Hertel 79889952 Chucking Reamer 0.275 in Solid Carbide

Product Description

The HERTEL 79889952 is a solid carbide chucking reamer designed for precision hole finishing in machine tool applications. It features a straight flute geometry with a right-hand cutting direction and a straight cylindrical shank for secure chuck mounting. The reamer measures 0.275 inches in diameter with an overall length of 3.25 inches and a flute length of 1.125 inches. Diameter tolerance is held to 0.0000 to 0.0003 inches, making it appropriate for close-tolerance bore finishing where surface finish and dimensional accuracy are critical. With six flutes and a bright uncoated solid carbide construction, this reamer delivers consistent results in production and repair environments.

This chucking reamer is suited for use in CNC machining centers, drill presses, and manual lathes where a pre-drilled hole requires finishing to a precise diameter. It is a standard choice for machinists and tool-and-die technicians working in job shops, maintenance departments, and production facilities. The 0.275-inch diameter falls within the 0.2500 to 0.2999 inch reamer diameter range, making it a go-to option for holes in that size class across a wide range of workpiece materials compatible with uncoated solid carbide tooling.

Key Features

• Solid carbide construction for rigidity and wear resistance in precision boring applications
• Six straight flutes with right-hand cutting direction for smooth, consistent stock removal
• Diameter tolerance of 0.0000 to 0.0003 inches for tight-tolerance hole finishing
• Bright uncoated finish suitable for use with cutting fluids across compatible materials
• Straight cylindrical shank for direct mounting in chucks or collets
• Compact 3.25-inch overall length ideal for close-clearance setups

Compatibility

Designed as an OEM-style chucking reamer for use in standard straight-shank chuck holders and collet systems accepting a 0.275-inch diameter straight cylindrical shank.

Installation Notes

Installation should be performed by a qualified machinist following standard tool-holding procedures. Ensure the machine spindle is fully stopped and locked out before inserting or removing the reamer from the chuck or collet. Secure the shank with adequate clamping force to prevent slippage during cutting, and verify runout with a dial indicator before commencing the reaming pass. Use an appropriate cutting fluid compatible with solid carbide tooling to extend tool life and improve surface finish.