Chicago-latrobe 70229 Jobber Drill Bit 29/64 in Hss Tin

Product Description

The CHICAGO-LATROBE 70229 is a jobber-length twist drill bit designed for general-purpose metal drilling in production and maintenance applications. Built from high speed steel with a titanium nitride (TiN) coating, it offers increased surface hardness and wear resistance compared to uncoated HSS bits. The 118-degree standard point angle suits a wide range of common metals and is the go-to geometry for most shop and field drilling setups. At 5-5/8 inches overall length with a 4-3/16-inch flute length, it fits standard drill chucks and drill presses without modification. The web-thinned, tapered web design reduces thrust and improves chip clearance during cut entry. Machinists, fabricators, and maintenance technicians will find this bit well-suited to everyday ferrous and non-ferrous drilling tasks.

The 70229 is intended for drilling cast iron and steel in residential, commercial, and light industrial settings. It is equally at home in a hand-held drill, a drill press, or a CNC drilling setup running general-purpose feeds and speeds. The right-hand spiral flute and straight-cylindrical shank make it directly compatible with standard three-jaw chucks and quick-change systems. This bit carries the Series 150T designation and meets DIN 338 standards, making it a recognized benchmark geometry for jobber-length drill bits across the trade.

Key Features

• Titanium nitride (TiN) coating increases hardness and extends cutting life on ferrous materials
• 118-degree standard point angle suits cast iron, mild steel, and general-purpose drilling
• Web-thinned, tapered web reduces entry thrust and improves chip evacuation
• Right-hand cut with regular spiral flute for reliable chip clearing in through-hole drilling
• Straight-cylindrical shank at 29/64 inches diameter fits standard drill chucks without adapters
• Meets DIN 338 jobber-length standard for consistent geometry and fitment

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck or quick-change system accepting a straight-cylindrical shank in the 29/64-inch diameter range. Primary workpiece materials are cast iron and steel per manufacturer specification.

Installation Notes

Install and remove drill bits only with the drill or press powered down and any rotating spindle fully stopped. Secure the shank firmly in the chuck and verify concentricity before starting the cut. No coolant-through capability is present on this bit; apply cutting fluid externally when drilling steel at higher feed rates to extend tool life. Always wear appropriate eye protection when operating drilling equipment.