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Silver cylindrical twist drill bit with 135-degree split point and gold TiCN coating near shank

Chicago-Latrobe

Chicago-Latrobe 43629 135 Degree Heavy-Duty Jobber Length Drill Bit 29/64 in

SKU CH-3GQS-XQ4Y3

Heavy-duty jobber drill bit with 135-degree split point for 29/64 inch holes in high-speed steel with TiCN coating

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point starts drilling on contact
  • 29/64-inch diameter matches precise fractional sizing
  • High-speed steel with TiCN coating resists wear
  • Jobber length reaches standard drilling depths
  • Non-coolant design simplifies everyday workshop use

Chicago-Latrobe 43629 29/64 in Jobber Drill Bit

This Chicago-Latrobe drill bit is a jobber length twist drill sized at 29/64 inch with a decimal equivalent of .4531. It is manufactured from high speed steel and finished with a TiCN coating. The 135 degree split point design allows the bit to start accurately without a centre punch. The tool is intended for general-purpose drilling in metal, wood and plastic where a standard jobber length is appropriate.

Thermals noise and power draw in normal use

The bit generates heat through friction during drilling; cutting fluid or oil reduces temperature and extends edge life. Noise level depends on the drill motor, workpiece material and clamping rigidity rather than the bit itself. Power draw is determined by the drill motor and the feed pressure applied by the operator. No coolant holes are present so external lubrication is required for deep holes.

Bundled accessories and software

The product is supplied as a single drill bit with no additional accessories, cases or software. The TiCN coating increases surface hardness and reduces friction compared with an uncoated high speed steel bit. This change improves wear resistance and allows higher cutting speeds in ferrous materials. No driver bits, pilot drills or digital content are included.

How it compares

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

Price $17.99
Cheaper than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

How do I install the Chicago-Latrobe 43629 drill bit in my drill chuck, and what step do people often get wrong?

Insert the 29/64 in shank fully into the chuck jaws and tighten securely. The common mistake is not seating the bit completely, which causes run-out and premature wear on the 135 degree split point.

What maintenance or replacement will the Chicago-Latrobe 43629 drill bit need over time?

The TiCN-coated high-speed steel cutting edges will dull with use. Resharpen the 135 degree split point geometry when drilling performance drops, or replace the bit if the cutting lips are chipped or the 0.4531 in diameter wears undersize.

What limit appears first on the Chicago-Latrobe 43629 drill bit during sustained drilling?

Heat buildup at the 135 degree split point is the primary limit. The non-coolant-through design with zero coolant holes means chips and heat are not evacuated internally, so cutting speed must be reduced to prevent the TiCN coating from degrading.

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