Chicago-latrobe 49426 Screw Machine Drill Bit 0.0465 in

Product Description

The CHICAGO-LATROBE 49426 is a screw machine length drill bit designed for high-production 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 on entry. The stub-length body keeps deflection low in short-reach applications. With a wire gauge diameter of #56 (0.0465 inches) and a diameter tolerance of +0.0000 to -0.0005 inches, the bit holds tight size control for precision hole work. Right-hand spiral flutes evacuate chips efficiently. Licensed trades and machining professionals install this bit in screw machine setups, drill presses, and handheld power tools.

The 49426 is suited for drilling operations in residential and commercial trade environments where short, rigid tooling is preferred over jobber-length bits. Its 1-3/8 inch overall length and 1/2 inch flute length make it well matched to close-clearance fixtures and screw machine turrets. Primary workpiece materials are cast iron and steel, making it a practical choice for HVAC, plumbing, and mechanical contractors drilling structural steel, pipe hangers, and equipment enclosures. The parallel web configuration and web-thinned geometry support consistent entry geometry across repeated drilling cycles.

Key Features

• 135-degree split point reduces drill walk and lowers required thrust on entry
• High speed steel construction with coated finish for improved wear resistance on steel and cast iron
• Screw machine (stub) length body minimizes deflection in short-reach and fixture-guided applications
• Web-thinned, parallel web geometry supports clean, consistent hole entry
• Diameter tolerance of +0.0000 to -0.0005 inches for tight size control
• Meets NAS 907 and ISO standards; Series 159 heavy-duty grade

Compatibility

Designed as an OEM-style replacement and standard-production drill bit for screw machine setups and power drill applications targeting cast iron and steel workpieces in the 0.0000 to 0.1000 inch diameter range.

Installation Notes

This bit is installed by machinists, tool-and-die technicians, and trade professionals using screw machines, drill presses, or handheld power tools. Secure the straight-cylindrical shank fully in the chuck before operation to prevent slippage. Match spindle speed to the workpiece material and bit diameter per standard feeds-and-speeds references for high speed steel tooling. Inspect the cutting edges and web for wear or chipping before each use; a damaged split point affects hole size and finish.