Cleveland C11649 Letter U Jobber Drill Bit Hss 135

Product Description

The CLEVELAND C11649 is a jobber-length drill bit sized to Letter U (0.3680 inches), designed for general-purpose drilling in metal fabrication and maintenance applications. Built from high-speed steel with a bright uncoated finish, this bit features a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. The web-thinned, tapered web construction further reduces cutting resistance. With an overall length of 5 inches and a flute length of 3.625 inches, it delivers the reach and chip-clearing capacity typical jobber-length work demands. A licensed HVAC tech, pipefitter, or maintenance mechanic reaching for a Letter U bit to tap a 3/8-16 or similar hole will find this a reliable, heavy-duty option.

The C11649 is suited for drilling aluminum as the primary workpiece material, though its heavy-duty HSS construction handles a broad range of general metalworking tasks. The straight-cylindrical shank seats directly in standard drill chucks without adapters, making it compatible with benchtop drill presses, hand drills, and magnetic drills used in field and shop environments. The right-hand spiral flute promotes efficient chip evacuation during through-hole and blind-hole drilling operations. This bit carries NAS 907 Type B compliance, a specification common in aerospace and industrial maintenance contexts.

Key Features

• Letter U size: 0.3680 inches diameter with a tight tolerance of -0.0010 to 0.0000 inches
• 135-degree split point reduces walking and lowers required feed pressure
• Web-thinned tapered web for reduced cutting resistance and easier penetration
• High-speed steel construction with bright uncoated finish for general metalworking use
• NAS 907 Type B compliant — meets aerospace and industrial maintenance specifications
• Straight-cylindrical shank fits standard drill chucks with no adapter required

Compatibility

Designed as a standard jobber-length drill bit for use in any drill press, cordless or corded hand drill, or magnetic base drill equipped with a chuck that accepts a 0.3680-inch straight shank. Primary workpiece material is aluminum; also applicable to general metalworking per NAS 907 Type B service requirements.

Installation Notes

Install the bit securely in a properly sized drill chuck and verify the shank is fully seated before operation. Secure the workpiece with clamps or a vise — never hand-hold small workpieces during drilling. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and maintain dimensional accuracy. Follow applicable shop-safety standards and PPE requirements for rotating tooling.