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Silver cylindrical twist drill bit with split point tip and black oxide finish

Chicago-Latrobe

Chicago-Latrobe 42780 J 4-1/8" HSS 135 Deg. Jobber Length Drill Bit pneumatic accessory

SKU CH-F9F7-FDGPV

High-speed steel jobber drill bit with 135-degree split point for accurate starts in metal

  • Product typeDrill Bits
  • Main materialHAWA
  • High-speed steel construction resists wear during repeated drilling
  • 135-degree split point starts holes cleanly without wandering
  • TiAlN coating reduces friction and extends cutting life
  • Jobber length suits general-purpose drilling depths
  • Decimal size .2770 matches letter J specification

Chicago-Latrobe 42780 J Drill Bit

The Chicago-Latrobe 42780 J is a high-speed steel jobber length drill bit designed for general-purpose drilling tasks. It suits mechanics, fabricators and maintenance technicians who need a reliable bit for creating precise holes in metal and other materials. The split point design helps reduce walking on contact.

135 Degree Split Point Geometry

The 135 degree split point angle is the critical specification that determines suitability for harder materials. This geometry provides efficient chip ejection and centres the bit without a centre punch. It allows the bit to start cutting immediately on contact with the workpiece surface.

.2770 Inch Capacity and TiAlN Coating

With a decimal equivalent of .2770 inches, this letter size J bit handles standard fastening and clearance holes comfortably. The TiAlN coating extends tool life by reducing friction and heat buildup during repeated use. It runs out when the cutting edges dull beyond resharpening or when the job requires a larger diameter or coolant-fed operation.

How it compares

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

Price $7.99
Cheaper than about 91% 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

What does the 135-degree split point mean when I start drilling?

The 135-degree split point reduces walking and lets the bit self-centre on contact, so you can begin a hole without a centre punch on steel and other hard materials.

How does the TiAlN coating affect the bit's performance in a drill press?

TiAlN increases surface hardness and heat resistance, allowing higher cutting speeds and longer tool life when drilling steel, stainless steel and cast iron in a drill press or hand drill.

What chuck size do I need for the .2770-inch shank?

A standard 3/8-inch or 1/2-inch drill chuck will grip the .2770-inch shank securely; no special collet or adaptor is required.

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