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Cobalt drill bit set in metal case, 15 pieces, straw finish

Chicago-Latrobe

Chicago-Latrobe 69856 Cobalt Screw Machine Bit Set 15 Pc

SKU CH-25DB-0RRH4

15-piece cobalt screw-machine drill bit set with 135-degree split points covering fractional sizes from 1/16 to 1/2 inch

  • TypeDrill Bits
  • Cobalt construction resists heat and wear
  • Split-point tip starts on contact without wandering
  • 135-degree point angle cuts efficiently in hard metals
  • 15-piece fractional set covers 1/16 in to 1/2 in
  • Straw finish identifies cobalt grade at a glance

Cobalt 15-piece screw-machine set

This Chicago-Latrobe 69856 set supplies fifteen cobalt drill bits built for screw-machine work. The split-point geometry at 135 degrees reduces walking and cuts cleanly in harder alloys. Fractional inch sizes range from 1/16 in up to 1/2 in across the full count. It suits maintenance shops and production cells that need repeatable hole quality.

Fractional inch range and split-point limit

The smallest bit is 1/16 in and the largest is 1/2 in, so holes outside that span need separate tooling. Split-point tips help start on curved or hardened surfaces but do not replace a centre drill for deep precision work. Cobalt withstands heat better than high-speed steel yet still dulls if feed and speed are mismatched. The set covers common fractional steps only.

Cobalt material for heat resistance

Cobalt alloy retains hardness at the temperatures generated in stainless steel, titanium and high-nickel alloys. Buyers drilling mainly mild steel or aluminium may find standard high-speed steel bits more economical. The 135-degree point is fixed and cannot be re-ground to a different angle without special equipment. Shops needing metric sizes or lengths beyond the standard screw-machine stub must look elsewhere.

Highlights

  • Cobalt construction resists heat and wear
  • Split-point tip starts on contact without wandering
  • 135-degree point angle cuts efficiently in hard metals
  • 15-piece fractional set covers 1/16 in to 1/2 in
  • Straw finish identifies cobalt grade at a glance

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits

Questions about this item

How do I choose between the 15-piece set and smaller options?

This 15-piece set covers fractional sizes from 1/16 in to 1/2 in, including 11/32 in, 13/32 in and 15/32 in, so one kit handles the full range of common screw-machine drilling tasks.

What does the 135-degree split point do on the bench?

The 135-degree split point starts holes without wandering and reduces thrust, letting the cobalt bits cut cleanly in hard metals such as stainless steel.

What shank standard do these bits use and what chuck does it fit?

Each bit has a straight fractional-inch shank matching its drill diameter, so they clamp directly in any standard three-jaw drill chuck up to 1/2 in capacity.

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