Chicago-latrobe 49382 Screw Machine Drill Bit 0.189 in

Product Description

The CHICAGO-LATROBE 49382 is a screw machine length drill bit designed for heavy-duty drilling in cast iron and steel. It measures 0.189 inches in diameter (Wire Size 12) with an overall length of 2.25 inches and a flute length of 1.1875 inches. The bit is manufactured from high speed steel with a coated finish and features a 135-degree split point for fast penetration and reduced walking on entry. The shortened screw machine length body provides added rigidity in drill press, turret lathe, and screw machine applications where stub-length tools are required. Licensed trades and machining shops are the primary installers.

This bit is suited for production drilling operations in residential and commercial fabrication, mechanical contracting, and maintenance environments. Its heavy-duty grade and web-thinned parallel web construction make it appropriate for repetitive through-hole and blind-hole work in ferrous metals including cast iron and steel. The right-hand spiral flute geometry clears chips efficiently in these materials. Series 159 is a recognized production-grade line built to NAS 907 and ISO standards, making it a common choice for shops that specify controlled-tolerance tooling.

Key Features

• 135-degree split point reduces thrust and prevents bit walking on entry
• Web-thinned parallel web improves chip evacuation in ferrous materials
• Screw machine length body increases rigidity over jobber-length bits
• High speed steel construction with coated finish for extended service life
• Diameter tolerance held to +0.0000 to -0.0007 inches for consistent hole sizing
• Built to NAS 907 and ISO standards for production and controlled-tolerance applications

Compatibility

Designed for drilling cast iron and steel in screw machine, turret lathe, and drill press setups where a stub-length, straight-cylindrical shank bit is required. Fits standard chucks accepting a 0.189-inch straight-cylindrical shank.

Installation Notes

Install in a properly rated drill chuck and verify chuck tightness before operation. Use cutting fluid appropriate for the workpiece material when drilling steel or cast iron to manage heat and extend bit life. Do not exceed the rated speed range for the bit diameter in the applicable machinery manual. Inspect the cutting edges and coating before each use and replace the bit if chipping or excessive wear is observed.