Chicago-latrobe 70203 Jobber Drill Bit 3/64 in Hss Tin

Product Description

The CHICAGO-LATROBE 70203 is a jobber-length twist drill bit designed for general-purpose drilling in metal fabrication, maintenance, and light production environments. Ground from high speed steel and finished with a titanium nitride (TiN) coating, it delivers extended cutting life compared to uncoated HSS bits. The 118-degree standard point angle suits a broad range of common workpiece materials. At 1.75 inches overall length with a 0.375-inch flute length, this is a compact bit sized for tight-clearance work or use in standard drill chucks and rotary tools. Licensed tradespeople and skilled shop technicians are the primary users.

The 70203 is suited for drilling cast iron and steel in residential and light commercial service work, fabrication shops, and mechanical rooms. The right-hand spiral flute geometry efficiently clears chips during through-hole and blind-hole operations. The straight-cylindrical shank, measuring 0.0469 inches in diameter, seats securely in standard keyless or keyed drill chucks. This bit conforms to DIN 338 dimensional standards, making it a consistent, predictable choice for repetitive drilling tasks across trade and industrial settings.

Key Features

• Titanium nitride (TiN) coating increases surface hardness and reduces friction for longer tool life
• 118-degree standard point angle for general-purpose drilling in cast iron and steel
• Web-thinned, tapered web construction reduces thrust force at the cutting tip
• Right-hand, regular spiral flute for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to DIN 338 for consistent dimensional tolerances

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard keyed and keyless drill chucks accepting a 0.0469-inch straight-cylindrical shank. Primary workpiece materials are cast iron and steel.

Installation Notes

Secure the shank fully in the chuck before drilling and verify runout before production use. Always wear appropriate eye protection when operating rotary cutting tools. Use cutting fluid or coolant when drilling steel to manage heat buildup and preserve coating integrity. Replace the bit if the cutting edge shows chipping or if the TiN coating is worn through at the tip, as a damaged edge increases thrust load and reduces hole quality.