Hertel 66691346 Screw Machine Drill Bit 17/64 Cobalt

Product Description

The HERTEL 66691346 is a screw machine length drill bit designed for high-production drilling in metal fabrication, maintenance, and industrial trade applications. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, this bit delivers extended tool life when cutting through tough ferrous metals, stainless steel, and hard alloys. The 135-degree split point reduces walking and allows drilling without a center punch in many applications. At 2-5/8 inches overall length with a 1-7/16 inch flute length, the stub-length body provides added rigidity compared to jobber-length bits, reducing deflection in high-feed operations.

This drill bit is suited for machine shop work, field maintenance, and production drilling where short overall length and rigidity are priorities. The straight cylindrical shank at 0.2656 inches diameter fits standard drill chucks and quick-change holders. It is well suited for use in drill presses, CNC machining centers, and hand-held electric drills where the 17/64 inch diameter is required. Trades such as pipefitters, ironworkers, millwrights, and maintenance machinists commonly use screw machine length bits when working in tight clearances or requiring chatter-free holes.

Key Features

• Cobalt high-speed steel construction for heat resistance and durability in hard materials
• TiN coating reduces friction and extends cutting edge life
• 135-degree split point minimizes walking and reduces thrust force required
• Stub screw machine length (2-5/8 inches OAL) adds rigidity over standard jobber bits
• Right-hand spiral flute with web-thinned, parallel web configuration for efficient chip evacuation
• Heavy duty grade rated for demanding production environments

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for any standard drill chuck or quick-change holder accepting a 0.2656-inch straight cylindrical shank.

Installation Notes

Installation requires securing the shank fully in the drill chuck before operation. Always power down and de-energize the machine or tool before changing bits. Use appropriate cutting fluid or coolant when drilling ferrous metals to preserve coating and edge life, noting this bit does not support coolant-through delivery. Consult applicable OSHA and ANSI machining safety standards for proper workholding and eye protection requirements.