Cleveland C11654 Drill Bit Letter Z 0.4130 in Hss

Product Description

The CLEVELAND C11654 is a jobber-length drill bit sized to letter Z (0.4130 inches) with a 135-degree split-point tip and a two-flute right-hand spiral cut. Manufactured from high-speed steel with a bright uncoated finish, this bit falls under the heavy-duty grade designation and meets NAS 907 Type B standards. The split point reduces walking at startup and lowers thrust requirements compared to a conventional 118-degree point. With an overall length of 5.25 inches and a straight-cylindrical shank diameter of 0.4130 inches, it is compatible with standard drill chucks and CNC toolholders that accept that shank size.

This drill bit is suited for production and maintenance drilling operations in aluminum and similar non-ferrous or softer ferrous materials. The Series 2222 design features a regular spiral with web thinning and a tapered web configuration, which improves chip evacuation during through-hole drilling. It is a common choice for machinists, maintenance technicians, and fabricators working in light manufacturing, aerospace component shops, and general machine shops where letter-size tooling is specified on engineering drawings or process sheets.

Key Features

• Letter Z size: 0.4130 inches diameter with a tolerance of -0.0010 to 0.0000 inches
• 135-degree split-point tip reduces drill walking and lowers feed pressure
• High-speed steel construction with bright uncoated finish for general-purpose use
• Web-thinned, tapered web for improved chip flow and reduced thrust
• Right-hand cut, regular spiral, two-flute geometry
• Meets NAS 907 Type B specification — heavy-duty grade

Compatibility

Designed as a jobber-length replacement or production drill bit for applications requiring a letter Z (0.4130-inch) diameter hole, primarily in aluminum and similar workpiece materials, as noted in the NAS 907 Type B specification.

Installation Notes

Installation of this bit requires a drill chuck or collet rated for a 0.4130-inch straight-cylindrical shank. Secure the shank fully within the chuck jaws before operating. Ensure the spindle is at a complete stop before changing tooling. Follow shop safety protocols and applicable OSHA machining guidelines when operating drilling equipment.