Osg 300-3160 Chucking Reamer Letter O Solid Carbide

Product Description

The OSG 300-3160 is a solid carbide chucking reamer designed to finish-ream holes to a precise 0.3160 inch diameter, corresponding to Letter O sizing. It delivers a diameter tolerance of +0.0001 to +0.0005 inches, making it suitable for close-tolerance bore work in production and job-shop environments. The bright, uncoated carbide construction provides rigidity and wear resistance across a range of workpiece materials. With an overall length of 3.25 inches and a flute length of 1.125 inches, this reamer fits standard chuck setups on mills, drill presses, and machining centers. It is intended for use by machinists and toolroom professionals requiring repeatable hole sizing.

This reamer is suited for general machining applications where a pre-drilled or bored hole needs to be brought to final diameter with consistent finish and tight dimensional control. The straight flute geometry and right-hand cutting direction make it appropriate for through-holes and blind holes in ferrous and non-ferrous materials. It is a standard production reamer used in manufacturing, maintenance, and repair operations where Letter O diameter holes are specified on engineering drawings.

Key Features

• Solid carbide construction for rigidity and extended tool life in abrasive or hard materials
• Diameter tolerance of +0.0001 to +0.0005 inches for close-tolerance hole finishing
• Straight flute, straight shank design for straightforward setup in standard chucks or collets
• Six flutes provide stable cutting action and consistent surface finish
• Bright, uncoated finish suitable for general-purpose machining without coating compatibility concerns
• Right-hand cutting direction for standard spindle rotation

Compatibility

Designed as an OEM-style replacement and standard production reamer for general machining applications requiring a Letter O (0.3160 inch) diameter finish bore in a straight-shank chucking configuration.

Installation Notes

Installation and use of this reamer 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 tool. The straight shank requires a properly sized collet or drill chuck with sufficient clamping force to prevent slippage under cutting loads. Reamers should follow a drilled or bored hole undersized by the appropriate stock allowance; do not attempt to use a reamer as a primary hole-making tool.