Hertel 16704405 Drill Bit Letter K 0.281 in Solid Carbide

Product Description

The HERTEL 16704405 is a screw machine length drill bit sized to Letter K (0.2810 inches decimal equivalent), built from solid carbide with a 135-degree split-point geometry. Solid carbide construction delivers the rigidity and hardness needed to drill through demanding workpiece materials including cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel. The 135-degree point self-centers on entry, reducing the need for a center punch on most setups. At 2-11/16 inches overall length, this stub-length format provides maximum rigidity and minimal deflection in short-reach applications. The bright uncoated finish is suited for use as-ground without additional coating buildup that could affect diameter tolerance.

This drill bit is designed for use in machining and metalworking environments where a short, rigid drill is required for accurate hole placement in hard or abrasive materials. The screw machine length format makes it a standard choice for CNC machining centers, turret lathes, and drill presses where tool overhang must be minimized. Its slow spiral flute design promotes chip control when drilling cast iron, stainless steel, and similar materials that produce broken or powdery chips rather than long stringy swarf.

Key Features

• Solid carbide construction for drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel
• 135-degree split-point geometry for self-centering entry and reduced thrust force
• Screw machine (stub) length at 2-11/16 inches OAL for maximum rigidity and minimal deflection
• Slow spiral flute design promotes chip evacuation in short-chip materials
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Bright uncoated finish maintains precise diameter tolerance straight from the grind

Compatibility

Designed as a direct-fit replacement screw machine length drill bit for machining setups requiring a Letter K diameter (0.2810 inches) in the 0.2500 to 0.3000 inch drill bit size range, with a straight-cylindrical shank compatible with standard drill chucks and ER-style collet holders.

Installation Notes

Installation and use of solid carbide drill bits should be performed by qualified machinists or toolroom personnel familiar with carbide tooling requirements. Secure the shank fully in a clean, undamaged chuck or collet before operation, and verify runout is within acceptable limits to prevent premature carbide fracture. Carbide is brittle compared to high-speed steel — avoid side loading, interrupted cuts without appropriate feeds and speeds, and contact with hardened fixtures. Always follow applicable machine guarding and PPE requirements for metalworking operations.