Chicago-latrobe 48406 Screw Machine Drill Bit 0.1065 in

Product Description

The CHICAGO-LATROBE 48406 is a screw machine length drill bit designed for high-volume drilling in cast iron and steel. Built from high speed steel with a coated finish, it carries a 135-degree split point that reduces walking and lowers thrust requirements at the start of each hole. The web-thinned, parallel-web construction keeps cutting forces manageable through the full stroke. At 0.1065 inches in diameter (Wire Size 36), this bit fits short-reach drilling applications where stub-length rigidity is required. Licensed HVAC, plumbing, and mechanical contractors reach for screw machine bits when drilling in tight spaces or working on drill press and CNC turret setups.

This bit is suited for production drilling in residential and commercial mechanical trades wherever cast iron or steel stock is encountered. Typical applications include drilling bolt clearance holes, tap pilot holes, and sheet-metal penetrations in structural steel and cast iron fittings. The short overall length of 1-13/16 inches and flute length of 13/16 inches make it a practical choice for sheet metal shops, fabrication benches, and field service work where a full-length drill bit would flex or chatter.

Key Features

• 135-degree split point reduces center-walking and lowers feed force on hard materials
• Web-thinned parallel web maintains cutting efficiency through the full flute length
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Screw machine (stub) length delivers increased rigidity and reduced deflection in short-reach setups
• Right-hand spiral flute clears chips efficiently during through-hole drilling
• Diameter tolerance of plus 0.0000 to minus 0.0005 inches meets NAS 907 specification requirements

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard straight-shank drill chucks on drill presses, CNC turrets, and hand-held power drills. Primary workpiece materials are cast iron and steel per Series 2159 specifications.

Installation Notes

Installation should be performed by machinists, fabricators, or trade professionals familiar with drill press and rotary tool operation. Secure the straight-cylindrical shank fully in the chuck before drilling and confirm chuck key removal prior to starting the spindle. Select feed rate and RPM appropriate for the workpiece material to avoid overheating the cutting edges. Do not force or side-load the bit, as screw machine length bits are optimized for axial feed only.