Osg 2885901 Spiral Point Tap 5/16-24 Unf 3 Flute Hss

Product Description

The OSG 2885901 is a spiral point tap designed to cut 5/16-24 UNF internal threads in through-hole applications. It features a plug chamfer for gradual thread engagement and a steam oxide coating that improves lubricity and reduces chip welding during the tapping process. The tap is manufactured from high-speed steel, providing the hardness and wear resistance needed for repetitive production tapping. With 3 flutes and a spiral point geometry, it pushes chips ahead of the cut rather than packing them into the flute, making it well suited to through-hole work in softer metals and steel.

The OSG 2885901 is rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is commonly used in machine shop, maintenance, and light manufacturing environments where 5/16-24 UNF threaded holes are required in through-hole configurations. The plug chamfer makes it appropriate for both hand tapping and machine tapping setups where the tap enters a clear through-hole.

Key Features

• 5/16-24 UNF thread form with 2B class of fit for standard commercial thread tolerance
• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• 3-flute plug chamfer design for gradual thread engagement and balanced cutting forces
• Steam oxide coating improves lubricity and extends tool life in steel and aluminum
• High-speed steel construction provides hardness and toughness for production tapping cycles
• Right-hand thread direction; no coolant-through feature required for typical applications

Compatibility

Rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. Designed as a standard 5/16-24 UNF spiral point plug tap for through-hole tapping operations in compatible materials.

Installation Notes

Installation is performed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC machine with appropriate spindle speed and feed for the work material. Cutting fluid or tapping compound should be applied to extend tool life and improve thread quality. Ensure the workpiece is securely fixtured and the hole is drilled to the correct tap drill diameter for a 2B class of fit before tapping. Do not reverse the tap under load without first relieving chip pressure to avoid tap breakage.