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Silver 5/16 inch left-hand screw machine drill bit with 118 degree point

Chicago-Latrobe

Chicago-Latrobe 48920 Screw Machine Drill Bit 5/16 in 118 Degrees Left Hand

SKU CH-GA7M-N464A

Left-hand screw-machine bit drills 5/16 in holes at 118 degrees in high-speed steel

  • TypeDrill Bits
  • Left-hand cutting removes broken fasteners without tightening them
  • 118-degree point angle centres quickly in metal and plastic
  • High-speed steel construction resists wear during repetitive drilling
  • Bright uncoated finish allows easy inspection of cutting edges
  • Decimal size .3125 in matches 5/16 in specifications exactly

Screw Machine Drill Bit 5/16 Inch

This Chicago-Latrobe drill bit is a high-speed steel cutting tool designed for screw machine applications. Its 5/16 inch diameter and left-hand cutting direction suit specific machining operations. The bright, uncoated finish provides a standard surface for general-purpose drilling tasks. Machinists requiring left-hand rotation will find this bit appropriate.

118 Degree Point Angle Limitation

The conventional 118-degree point angle offers a standard cutting profile for general materials. This geometry may not be optimal for very hard or abrasive workpieces where a split point or different angle performs better. The lack of coolant-through capability requires external lubrication for deep holes or tough alloys. Users drilling stainless steel or high-temperature alloys should evaluate if this point geometry meets their needs.

Left Hand Cutting Direction Decides Fit

The left-hand cutting direction is the critical specification determining compatibility with your equipment. This bit only operates correctly in spindles or drivers providing counter-clockwise rotation. Standard right-hand drill chucks and typical portable drills cannot use this tool effectively. Verify your machine rotation direction before purchase to avoid a mismatch.

Highlights

  • Left-hand cutting removes broken fasteners without tightening them
  • 118-degree point angle centres quickly in metal and plastic
  • High-speed steel construction resists wear during repetitive drilling
  • Bright uncoated finish allows easy inspection of cutting edges
  • Decimal size .3125 in matches 5/16 in specifications exactly

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits

Questions about this item

Should I choose the 5/16 inch size or a different diameter?

Select the 5/16 inch size when your application requires a 0.3125 inch hole; other diameters are separate items not covered by this listing.

What does the 118 degree point angle mean once the bit is in the drill?

The 118 degree conventional point centres quickly in metal and wood, giving a standard cutting action for general-purpose drilling.

How does the left-hand cutting direction affect use?

Left-hand rotation lets the bit back out of a hole or remove broken fasteners when run in reverse on a suitable drill motor.

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