Osg 300-1378 Chucking Reamer 3.5mm Solid Carbide

Product Description

The OSG 300-1378 is a solid carbide chucking reamer designed for precision hole finishing in general machining applications. With a 3.5 mm (0.1378 inch) diameter and a diameter tolerance of +0.0001 to +0.0004 inches, this reamer delivers consistent, repeatable bore sizing in production and job-shop environments. The straight-flute, right-hand-cut geometry and bright uncoated carbide construction make it well suited for reaming a wide range of ferrous and non-ferrous workpiece materials. Machinists and toolroom technicians install this tool in CNC machining centers, lathes, and drill presses where tight bore tolerances are required.

The 300-1378 belongs to OSG Series 300D and is intended for standard general machining applications where a straight-cylindrical shank and straight flute profile are preferred. The 64 mm overall length and 19 mm flute length suit typical shallow-to-moderate depth reaming passes in small-diameter bores. It is commonly used in metalworking shops, precision component manufacturing, and maintenance machining. No coolant-through capability means it is best applied with external coolant or cutting fluid as appropriate for the material and machine setup.

Key Features

• 3.5 mm (0.1378 inch) diameter with tight tolerance of +0.0001 to +0.0004 inches for precise bore finishing
• Solid carbide construction for rigidity, wear resistance, and dimensional stability
• Straight-flute, right-hand-cut geometry suited to general machining on a broad range of materials
• Bright uncoated finish — no coating buildup concerns on close-tolerance work
• Straight-cylindrical shank for direct chucking in standard collets or drill chucks
• 4-flute design balances cutting action and chip clearance in small-diameter bores

Compatibility

Designed as a standard solid carbide chucking reamer for general machining applications requiring a 3.5 mm diameter straight-shank tool. Compatible with any machine spindle or chuck accepting a straight-cylindrical shank of this diameter.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist following standard shop safety practices. Ensure the machine spindle is fully stopped and the tool is securely seated and locked in the collet or chuck before operation. Apply appropriate cutting fluid or external coolant to the workpiece for proper chip evacuation and tool life. Inspect the reamer for chipping or wear before each use, as solid carbide tooling is brittle and should not be used if edge damage is present.