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Chicago-Latrobe 45640 29-piece black oxide drill bit set in metal case

Chicago-Latrobe

Chicago-Latrobe 45640 29PC 135 Degree Heavy-Duty Jobber Length Drill Set pneumatic accessory

SKU CH-TDD0-AP84W

29-piece high-speed steel drill bit set with 135-degree points and black oxide finish for heavy-duty jobber length drilling

  • Product typeDrill Bits
  • 29-piece set covers common drilling tasks
  • 135-degree split point reduces walking on hard materials
  • High-speed steel construction withstands heavy-duty use
  • Black oxide finish resists corrosion and wear
  • Jobber length suits general-purpose drilling depth

Chicago-Latrobe 45640 Drill Set

This 29-piece drill bit set from Chicago-Latrobe delivers a comprehensive range of jobber-length bits for general-purpose drilling. It suits mechanics, fabricators and maintenance crews who need a ready-to-hand assortment in a single package.

135-Degree Point and Black Oxide Finish

The 135-degree split point reduces walking on contact and starts holes cleanly without a centre punch. Black oxide coating adds lubricity and resists corrosion, extending bit life when cutting steel, cast iron and other ferrous metals.

High-Speed Steel Construction

Each bit is ground from high-speed steel, the material that determines whether the set withstands the heat and abrasion of daily shop use. Buyers needing cobalt, carbide or coated bits for stainless steel or high-temperature alloys should look elsewhere.

How it compares

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

Price $111.99
Pricier than about 85% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits

Questions about this item

Will the 135-degree split point on the high-speed steel bits need regrinding after repeated use?

The 135-degree split point is ground into the high-speed steel and can be resharpened when it dulls, extending the life of each bit in the 29-piece set.

Which component reaches its limit first when drilling continuously through hard steel?

The black oxide finish on the high-speed steel bits wears away first under sustained high-speed drilling, exposing the raw steel to heat and accelerated wear.

How much heat do the black oxide high-speed steel bits generate during all-day drilling?

The black oxide coating reduces friction and helps dissipate heat, but extended heavy-duty use will still raise bit temperature enough to require cutting fluid or cooling pauses.

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