Hertel 16704769 Screw Machine Drill Bit No. 34 Solid Carbide

Product Description

The HERTEL 16704769 is a screw machine length drill bit ground from solid carbide and configured for short-hole drilling in hard and difficult-to-machine materials. It carries a No. 34 wire gauge size, which corresponds to a decimal diameter of 0.111 inches. The 135-degree split-point geometry reduces walking on entry and lowers the thrust force required to penetrate hard substrates. At 1.875 inches overall length, the stub-length format provides increased rigidity compared to jobber-length bits, making it well-suited for CNC machining centers, drill presses, and screw machine operations where deflection must be minimized. The bright, uncoated finish makes edge condition easy to inspect after resharpening.

This drill bit is intended for production and maintenance machining environments. It is used when drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel — materials that demand carbide rather than high-speed steel. The two-flute, slow-spiral design aids chip evacuation in these short, tough-chip materials. Machinists, tool and die makers, and maintenance technicians working in industrial or production settings are the primary users. The straight cylindrical shank seats directly in standard drill chucks and collet holders without adapters.

Key Features

• Solid carbide construction provides the hardness and heat resistance needed for ferrous and exotic alloy drilling
• 135-degree split point reduces thrust and eliminates center-punching on most materials
• Slow-spiral flute geometry promotes chip breaking and clearance in short-chip materials
• Stub screw machine length of 1.875 inches overall maximizes rigidity and reduces deflection
• Bright uncoated finish allows straightforward visual inspection of cutting edges
• Straight cylindrical shank fits standard drill chucks and collet systems without modification

Compatibility

Designed as an OEM-style replacement screw machine drill bit suitable for standard drill chucks and collet holders accepting a straight cylindrical shank within the 0.100 to 0.150 inch decimal inch drill bit size range.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling. Ensure the drill chuck or collet is clean and properly torqued before operation, as solid carbide is brittle and sensitive to runout. Power down and lock out the machine spindle before changing or inspecting tooling per applicable shop safety procedures. Coolant-through capability is not available on this bit, so adequate flood or mist coolant should be directed at the cutting zone when drilling stainless steel, titanium, or nickel alloys to prevent heat buildup and premature edge failure.