Titan Usa TR97474 Solid Pilot Counterbore 0.312 in 4 Flute Hss

Product Description

The TITAN USA TR97474 is a solid pilot counterbore designed for precise counterboring operations in metal fabrication and machining environments. Built from high speed steel (HSS) with a bright, uncoated finish, this tool delivers a 0.312-inch counterbore diameter and a 0.19-inch standard pilot diameter across 4 flutes for clean, accurate seat formation. The 9/32-inch shank diameter and 5.25-inch overall length make it compatible with standard drill press and milling setups. Machinists and tool-and-die professionals rely on this type of counterbore to create flat-bottomed recesses that allow cap screw heads to sit flush or below a workpiece surface.

This counterbore is sized for use with No. 10 cap screws, making it a common selection for light mechanical assemblies, fixture fabrication, and general machine shop work. It is suited for use in ferrous and non-ferrous metals where a standard HSS tool meets the hardness requirements of the workpiece. The standard pilot configuration locates the tool accurately in a pre-drilled clearance hole, ensuring concentricity between the pilot bore and the counterbore seat.

Key Features

• 0.312-inch counterbore diameter (5/16 inch fractional equivalent) for No. 10 cap screw compatibility
• 0.19-inch standard pilot diameter ensures accurate self-location in pre-drilled holes
• 4-flute geometry for efficient chip clearance and smooth seat finish
• High speed steel construction provides durability across a range of metalworking applications
• Bright, uncoated finish — no coating to flake or interfere with tight-tolerance fits
• 9/32-inch shank diameter fits standard collets and drill chuck configurations

Compatibility

Designed for use with No. 10 cap screws. Sized to counterbore clearance holes in applications where a 5/16-inch counterbore seat is required. Confirm workpiece material hardness is within the rated range of high speed steel tooling before use.

Installation Notes

This counterbore is installed and operated by machinists using a drill press, milling machine, or similar rotating spindle equipment. Always secure the workpiece firmly and ensure the spindle speed is appropriate for the workpiece material and tool diameter before starting the cut. Power down and lock out the machine before changing or inspecting tooling. Do not exceed the tool's rated speed range for HSS cutters in hard ferrous materials.