Hertel 2291391 Chucking Reamer Size 39 Hss Straight Flute

Product Description

The HERTEL 2291391 is a wire gauge size 39 chucking reamer manufactured from high-speed steel (HSS), designed to produce precision-finished holes to a diameter of 0.0995 inches. With a straight flute geometry and straight-cylindrical shank, it chucks securely in standard drill press, lathe, or CNC collet setups. The 3.5-inch overall length and 0.875-inch flute length suit close-tolerance finishing passes in small-diameter bores. This reamer is intended for machinists and tool-and-die professionals working with ferrous and non-ferrous metals where hole finish and dimensional accuracy are critical.

Size 39 wire gauge reamers are commonly used in general machining, toolroom work, and production environments where small-diameter holes must meet tight tolerances after drilling. The straight-cylindrical shank allows use in collet chucks, drill chucks, and tailstock toolholders on manual and CNC lathes. This reamer is suited for through-hole and blind-hole finishing applications in steel, aluminum, brass, and similar materials where a consistent, smooth bore finish is required.

Key Features

• Wire gauge size 39 with a decimal diameter of 0.0995 inches for precise small-bore finishing
• HSS construction provides durability and wear resistance across a range of common workpiece materials
• Straight flute design suited for finishing passes in most ferrous and non-ferrous materials
• Straight-cylindrical shank for secure, concentric holding in standard drill and collet chucks
• 3.5-inch overall length with a 0.875-inch flute length balances reach and rigidity
• Not a dowel pin reamer and not an over/under size reamer — standard nominal diameter

Compatibility

Designed as an OEM-style chucking reamer compatible with standard drill press spindles, lathe tailstocks, and CNC collet systems accepting a straight-cylindrical shank of the appropriate diameter.

Installation Notes

Chucking reamers are installed and operated by machinists trained in precision hole finishing. Ensure the workpiece is securely fixtured and the spindle is aligned with the bore centerline before engaging the reamer. Reaming should be performed at lower RPM and higher feed rates than drilling, with appropriate cutting fluid applied to the flutes. Never run a reamer in reverse, as this dulls the cutting edges and degrades hole quality.