Cle-line C23472 Screw Machine Drill Bit Letter E 0.25 in

Product Description

The CLE-LINE C23472 is a screw machine length drill bit sized at Letter E (0.2500 inches) and built from high-speed steel with a coated finish for extended wear resistance. It features a 135-degree split point with web thinning, which reduces walking on entry and lowers the thrust needed to start a hole. The overall length is 2.5 inches, making it suited to short-reach drilling applications where standard jobber bits would be prone to deflection. Two spiral flutes with a regular helix handle chip evacuation effectively. This bit conforms to ASME B94.11M and is rated for heavy-duty, high-performance use. It is installed by machinists, tool-and-die workers, and maintenance technicians.

This bit is designed for drilling into cast iron and steel, the primary workpiece materials for which it is rated. Screw machine length geometry gives the bit added rigidity over jobber-length alternatives, making it a preferred choice on drill presses, CNC machining centers, turret lathes, and screw machines where short, stiff tooling reduces runout and improves hole accuracy. The straight-cylindrical shank with a 0.2500-inch diameter seats directly into standard chucks and collets without adapters.

Key Features

• Letter E sizing (0.2500 inches decimal) with a diameter tolerance of +0.0000 to -0.0007 inches for close-tolerance work
• 135-degree split point with web thinning reduces walking and entry thrust on hard materials
• High-speed steel construction with coated finish for improved surface hardness and wear life
• Screw machine length (2.5 inches OAL) provides rigidity and reduces deflection in short-reach setups
• Two spiral flutes with regular helix promote efficient chip removal in cast iron and steel
• Conforms to ASME B94.11M standard for drill geometry and dimensional accuracy

Compatibility

Designed as an OEM-style screw machine length drill bit rated for cast iron and steel workpieces, compatible with any standard chuck or collet accepting a 0.2500-inch straight-cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank fully in a chuck or collet and verify runout before cutting. Always power down and lock out the machine before changing tooling. Follow applicable shop safety standards and the machine manufacturer guidelines for feed rate and spindle speed when drilling into ferrous materials.