Chicago-latrobe 70222 Jobber Drill Bit 11/32 in Hss Tin

Product Description

The CHICAGO-LATROBE 70222 is a jobber-length twist drill bit built for general-purpose drilling in steel, cast iron, and similar ferrous materials. It is ground from high speed steel and finished with a titanium nitride (TiN) coating that reduces friction and extends tool life compared to uncoated HSS. The bit measures 11/32 inch (0.3438 inch) in diameter with a 118-degree standard point angle, a regular-spiral right-hand flute, and a straight-cylindrical shank. Overall length is 4-3/4 inches with a 3-7/16-inch flute length. It is manufactured to DIN 338 standards and carries a web-thinned, tapered-web point for improved centering on entry. Machinists, maintenance technicians, pipefitters, and electricians routinely carry this size for production drilling and field work.

The 70222 is suited for drilling through mild steel structural members, cast iron housings, and general shop or field fabrication tasks. Its 11/32-inch diameter is commonly used for clearance holes for 5/16-inch fasteners and tapping pilots for 3/8-16 UNC threads. The jobber-length configuration fits standard three-jaw chucks on drill presses, cordless and corded hand drills, and magnetic-base drills without an extension. Series 150T is a general-purpose line intended for everyday production and maintenance drilling where a balanced combination of hardness and toughness is required.

Key Features

• Titanium nitride (TiN) coating reduces friction and increases surface hardness for longer tool life versus bare HSS
• 118-degree standard point angle with web-thinned, tapered-web geometry improves center-starting and reduces thrust
• Right-hand, regular-spiral flute evacuates chips cleanly in steel and cast iron
• Straight-cylindrical shank fits standard drill chucks without adapters
• Manufactured to DIN 338 for consistent diameter tolerance (-0.0010 to 0.0000 inch)
• Two-flute construction balances rigidity and chip clearance for general-purpose drilling

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard keyed or keyless chuck accepting an 11/32-inch straight-cylindrical shank. Primary workpiece materials listed by the manufacturer are cast iron and steel.

Installation Notes

Installation is performed by machinists, maintenance technicians, or trade professionals using a drill press, hand drill, or magnetic-base drill. Secure the shank fully in the chuck jaws before operation and confirm the bit runs true before cutting. Use appropriate cutting fluid or lubricant when drilling steel to preserve coating life and maintain tolerance. Disconnect or de-energize any drilling equipment before changing bits.