Hertel 72033939 Chucking Reamer 0.3930 in 6 Flute Hss

Product Description

The HERTEL 72033939 is a straight-flute chucking reamer designed for precision hole finishing in metal machining applications. Built from high-speed steel (HSS) with a bright, uncoated finish, this reamer delivers consistent dimensional accuracy for bored or drilled holes. It measures 0.3930 inches in diameter with an overall length of 7 inches and a 1-3/4-inch flute length. The six-flute geometry and right-hand cutting direction provide smooth, efficient material removal with reduced chatter. The straight-cylindrical shank seats securely in standard drill chucks and collet holders, making tool changes fast and repeatable on the shop floor.

This chucking reamer is suited for use in manual drill presses, CNC machining centers, and engine lathes where tight hole tolerances are required. It is appropriate for general-purpose reaming in ferrous and non-ferrous metals including steel, cast iron, and aluminum. The 0.3930-inch diameter falls within the 0.3500 to 0.3999 inch reamer diameter range, making it a standard selection for finish-reaming holes in that size class. Machinists and toolroom technicians working in production or maintenance environments will find this reamer compatible with common machine setups without special adapters.

Key Features

• 0.3930-inch cutting diameter for precise hole finishing in the 0.35 to 0.3999 inch range
• High-speed steel (HSS) construction provides durability across a range of workpiece materials
• Six straight flutes with right-hand cutting direction for smooth, controlled material removal
• 7-inch overall length with 1-3/4-inch flute length balances reach and rigidity
• Bright, uncoated finish — suitable for use with cutting fluids standard to HSS tooling
• Straight-cylindrical shank compatible with standard drill chucks and collet holders

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and machining centers equipped with a chuck or collet capable of holding a straight-cylindrical shank in the 0.3930-inch diameter class.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with rotating cutting tool safety. Ensure the machine spindle is fully stopped and locked out before mounting or removing the reamer from the chuck or collet. Apply appropriate cutting fluid for the workpiece material to extend tool life and maintain hole finish quality. Do not use this reamer to remove excessive stock — pre-drill or bore the hole to near-final size before reaming.