Osg 2926408 Spiral Flute Tap 5/16-24 Unf Ticn Vanadium Hss

Product Description

The OSG 2926408 is a spiral flute tap designed for cutting internal threads in a range of ferrous materials. Built from vanadium high-speed steel with a titanium carbonitride (TiCN) coating, it delivers extended tool life in demanding production and maintenance environments. The tap cuts a 5/16-24 UNF right-hand thread with a 45-degree helix angle and a modified bottoming chamfer, making it well suited for threading holes close to the bottom of a blind bore. Machinists, toolroom technicians, and maintenance mechanics install this tap in manual tapping equipment, CNC machining centers, or drill press setups.

The OSG 2926408 is appropriate for threading operations in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. The modified bottoming chamfer allows thread engagement closer to the bottom of a blind hole than a standard taper chamfer, making it useful in fixture machining, tooling fabrication, and repair work where full thread depth is required in a confined bore depth. The Series 290 designation places it within OSG's standard spiral flute tap family for general-purpose and precision threading applications.

Key Features

• TiCN coating reduces friction and extends tap life in ferrous and hardened materials
• 45-degree right-hand spiral flute geometry evacuates chips up and out of blind holes
• Modified bottoming chamfer for threading close to the bottom of blind bores
• H2 thread limit for close-tolerance UNF thread production
• Vanadium high-speed steel construction provides wear resistance without carbide brittleness
• Compatible with alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel

Compatibility

Designed for use with 5/16-24 UNF thread applications in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. Fits standard tap holders and chucks accepting a 0.255-inch shank diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using manual tap wrenches, tapping arms, or CNC rigid-tapping programs. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for a 5/16-24 UNF H2 thread before starting. Apply an appropriate cutting fluid or tapping compound for the workpiece material; do not run dry in stainless or hardened steel. Inspect the tap for wear or chipping before each use and replace at the first sign of thread-form degradation.