Chicago-latrobe 45638 Drill Bit Set 26 Pc Letter A-z Hss

Product Description

The CHICAGO-LATROBE 45638 is a 26-piece jobber length drill bit set covering the full letter series from A through Z. Built from high speed steel with an oxide finish, each bit features a 135-degree split-point tip that reduces walking and allows drilling to start without a center punch. The straight shank design works with standard three-jaw drill chucks. This set meets NAS 907 specification and is sized on the inch measurement system, making it a reliable bench set for metal fabrication shops, maintenance departments, and trade contractors who need a complete letter-size range on hand.

The 45638 is engineered for metalworking and general multipurpose drilling applications. The full A-through-Z letter range covers intermediate hole sizes that fall between standard fractional increments, making this set especially useful when drilling to tap-drill sizes for machine screw threads. The 26 bits store in an included metal or plastic case, keeping each size indexed and accessible in a shop or service van environment. This is a high-performance series intended for production and maintenance use where consistent hole quality in steel, aluminum, and similar materials is required.

Key Features

• Full letter series A through Z — 26 jobber length drills in one set
• 135-degree split-point geometry reduces tip walking and cutting thrust
• High speed steel construction with oxide finish for wear resistance
• Straight shank fits standard drill chucks without adapters
• Meets NAS 907 specification for consistent dimensional accuracy
• Right-hand cutting direction; no coolant-through requirement
• Includes metal or plastic indexed storage case

Compatibility

Designed for use in standard three-jaw keyed or keyless drill chucks on benchtop drill presses, hand drills, and milling machines. Compatible with metalworking applications in steel, aluminum, cast iron, and multipurpose materials as noted in the Series 150ASP product designation.

Installation Notes

Installation is performed by machinists, maintenance technicians, or trade professionals using standard drill press or handheld drilling equipment. Ensure the chuck is fully tightened and the workpiece is securely clamped before drilling. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and maintain hole quality. Inspect each bit for signs of wear or damage before use and replace any bit that shows chipping or excessive dulling at the cutting edge.