Cleveland C11648 Jobber Drill Bit Letter T 0.358 in Hss

Product Description

The CLEVELAND C11648 is a jobber-length drill bit sized at Letter T (0.3580 inches) with a 135-degree split-point tip and a bright, uncoated high-speed steel construction. Designed for right-hand cutting with a regular spiral flute and web-thinned geometry, it delivers consistent hole entry and reduced thrust in a wide range of drilling applications. The straight-cylindrical shank measures 0.3580 inches in diameter and 1.375 inches in length. With an overall length of 4.875 inches and a flute length of 1.750 inches, the C11648 fits standard drill chucks without modification. This is a heavy-duty grade bit built to NAS 907 Type B standards and is suited for installation by machinists, maintenance technicians, and trade professionals working in metal fabrication and mechanical assembly.

The C11648 is primarily rated for drilling aluminum and is well suited to production and maintenance drilling where a Letter T hole size is required. The 135-degree split point self-centers on the workpiece surface and minimizes the need for a center punch on flat stock. The two-flute spiral design clears chips efficiently during through-hole drilling. This bit is a single-piece, individual-quantity item conforming to NAS 907 Type B and UNSPSC code 23241634, making it appropriate for procurement in aerospace-adjacent, commercial, and industrial maintenance environments.

Key Features

• Letter T diameter: 0.3580 inches with a tolerance of -0.0010 to 0.0000 inches
• 135-degree split-point tip for self-centering and reduced thrust
• Web-thinned, tapered web construction reduces drilling resistance
• High-speed steel, bright/uncoated finish for general-purpose cutting
• Right-hand cut, regular spiral, two-flute design for efficient chip evacuation
• Meets NAS 907 Type B standards; heavy-duty grade

Compatibility

Rated for use on aluminum as the primary workpiece material. Fits standard drill chucks accepting a 0.3580-inch straight-cylindrical shank. Conforms to NAS 907 Type B specification for use in applications requiring that standard.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade technicians familiar with drill press, hand drill, or CNC drilling equipment. Secure the workpiece firmly before drilling and set spindle speed appropriate to the material and bit diameter. Inspect the cutting edges and web for wear or damage before each use. Do not exceed the rated capacity of the drill chuck or spindle for this shank diameter.