Hertel 72033491 Chucking Reamer 0.3490 in Hss 6 Flute

Product Description

The HERTEL 72033491 is a high-speed steel (HSS) chucking reamer designed to finish-size drilled or bored holes to a precise 0.3490-inch diameter. With a 7-inch overall length and six straight flutes, it delivers a smooth, accurate bore in a right-hand cutting direction. The straight-cylindrical shank seats securely in a drill chuck or collet chuck for reliable concentricity. Machinists and tool room operators use chucking reamers like this one when hole tolerances demand more accuracy than a drill alone can provide. The bright, uncoated HSS construction makes it well-suited for general-purpose reaming in steel, cast iron, aluminum, and similar materials.

This reamer is intended for use in manual drill presses, lathes, CNC machining centers, and turret mills where a floating or rigid holder drives the tool into a pre-drilled hole. The 1.75-inch flute length accommodates typical through-hole and shallow blind-hole applications in job shop and production environments. Its straight flute geometry is preferred when reaming brittle materials or when chip evacuation from the top of the hole is acceptable. Maintenance machinists, toolmakers, and general machine shop operators will find this reamer appropriate for standard precision hole-finishing work.

Key Features

• Precise 0.3490-inch finished diameter for tight-tolerance hole sizing
• Six straight flutes for smooth surface finish and even cutting load distribution
• Right-hand cutting direction compatible with standard spindle rotation
• HSS construction provides toughness across a broad range of workpiece materials
• Bright, uncoated finish — no coating buildup to affect dimensional accuracy
• Straight-cylindrical shank fits standard drill chucks and collet holders

Compatibility

Designed as a standard chucking reamer for use in any machine spindle or chuck that accepts a straight-cylindrical shank and accommodates the 0.3490-inch diameter class.

Installation Notes

Always power down and lock out the machine spindle before mounting or removing the reamer. A floating reamer holder is recommended to allow the tool to self-align with the existing hole and prevent bell-mouthing. The hole should be pre-drilled or bored to leave only a small amount of stock for the reamer to remove — typically 0.005 to 0.015 inches of stock for HSS reamers in this diameter range is common practice, though always follow your shop standards. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish.