Hertel 72008550 Chucking Reamer 0.0855in Hss 4 Flute

Product Description

The HERTEL 72008550 is a straight-flute chucking reamer designed to finish-ream drilled holes to a precise 0.0855-inch diameter. Machined from high-speed steel (HSS) with a bright, uncoated finish, it delivers accurate sizing in small-bore applications where dimensional control is critical. The straight-cylindrical shank seats securely in standard drill chucks or collets. With four flutes and right-hand cutting direction, the tool produces a clean, consistent surface finish in a single pass. At 3 inches overall length and a 3/4-inch flute length, it is well suited for shallow-to-moderate depth holes in ferrous and non-ferrous materials.

This chucking reamer is intended for use in machine shop, toolroom, and production environments where tight hole tolerances are required after drilling. Typical applications include reaming pilot holes, clearance holes, and pin-fit bores in small workpieces. It is run in CNC machining centers, knee mills, drill presses, and manual lathes with the part held stationary. Licensed machinists, tool-and-die makers, and precision fabricators are the primary users of this style of reamer.

Key Features

• 0.0855-inch finished bore diameter for tight-tolerance small-hole applications
• High-speed steel (HSS) construction provides good wear resistance across a range of workpiece materials
• Bright uncoated finish — no coating to add uncertainty to the finished hole diameter
• Four straight flutes with right-hand cutting direction for smooth, consistent stock removal
• Straight-cylindrical shank for direct chuck or collet mounting without adapter
• 3-inch overall length with 3/4-inch flute length suits shallow and moderate-depth bore applications

Compatibility

Designed as a standard chucking reamer for use in any machine tool spindle accepting a straight-cylindrical shank of the appropriate diameter, including drill presses, milling machines, and CNC machining centers.

Installation Notes

Chucking reamers are installed by machinists in the spindle of a machine tool — always power down and lock out the machine before changing tooling. Secure the shank fully in the chuck or collet to minimize runout, which directly affects finished hole quality. Use the appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Do not run a reamer in reverse, as this will damage the cutting edges.