Hertel 16705048 Screw Machine Drill Bit No 39 Solid Carbide

Product Description

The HERTEL 16705048 is a screw machine length drill bit designed for high-precision drilling in demanding materials. Built from solid carbide, this bit handles cast iron, stainless steel, nickel alloys, titanium alloys, and tool steel without breaking down under heat or abrasion. The 135-degree split-point tip reduces walking and requires no center punch on most surfaces. At 1.8125 inches overall length with a 0.1875-inch flute length, this is a stubby-format bit engineered for rigidity and accuracy in short-travel applications. It cuts right-hand with a slow spiral and a straight cylindrical shank for direct chuck mounting. Installed by machinists and toolroom technicians on drill presses, CNC machines, and hand-held production drills.

This bit is sized to wire gauge No. 39, which corresponds to a decimal diameter of 0.0995 inches. It is suited for tapping pilot holes, through-holes, and precision bore work in ferrous and exotic alloy workpieces. The screw machine length format keeps the bit stiff and limits deflection, making it the right choice when hole location tolerance is tight or the material work-hardens quickly. No coolant-through capability; external flood or mist cooling is recommended when drilling stainless steel, titanium alloys, or nickel alloys at production feed rates.

Key Features

• Solid carbide construction resists heat and abrasion in hard and exotic alloy materials
• 135-degree split point reduces thrust load and eliminates the need for center-punching on most surfaces
• Screw machine length format maximizes rigidity and minimizes deflection in short-travel drilling
• Slow spiral geometry promotes chip clearance in gummy or stringy materials
• Bright/uncoated finish maintains tight diameter tolerance out of the box
• Straight cylindrical shank fits standard drill chucks and collets without adapters

Compatibility

Designed as a replacement-style screw machine length drill bit for use in standard straight-shank drill chucks and collet systems accepting a 0.0995-inch diameter tool.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or toolroom technicians familiar with carbide tooling. Carbide is brittle — avoid side loads, interrupted cuts without proper setup, and dropping the bit on hard surfaces. Secure the shank fully in the chuck or collet before operation and verify runout before drilling into hardened or exotic alloy stock. External coolant is strongly recommended for stainless steel, titanium, and nickel alloy applications to prevent work hardening and premature edge failure.