Hertel 61699187 Screw Machine Drill Bit 0.221 in Hss

Product Description

The HERTEL 61699187 is a screw machine length drill bit designed for high-speed steel (HSS) cutting in general-purpose metalworking applications. With a 0.221-inch diameter (wire size No. 2) and a 118-degree standard point angle, this bit delivers consistent entry and chip evacuation across a wide range of materials. The spiral flute geometry and oxide finish support heat reduction during operation. At 2-7/16 inches overall length, the stub-length body offers added rigidity compared to jobber-length bits, making it well suited for drilling in tight clearances or production environments where chatter control matters.

This bit is used in screw machine operations, turret lathe setups, and general shop drilling where a short, rigid bit is preferred over jobber length. The straight-cylindrical shank fits standard drill chucks found on bench drill presses, CNC turrets, and hand-operated drill motors. It is suited for drilling steel, aluminum, brass, and similar materials in both production and maintenance-repair-operations (MRO) contexts. Machinists and toolroom technicians are the primary installers. The 3xD flute-to-diameter ratio supports chip clearance in moderate-depth holes without regrinding.

Key Features

• 0.221-inch diameter, wire size No. 2, within the 0.2000 to 0.2500-inch range
• 118-degree standard point angle for general-purpose entry into ferrous and non-ferrous stock
• High speed steel construction with oxide finish to reduce friction and heat buildup
• Screw machine (stub) length at 2-7/16 inches overall for improved rigidity and reduced deflection
• 1-5/16-inch flute length with regular spiral and 3xD flute ratio for reliable chip evacuation
• Straight-cylindrical shank for direct chuck mounting with no adapter required
• Right-hand cut with two flutes for standard clockwise-spindle drilling

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks accepting straight-cylindrical shanks in bench presses, drill motors, and CNC turret applications.

Installation Notes

Secure the shank fully in the drill chuck and verify runout before engaging the workpiece. Power down the spindle completely before changing or inspecting the bit. Follow applicable shop safety standards and wear eye protection during all drilling operations. Do not exceed the recommended feed rate for the material being drilled, as overfeeding a stub-length bit can cause tip breakage.