Chicago-latrobe 48250 Screw Machine Drill Bit 0.348 in

Product Description

The CHICAGO-LATROBE 48250 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it delivers extended tool life under demanding shop conditions. The 135-degree split point reduces walking and lowers thrust requirements at the start of the cut. At 3-1/16 inches overall length and a 0.348-inch diameter, this bit fits the compact reach requirements typical of screw machine and turret lathe work. Two spiral flutes with web thinning clear chips efficiently and reduce heat buildup during continuous operation.

This bit is suited for production machining environments where tight tolerances and consistent performance are required. The straight-cylindrical shank seats securely in drill chucks and quick-change toolholders. Primary workpiece materials are cast iron and steel. The Series 2159 heavy-duty designation indicates this bit is built for repetitive, high-cycle drilling rather than occasional use. It is commonly found in machine shops, job shops, and industrial maintenance settings where screw machine length tooling is standard.

Key Features

• 135-degree split point reduces thrust and minimizes bit walking on entry
• Web-thinned, parallel web configuration improves chip evacuation
• High speed steel construction with coated finish for extended tool life
• Right-hand cut with regular spiral flutes for cast iron and steel applications
• Screw machine length body for use in close-clearance and production setups
• Meets NAS 907 and ISO standards for dimensional and performance consistency

Compatibility

Designed as a direct-fit replacement for screw machine length drill bits in the 0.300 to 0.350 inch diameter range; fits standard drill chucks and quick-change toolholders that accept straight-cylindrical shanks.

Installation Notes

Installation is performed by machinists and tool-and-die professionals. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully in the chuck and tighten to the manufacturer-specified chuck torque for the machine in use. Inspect the cutting edges and coating for wear before each production run; replace the bit when the split point shows visible rounding or the diameter tolerance can no longer be held.