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Black oxide high-speed steel drill bits in metal index case

Chicago-Latrobe

Chicago-Latrobe 69852 21PC 135 Degree Screw Machine Length Drill Bit Set

SKU CH-BC1T-T7Z1N

21-piece fractional high-speed steel drill bit set with 135-degree split points and black-oxide finish for screw-machine-length drilling

  • TypeDrill Bits
  • 21-piece set covers common fractional sizes from 1/16 in to 3/8 in
  • 135-degree split point reduces walking and starts holes cleanly
  • Screw machine length gives rigidity for portable and bench drilling
  • High-speed steel with black oxide resists wear and corrosion
  • Supplied in indexed case for quick size selection and organisation

21-Piece Split-Point Drill Set

This 21-piece set from Chicago-Latrobe supplies fractional-inch screw-machine-length bits ranging from 1/16 in to 3/8 in. The 135-degree split-point geometry is designed to start on contact and reduce walking. High-speed steel with a black-oxide finish adds wear resistance for general-purpose drilling.

Screw-Machine Length for Tight Spaces

The shorter screw-machine length keeps the bit rigid and lets it reach into confined work areas where jobber-length bits cannot fit. Each bit fits a standard three-jaw chuck, so no special holders or adapters are required. The indexed case organises every size for quick selection and protects the cutting edges during storage.

For Metalworkers Needing a Compact Range

Machinists, maintenance technicians and fabricators who drill steel, cast iron or non-ferrous alloys will appreciate the split-point start and the broad fractional spread. Woodworkers or masonry specialists should look elsewhere because the geometry and material are optimised for metal cutting, not for clean wood holes or concrete.

Highlights

  • 21-piece set covers common fractional sizes from 1/16 in to 3/8 in
  • 135-degree split point reduces walking and starts holes cleanly
  • Screw machine length gives rigidity for portable and bench drilling
  • High-speed steel with black oxide resists wear and corrosion
  • Supplied in indexed case for quick size selection and organisation

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits

Questions about this item

How does the 135-degree split-point geometry affect drilling accuracy during repeated use?

The 135-degree split-point geometry centres the bit on contact and reduces walking, so each hole starts where you place it without needing a centre punch.

What heat build-up should I expect when running these high-speed steel bits continuously in a drill press?

High-speed steel retains hardness at the temperatures reached in normal screw-machine drilling; black-oxide finish helps dissipate heat and resists galling.

Which chuck capacity do I need on my drill press or hand drill to hold every bit in this 21-piece fractional set?

The largest bit is 3/8 in, so a 3/8 in or larger three-jaw chuck will secure every size from 1/16 in up.

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