Hertel 72294051 Chucking Reamer No.5 Hss 6 Flute

Product Description

The HERTEL 72294051 is a No. 5 wire-size chucking reamer designed to bring bored or drilled holes to a precise finished diameter of 0.2055 inches. Constructed from high-speed steel (HSS), this reamer features six spiral flutes with a right-hand spiral direction that evacuate chips cleanly and reduce chatter during the finishing pass. The straight-cylindrical shank seats securely in standard drill chucks, collet holders, or floating reamer holders. With an overall length of 3.75 inches and a flute length of 1.25 inches, this tool is well suited for short-reach through-holes and blind holes in ferrous and non-ferrous materials. It is a standard production tool used by machinists and toolroom technicians.

This chucking reamer is intended for machine use in drill presses, lathes, CNC machining centers, and manual milling machines where a controlled, repeatable final hole size in the 0.2000 to 0.2499 inch diameter range is required. Typical applications include sizing holes for dowel pins, bushings, and precision-fit fasteners in metalworking and fabrication environments. It is sold and packaged as a single unit with a minimum order quantity of one.

Key Features

• No. 5 wire-size diameter of 0.2055 inches for precise hole finishing
• Six spiral, right-hand flutes for smooth chip evacuation and reduced chatter
• HSS construction provides good wear resistance across a range of workpiece materials
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Compact 3.75-inch overall length suited to short-reach applications
• 1.25-inch flute length appropriate for through-holes and shallow blind holes

Compatibility

Designed as a standard chucking reamer for use in any machine tool spindle that accepts a straight-cylindrical shank in this diameter range, including drill presses, lathes, and machining centers.

Installation Notes

Chucking reamers should be installed by a qualified machinist and run at reduced RPM compared to drilling — typically one-third to one-half of the drilling speed for the same material. Ensure the workpiece is securely fixtured and the pre-drilled hole is within the recommended undersize allowance before reaming. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Never reverse a reamer while it is engaged in a hole.