Hertel 2291409 Chucking Reamer Size 40 Hss 4 Flute

Product Description

The HERTEL 2291409 is a straight-flute chucking reamer designed to finish-ream holes to a precise wire gauge No. 40 diameter of 0.0980 inches. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers clean, accurate bores in a wide range of ferrous and non-ferrous workpiece materials. The 4-flute, right-hand cutting geometry produces a smooth bore surface and consistent chip evacuation during machine reaming operations. At 3.5 inches overall length with a 0.875-inch flute length and a straight-cylindrical shank, it seats reliably in standard drill chucks, collets, and floating holders on mills, drill presses, and lathes.

This reamer is suited for precision hole-finishing in machine shop, toolroom, and production environments. It is used wherever a close-tolerance through-hole or blind hole must be brought to a finished diameter in the 0.0500 to 0.0999 inch decimal range. Typical applications include fixture and jig work, small-diameter dowel hole preparation, and precision component assembly where a reamed finish is required. It is not configured as a dowel pin reamer or an over/under-size reamer, making it a standard on-size finishing tool.

Key Features

• Wire gauge No. 40 diameter: 0.0980 inches finished bore
• High-speed steel (HSS) construction for durability across common workpiece materials
• 4-flute straight geometry with right-hand cutting direction for consistent material removal
• Bright/uncoated finish — no coating buildup to affect tolerance at small diameters
• Straight-cylindrical shank fits standard chucks, collets, and floating holders
• Compact 3.5-inch OAL suits close-clearance setups and short-reach applications

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks, collets, and floating reamer holders on CNC machining centers, drill presses, lathes, and manual mills accepting a straight-cylindrical shank in the applicable diameter range.

Installation Notes

Chucking reamers are installed by machinists and toolroom technicians. Secure the straight-cylindrical shank fully and concentrically in the holder before use to prevent runout. Always power down and lock out the machine spindle before changing tooling. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality.