Chicago-latrobe 48218 Screw Machine Drill Bit 9/32 in Hss

Product Description

The CHICAGO-LATROBE 48218 is a screw machine length drill bit designed for heavy-duty drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it features a 135-degree split point that reduces walking and cutting resistance at entry. The stub-length body keeps the bit rigid and minimizes deflection in production and repair environments. At 0.2812 inches (9/32 inch) in diameter with a parallel web and web-thinned geometry, this bit is suited for machinists, maintenance technicians, and fabricators who need consistent hole quality in ferrous materials.

This bit fits standard screw machine and drill press setups used in metal fabrication shops, maintenance facilities, and production lines. The straight cylindrical shank seats in standard drill chucks without adapters. Its overall length of 2-11/16 inches and flute length of 1-1/2 inches make it ideal for through-hole and blind-hole drilling in tight clearance applications where a jobber-length bit would flex or wander. Typical users include machine operators and field maintenance techs drilling structural steel, castings, and plate stock.

Key Features

• 135-degree split point reduces drill walking and lowers thrust force at entry
• Web-thinned, parallel web construction for improved chip evacuation in ferrous materials
• Screw machine (stub) length body provides maximum rigidity and reduces deflection
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Right-hand spiral flute with regular helix angle suits a broad range of ferrous workpieces
• Diameter tolerance held to +0.0000 to -0.0010 inches for consistent, close-tolerance holes

Compatibility

Designed for drilling cast iron and steel workpieces. Compatible with standard drill chucks accepting straight cylindrical shanks. Meets NAS 907 specification designation NAS and conforms to ISO standards. Suitable for use in drill presses, screw machines, and hand drills within the 0.2500 to 0.3000 inch diameter range category.

Installation Notes

Secure the straight cylindrical shank firmly in a keyed or keyless chuck before operation. Use cutting fluid or coolant when drilling steel at higher speeds to prevent overheating and premature edge wear. Inspect the split point for chipping before each use, as a damaged point will affect hole quality and increase thrust load. Follow applicable shop safety standards and machine guarding requirements during all drilling operations.