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Black metal case holding twenty-nine bright steel drill bits in fractional sizes

Chicago-Latrobe

Chicago-Latrobe 69900 29PC 118 Degree Screw Machine Drill Bit Set

SKU CH-JXS9-NNCM4

29-piece high-speed steel screw machine length drill bit set with 118-degree conventional points covering fractional sizes from 1/16 to 1/2 inch

  • TypeDrill Bits
  • 29-piece set covers common fractional sizes from 1/16 to 1/2 inch
  • 118-degree conventional point starts cleanly without walking
  • High-speed steel construction resists wear in steel and wood
  • Bright uncoated finish allows easy resharpening
  • Screw-machine length provides rigidity for portable drilling

Professional 29-piece drill bit set

The Chicago-Latrobe 69900 set contains 29 fractional-inch drill bits ranging from 1/16 in to 1/2 in. Each bit is made from high-speed steel with a bright uncoated finish. The conventional 118-degree point angle suits general-purpose drilling in metal, wood and plastic. Machinists and maintenance technicians will find the full range covers most common screw-machine lengths.

Upgrading from limited fractional sets

Smaller kits often skip the intermediate 64th-inch sizes such as 11/64 in, 13/64 in or 29/64 in. This set fills those gaps so you can match tap-drill charts without hunting for individual bits. The jump is worth it when a job requires precise clearance or thread-fit holes that fall between the standard 32nd-inch increments.

Sustained drilling in production runs

High-speed steel holds its edge through repeated holes in mild steel and aluminium when feed and speed are kept consistent. The bright finish allows coolant to cling and flush chips from the flutes during long cycles. Without a coating to wear away, the bits can be resharpened multiple times, extending service life in a busy shop.

Highlights

  • 29-piece set covers common fractional sizes from 1/16 to 1/2 inch
  • 118-degree conventional point starts cleanly without walking
  • High-speed steel construction resists wear in steel and wood
  • Bright uncoated finish allows easy resharpening
  • Screw-machine length provides rigidity for portable drilling

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits

Questions about this item

What size drill chuck is required for the 1/2 in bit in this 29-piece set?

The largest bit measures 1/2 in, so a chuck capacity of at least 1/2 in is needed to hold it securely.

Which bit should I start with when drilling a 1/2 in hole to avoid breaking the larger bits?

Begin with a smaller pilot bit such as the 1/4 in or 17/64 in size before stepping up to the final 1/2 in diameter.

How can I extend the life of the uncoated high-speed steel bits when drilling steel?

Use cutting fluid, keep the drill speed moderate, and sharpen the 118-degree conventional points when they dull.

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