Cleveland C11643 Jobber Drill Bit Letter O Hss 0.316 in

Product Description

The CLEVELAND C11643 is a jobber length drill bit designed for precision hole-making in metalworking and fabrication applications. Sized at Letter O (0.3160 inches), it is manufactured from high speed steel with a bright, uncoated finish. The 135-degree split point reduces walking on contact and requires no center punch on most surfaces. With an overall length of 4.5 inches and a 3.1875-inch spiral flute, this bit delivers efficient chip evacuation and consistent cutting performance. It meets NAS 907 Type B standards and carries a heavy duty grade rating. Licensed HVAC technicians, machinists, pipefitters, and general trade professionals reach for this bit for everyday production drilling.

This drill bit is suited for drilling aluminum and similar non-ferrous materials in both shop and field environments. The straight-cylindrical shank fits standard three-jaw drill chucks without adapters. The regular spiral and tapered web configuration make it a reliable choice for repetitive jobber-length drilling tasks across light manufacturing, mechanical assembly, and service work. It is sold individually and is compatible with standard drill presses, cordless drills, and right-angle drill drivers that accept straight-shank bits.

Key Features

• Letter O size — 0.3160 inches diameter for precise, on-size holes
• 135-degree split point reduces thrust and eliminates walking without a center punch
• High speed steel construction handles the heat and wear of production drilling
• Bright, uncoated finish for general-purpose use across a range of materials
• Web-thinned, tapered web configuration reduces cutting resistance
• Meets NAS 907 Type B specification — heavy duty grade rating

Compatibility

Designed as a general-purpose jobber length drill bit for use in any standard drill chuck accepting a 0.3160-inch straight-cylindrical shank, consistent with Series 2222 tooling and NAS 907 Type B applications.

Installation Notes

Secure the shank fully in the chuck before drilling and verify chuck key is removed before starting the machine. Follow safe drilling practices per applicable OSHA and shop safety guidelines. When drilling aluminum or soft metals, use appropriate cutting fluid to extend tool life and improve finish quality. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.