Hertel 72294044 Chucking Reamer No. 4 Hss 6 Flute

Product Description

The HERTEL 72294044 is a straight-shank chucking reamer designed for precision hole finishing in metal and other materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers a reamed diameter of 0.2090 inches, corresponding to a No. 4 wire size. The 6-flute, right-hand spiral geometry improves chip evacuation and surface finish quality. At 3.75 inches overall length with a 1.25-inch flute length, this reamer is well suited for shallow-to-moderate depth finishing operations on the drill press, lathe, or CNC machining center.

This reamer is intended for machine tool use in metalworking applications requiring tight bore tolerances and smooth surface finish. The straight-cylindrical shank mates directly with drill chucks and collet holders, making it compatible with standard machine tool setups. It is a standard-size (not over/under), non-dowel-pin reamer, appropriate for general production and maintenance machining work performed by machinists and tool-and-die professionals.

Key Features

• 0.2090 inch reamed diameter — No. 4 wire size, within the 0.2000 to 0.2499 inch decimal range
• 6-flute right-hand spiral design for improved chip flow and consistent bore finish
• HSS construction provides good wear resistance and toughness across a range of workpiece materials
• Bright/uncoated finish — no coating buildup risk, suitable for regrinding
• Straight-cylindrical shank for use in standard drill chucks and collet holders
• Standard size reamer — not over/under, not a dowel pin reamer

Compatibility

Designed as an OEM-style machine reamer for use in standard drill press, lathe tailstock, or CNC machining center setups equipped with a drill chuck or straight-shank collet holder sized for the shank diameter.

Installation Notes

Chucking reamers are installed and removed by qualified machinists following standard lockout/tagout procedures before tool changes. Ensure the spindle is fully stopped and the machine is de-energized before securing or removing the reamer from the chuck or collet. Use a cutting fluid appropriate for the workpiece material to extend tool life and improve surface finish. Do not use a chucking reamer to remove excessive stock — bore to within a few thousandths of final diameter before reaming.