Hertel 2290161 Chucking Reamer Letter E 0.250 Inch Hss

Product Description

The HERTEL 2290161 is a straight-flute chucking reamer designed to finish-ream holes to a precise Letter E (0.2500 inch) diameter. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers clean, accurate bores in ferrous and non-ferrous materials. The straight-cylindrical shank seats securely in standard drill chucks or collet holders, and the right-hand cutting direction makes it compatible with conventional machine setups. With a 6-inch overall length and a 1.5-inch flute length, this reamer suits general-purpose machine shop and production reaming operations.

This reamer is intended for use in machining centers, lathes, drill presses, and manual milling machines where a controlled, finish-quality bore is required. It is well suited for toolmakers, machinists, and maintenance technicians working in job shops or production environments. The 0.2500-inch cutting diameter corresponds to Letter E sizing, covering the 0.2500 to 0.2999-inch decimal inch range for standard hole finishing tasks. No special adapter is required when used with a straight-bore chuck or ER collet system.

Key Features

• Letter E (0.2500 inch) cutting diameter for precise hole finishing
• High-speed steel (HSS) construction for durability across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose reaming applications
• Straight flute geometry provides smooth cutting action and easy chip clearance
• Straight-cylindrical shank fits standard drill chucks and collet holders without adapters
• Right-hand cutting direction for use with conventional spindle rotation

Compatibility

Designed as an OEM-style chucking reamer compatible with standard drill chucks, collet systems, and machine tool holders accepting a straight-cylindrical shank at 0.2500-inch diameter.

Installation Notes

Chucking reamers are installed by machinists or toolmakers using standard machine tool setup procedures. Power down and lock out the machine before mounting or removing the reamer from the chuck or collet. Ensure the shank is fully seated and the holder is properly torqued per the machine tool manufacturer's guidelines before operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality.