Osg 2926801 Spiral Flute Tap 3/8-24 Unf Vanadium Hss

Product Description

The OSG 2926801 is a spiral flute tap designed for cutting 3/8-24 UNF internal threads in a wide range of ferrous materials. Built from vanadium high-speed steel with a steam oxide finish, this tap handles demanding threading operations in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The modified bottoming chamfer allows threading close to the bottom of blind holes. With a 45-degree helix angle and three right-hand spiral flutes, the tool efficiently evacuates chips upward out of the hole, reducing the risk of chip packing during through-hole and shallow blind-hole applications. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.

This tap is suited for production and job-shop environments where accurate UNF threads are required in tough materials. The H2 thread limit provides a controlled tolerance fit appropriate for standard fastener assemblies. The Series 290 designation places this tap in OSG's established line of spiral flute tooling for ferrous and difficult-to-machine workpieces. It is equally applicable in manual tapping fixtures and CNC machining centers with rigid tapping capability.

Key Features

• 3/8-24 UNF thread form, right-hand direction, H2 thread limit for controlled tolerance
• Vanadium high-speed steel construction for elevated wear resistance in hard materials
• Steam oxide coating reduces friction and improves lubrication retention
• 45-degree helix angle with three spiral flutes promotes upward chip evacuation
• Modified bottoming chamfer allows threading to near the bottom of blind holes
• No coolant-through design — compatible with flood coolant or tapping fluid applied externally

Compatibility

Designed for threading 3/8-24 UNF holes in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. Suitable for use in manual tapping setups and CNC rigid tapping applications within the OSG Series 290 product family.

Installation Notes

A licensed machinist or qualified tool operator should install and run this tap. Ensure the workpiece is securely fixtured and the spindle is properly aligned before engaging the tap. Always apply appropriate tapping fluid or cutting oil to extend tool life and achieve accurate thread form. When tapping blind holes, set depth stops carefully to avoid bottoming the tap under load.