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Silver left-hand twist drill bit 31/64 inch high speed steel bright finish

Chicago-Latrobe

Chicago-Latrobe 48931 Screw Machine Drill LH 31/64 in High Speed Steel

SKU CH-PD3X-D34AQ

Left-hand screw-machine drill bit in high-speed steel, 31/64 in diameter with 118-degree point for general-purpose drilling

  • TypeDrill Bits
  • Left-hand rotation clears chips in reverse drilling
  • High-speed steel construction resists heat during heavy cuts
  • 118° drill point centres quickly without walking
  • 31/64 in fractional size matches precise hole specs
  • Bright finish reduces friction for smoother chip flow

Chicago-Latrobe 48931 Screw Machine Drill LH

This Chicago-Latrobe 48931 is a left-hand screw machine drill bit made from high speed steel with a bright finish. It has a fractional size of 31/64 inch and a decimal equivalent of .4844 inch. The drill point angle is 118 degrees and the overall length is 3-11/16 inches. It is supplied as a single piece for general purpose drilling applications.

Machinists needing left-hand rotation for screw

This bit suits machinists who require a left-hand cutting direction for removing broken fasteners or for specific screw machine operations. The 118 degree point and high speed steel construction serve general purpose drilling in a variety of materials. Buyers needing a right-hand cutting drill bit for standard hole making should select a different list number.

31/64 inch fractional size with 118 degree point

The decisive specification is the 31/64 inch fractional diameter combined with the 118 degree drill point angle. This determines the hole size produced and the material suitability for general purpose work. The shank diameter matches the drill diameter at .4844 inch for use in compatible tool holders. Verify the required fractional size and point angle before purchase.

Highlights

  • Left-hand rotation clears chips in reverse drilling
  • High-speed steel construction resists heat during heavy cuts
  • 118° drill point centres quickly without walking
  • 31/64 in fractional size matches precise hole specs
  • Bright finish reduces friction for smoother chip flow

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits

Questions about this item

Should I pick the 31/64 inch size or a different fractional diameter?

Choose 31/64 in when the hole must be 0.4844 in; other fractional sizes will not match that target.

What does the 118-degree drill point mean when the bit is in the machine?

The 118-degree point centers quickly in general-purpose materials and reduces walking on flat surfaces.

How does the straight shank at 0.4844 in limit what chucks I can use?

The shank diameter matches the 31/64 in cutting size, so it fits any three-jaw chuck that opens to at least 0.4844 in.

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