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Cobalt steel screw machine drill bit size 29 135 degree split point straw finish

Chicago-Latrobe

Chicago-Latrobe 50884 Cobalt Screw Machine Drill #29 135° .1360

SKU CH-FJP3-04XQS

Cobalt steel drill bit sized #29 with a 135-degree split point for precision drilling at .1360 inch diameter

  • Product typeDrill Bits
  • Main materialCobalt Steel
  • Cobalt steel resists heat during high-speed drilling
  • 135° split point starts accurately without wandering
  • Size #29 delivers .1360 inch hole diameter
  • Right-hand cutting direction suits standard drill chucks
  • Straw finish identifies cobalt material at a glance

Chicago-Latrobe Cobalt Drill Bit #29

The Chicago-Latrobe 50884 is a screw machine drill bit made from cobalt steel for hardness and heat resistance. It carries a 135 degree split point that helps it start cleanly in tough materials. The decimal equivalent is .1360 inches. Right-hand cutting direction suits standard drill chucks.

For machinists drilling hard alloys

This bit suits operators who need a durable cobalt tool for stainless steel, titanium or high tensile alloys where standard high speed steel wears quickly. It is not intended for wood, plastic or soft aluminium where a sharper point angle would cut faster. Buyers who need a coolant-through shank or a left-hand cutting direction should look elsewhere.

135 degree split point geometry

The 135 degree split point is the specification that determines whether this drill matches the application. It reduces walking on hard surfaces and lowers thrust compared with a conventional point. If the job calls for a different point angle or a non-split tip, this bit will not perform as required.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $1.99
Cheaper than about 98% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialCobalt Steel

Questions about this item

How often will the #29 cobalt bit need resharpening or replacement under normal use?

The cobalt steel holds its edge longer than standard high-speed steel, so resharpening intervals are extended; replace the bit once the split point wears down and hole quality drops.

What is the first limit reached when drilling continuously with the 135° split point?

Chip evacuation becomes the limiting factor in deep holes; the non-coolant-through design means heat builds up faster than the straw finish can dissipate it.

How much heat and noise does the .1360 drill generate during all-day production runs?

Cobalt steel runs hotter than carbide but cooler than HSS; expect moderate heat at the shank and typical high-pitched drilling noise — use cutting fluid to manage both.

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