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Bright uncoated solid carbide straight flute drill bit 5/16 inch 140 degree point

Chicago-Latrobe

Chicago-Latrobe 78604 140 Degree Solid Carbide Straight Flute Drill 5/16 in

SKU CH-WSS2-XC6SP

A solid-carbide straight-flute drill with a 140-degree point cuts 5/16 in holes in hardened materials

  • TypeCutting Tools
  • 140-degree point angle centres the drill instantly
  • Solid carbide construction resists wear in abrasive materials
  • Bright uncoated finish allows easy resharpening
  • 4-facet point geometry reduces thrust force
  • Straight flute design clears chips efficiently

Chicago-Latrobe 78604 Solid Carbide Drill

The Chicago-Latrobe 78604 is a straight-flute drill bit made from solid carbide for machine shops and maintenance crews drilling hardened steels and abrasive alloys. Its 140-degree point angle and four-facet grind reduce walk and improve centring on rigid setups. The bright uncoated finish suits general-purpose machining where coolant is available.

Uncoated Bright Finish and Four-Facet Point

The bright finish eliminates coating cost and allows easy resharpening on a tool grinder without stripping a layer first. The four-facet point geometry creates a self-centring action that cuts chatter on through-holes and improves hole straightness in deep cuts. No bundled accessories or software are included with this cutting tool.

Standard Shank Fits Common Collets and Chucks

The fractional 5/16 inch shank seats directly in standard ER collets, drill chucks and hydraulic holders without adapters. Carbide brittleness demands rigid clamping and constant flood coolant; run-out or pecking without lubrication causes corner chipping. Resharpening requires a diamond wheel and proper relief angles to restore the 140-degree point.

Highlights

  • 140-degree point angle centres the drill instantly
  • Solid carbide construction resists wear in abrasive materials
  • Bright uncoated finish allows easy resharpening
  • 4-facet point geometry reduces thrust force
  • Straight flute design clears chips efficiently

Specifications

BrandCHICAGO-LATROBE
TypeCutting Tools

Questions about this item

When will the uncoated carbide cutting edges need resharpening or replacement?

The bright uncoated finish on the solid carbide body will show wear first; plan to resharpen the four-facet point once hole quality drops, as no coating extends edge life.

What limits continuous drilling in steel with the 140-degree point angle?

Chip evacuation through the straight flutes becomes the bottleneck during sustained cuts; the 1 5/8 in flute length fills quickly, forcing frequent peck cycles.

How much heat builds up in the 5/16 in shank during all-day CNC runs?

Solid carbide conducts heat rapidly into the holder, so the .3125 in shank runs hot; use flood coolant and keep dwell times short to protect the tool holder.

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