Hertel 72308059 Chucking Reamer 0.2055 in Cobalt Steel

Product Description

The HERTEL 72308059 is a straight-flute chucking reamer designed to finish-ream drilled holes to a precise 0.2055-inch diameter, corresponding to wire size number 5. Manufactured from cobalt steel with a bright, uncoated finish, it provides good hardness and heat resistance for use in ferrous and non-ferrous materials. The straight-cylindrical shank seats securely in standard drill chucks or collet holders. With six flutes and right-hand cutting action, it delivers a smooth, consistent bore finish. Overall length is 5 inches, and flute length is 1.25 inches. Machinists and tool-and-die professionals use this reamer for close-tolerance hole sizing in production and maintenance applications.

This reamer is suited for manual and CNC drilling operations where a reamed hole in the 0.2000 to 0.2499-inch diameter range is required. Typical applications include precision fit of dowel holes, bearing bores, and bushing seats in light-to-medium machining environments. The cobalt steel construction makes it a practical choice when working harder workpiece materials where high-speed steel tooling shows accelerated wear. It is sold and packaged as a single unit.

Key Features

• Wire gauge number 5 diameter at 0.2055 inches for precise hole sizing
• Cobalt steel construction for improved heat and wear resistance over standard high-speed steel
• Six straight flutes with right-hand cutting direction for smooth bore finish
• Bright, uncoated finish suitable for a broad range of workpiece materials
• Straight-cylindrical shank for direct chuck or collet mounting without adapter
• Compact 5-inch overall length accommodates tight machine clearances

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and CNC machining centers accepting a straight-cylindrical shank tool in the 0.2000 to 0.2499-inch diameter range.

Installation Notes

This reamer is installed and operated by machinists following standard machine-shop practice. Ensure the machine spindle is fully stopped and power is off before seating or removing the tool from the chuck or collet. Use the correct cutting fluid or lubricant for the workpiece material to extend tool life and achieve the target surface finish. Do not use a reamer to remove excessive stock; pre-drill or bore the hole to within a few thousandths of final size before reaming.