Hertel 74148867 Screw Machine Drill Bit 13/64 in Carbide

Product Description

The HERTEL 74148867 is a screw machine length drill bit designed for high-performance drilling in tough materials. Built from solid carbide with a bright/uncoated finish, this bit delivers rigid, precise cutting in compact setups where a jobber-length bit would flex or chatter. The 135-degree split point reduces walking and breakthrough burring, and the slow spiral flute geometry controls chip evacuation when working in dense, work-hardening, or abrasive stock. At 2.25 inches overall length, it fits short-reach drilling fixtures and CNC turrets common in production environments. The 13/64-inch diameter (0.2031 inches decimal) holds a tight tolerance of plus 0.0000 to minus 0.0005 inches, making it suitable for close-tolerance hole applications.

This bit is engineered for drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel - materials that demand carbide over high-speed steel due to hardness and heat generation. The straight cylindrical shank seats cleanly in standard drill chucks and collet holders without slippage. Typical use cases include CNC machining centers, drill presses, and manual turret lathes running production runs in aerospace, toolroom, and general metalworking environments. It is sold individually and intended for professional machinists and toolroom technicians.

Key Features

• Solid carbide construction (Material Grade C2) for hardened and abrasive workpiece materials
• 135-degree split point reduces drill walk and minimizes breakthrough burring
• Slow spiral flute geometry aids chip control in stainless steel, titanium alloy, and nickel alloy
• Web-thinned, parallel web configuration reduces cutting thrust at entry
• Tight diameter tolerance of plus 0.0000 to minus 0.0005 inches for close-tolerance holes
• Bright/uncoated finish - no coating buildup, compatible with coolant-assisted setups

Compatibility

Designed for use in standard straight-shank drill chucks and collet holders on CNC machining centers, drill presses, and turret lathes. Primary workpiece materials include cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. Part of the HSSC135-SS series.

Installation Notes

Solid carbide drill bits are brittle and should be secured firmly in a collet or chuck to prevent runout before spindle engagement. Ensure the machine spindle is fully stopped and locked before changing or inspecting tooling. Do not use in hand-held portable drills - carbide bits require rigid fixturing to prevent chipping or fracture. Verify cutting direction is set to right-hand rotation before use.