Osg 300-3438 Chucking Reamer 11/32 in Solid Carbide

Product Description

The OSG 300-3438 is a solid carbide chucking reamer designed for precision hole finishing in general machining applications. Built to Series 300D standards, it produces close-tolerance bores with a reamer diameter of 0.3438 inches (11/32 inches) and holds a diameter tolerance of +0.0001 to +0.0005 inches. The straight flute geometry and right-hand cutting direction make it well suited for through-holes and short blind-hole finishing where chip evacuation is straightforward. With an overall length of 3.5 inches and a 1.25-inch flute length, this reamer is compact enough for typical CNC machining center setups. The bright, uncoated carbide surface is appropriate for use on aluminum, brass, and other non-ferrous materials as well as some steels.

This chucking reamer is intended for use in machine tool spindles, including CNC machining centers, knee mills, and drill presses equipped with a collet chuck or drill chuck. Its straight-cylindrical shank allows secure clamping in standard ER collets and Jacobs-style chucks. The 6-flute configuration improves surface finish quality compared to lower-flute-count reamers, making it a practical choice for production environments where consistent bore quality is required. It is sold individually and suited for tool crib stock in job shops and production facilities.

Key Features

• Solid carbide construction provides rigidity and wear resistance for consistent sizing over high cycle counts
• 6-flute straight design delivers improved surface finish in through-hole reaming operations
• Diameter tolerance of +0.0001 to +0.0005 inches suits close-fit dowel pin and bearing bore applications
• Bright, uncoated finish — no coating adhesion concerns when working with aluminum or brass
• Straight-cylindrical shank is compatible with standard ER collets and drill chucks
• Compact 3.5-inch overall length fits short-reach setups without excessive overhang

Compatibility

Designed as an OEM-style solid carbide chucking reamer for general machining applications requiring a 0.3438-inch finished bore diameter in a straight-shank, straight-flute configuration.

Installation Notes

This reamer should be installed and operated by a qualified machinist or CNC operator. Secure the straight shank in a properly sized collet or chuck and verify runout before cutting to avoid bell-mouthing the bore. Power down the machine spindle completely before tool changes. Do not use this reamer as a drill — always pre-drill or bore the hole to within a few thousandths of final size before reaming.