Hertel 61699021 Screw Machine Drill Bit No. 10 Hss

Product Description

The HERTEL 61699021 is a screw machine length drill bit designed for general-purpose drilling in metal, plastic, and similar materials. Built from high-speed steel with an oxide coating, this bit delivers reliable performance in production and job-site environments where stub-length rigidity is preferred over jobber-length flex. It cuts a 0.1935-inch diameter hole, corresponding to No. 10 wire size, with a standard 118-degree point angle that suits most common drilling applications. The right-hand cut and two-flute spiral design promote efficient chip evacuation and smooth entry. At 2.25 inches overall length, the compact geometry improves stability in drill presses, CNC machines, and hand-held equipment.

This bit is suited for machinists, tool and die shops, fabrication facilities, and maintenance technicians who require consistent, repeatable hole quality in light- to medium-duty applications. Screw machine length bits are commonly selected when working in tight spaces or when minimizing deflection is critical. The straight-cylindrical shank fits standard three-jaw drill chucks without adapters. This is a single-bit package sold in minimum quantities of 12 units per order.

Key Features

• No. 10 wire size — 0.1935-inch cutting diameter for precise hole sizing
• 118-degree standard point angle for general-purpose entry into most workpiece materials
• High-speed steel construction with oxide coating for wear resistance and reduced friction
• Screw machine (stub) length at 2.25 inches OAL reduces deflection compared to jobber-length bits
• 1.1875-inch flute length with regular spiral and 3xD flute-to-diameter ratio for efficient chip clearing
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose replacement or stock drill bit for use in standard three-jaw chucks accepting straight-cylindrical shanks; compatible with drill presses, CNC drilling centers, and hand-held electric drills configured for screw machine length tooling.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and the chuck key removed before loading the bit. Secure the shank fully into the chuck jaws and tighten evenly to prevent slippage under load. Machinists and fabricators should verify spindle speed against recommended surface footage for the target material before beginning a drilling cycle. Coolant through is not supported on this bit; apply cutting fluid externally when drilling ferrous metals to extend tool life.