Osg 2885001 Spiral Point Tap 4-40 Unc 2 Flute Hss

Product Description

The OSG 2885001 is a spiral point plug tap designed for threading 4-40 UNC holes in metalworking applications. It is manufactured from high-speed steel with a steam oxide coating that helps reduce friction and resist wear during tapping operations. The tap features 2 flutes and a plug chamfer, making it well-suited for through-hole tapping where chips are pushed ahead of the cutting edge. With an H3 thread limit and a 2B class of fit, this tap produces threads that meet standard fastener tolerances for general mechanical assembly. Overall length is 1.875 inches with a thread length of 0.319 inches and a shank diameter of 0.141 inches. Machinists, tool-and-die makers, and maintenance professionals use this tap for precision small-diameter threading.

This tap is intended for right-hand threading in through-hole configurations across a range of common materials. It is rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. The spiral point geometry pushes chips forward rather than packing them into the flutes, which makes this tap a practical choice for production environments and repair work where clean chip evacuation matters. It is packaged as a single unit, suitable for both bench and machine tapping setups.

Key Features

• 4-40 UNC thread form with H3 thread limit for 2B class of fit tolerances
• Spiral point geometry pushes chips forward for efficient through-hole tapping
• High-speed steel construction provides durability across common ferrous and non-ferrous materials
• Steam oxide coating reduces friction and helps extend tool life
• Plug chamfer for standard entry and thread engagement
• Right-hand cut, no coolant-through requirement, non-interrupted thread profile

Compatibility

Rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. Designed for through-hole tapping in 4-40 UNC applications where a 2B class of fit is specified.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC machine spindle. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 4-40 UNC before tapping. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread finish. Do not force or back-drive the tap against binding resistance, as small-diameter taps are susceptible to breakage under torsional overload.