, plastic or soft aluminium will not need this level of hardness and may prefer lower-cost high-speed steel bits.

Standard chuck fit; watch for work hardening

The jobber length shank fits any standard three-jaw drill chuck without adapters. Apply steady feed pressure and cutting fluid to prevent the cobalt edge from chipping; letting the bit dwell in the hole can work-harden stainless steel and make the cut harder.

How it compares

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

Price $1.99
Cheaper than about 98% 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

Does the #21 .1590 drill bit fit a standard 3/8 inch chuck?

Yes, the .1590 inch diameter is well within the capacity of a standard 3/8 inch drill chuck.

Can this cobalt bit drill through hardened steel that regular HSS bits cannot?

The cobalt construction provides higher heat resistance and hardness, allowing it to cut hardened steel and stainless steel more effectively than standard HSS bits.

How can I verify the 135 degree split point is centred before drilling?

Inspect the tip visually; the split point should appear as two symmetrical cutting lips meeting at the exact centre of the .1590 diameter.

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