Titan Usa TT91058 Spiral Point Plug Tap 5/16-18 Unc Hss

Product Description

The TITAN USA TT91058 is a spiral point plug tap designed for through-hole threading operations in 5/16-18 UNC thread form. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap features a 2-flute spiral point geometry that pushes chips ahead of the cutting action rather than packing them behind it. The plug chamfer provides a balanced entry suitable for most standard through-hole applications. With an H2 thread limit and a 2B/3B class of fit, it delivers accurate thread geometry appropriate for general-purpose mechanical assemblies. The tap measures 2.7188 inches in overall length with a 1.125-inch thread length and a 0.318-inch shank diameter. Machinists and maintenance technicians use this tap in drill presses, CNC machining centers, and hand-tapping operations.

This tap is suited for general-purpose through-hole threading in ferrous and non-ferrous materials where a 5/16-18 UNC thread is required. Typical applications include fabrication shops, maintenance and repair operations, and production environments where clean thread form and chip evacuation are priorities. The spiral point design makes it especially effective in blind-through configurations where chips can be pushed forward and cleared from the cutting zone without interrupting the operation. Right-hand thread direction is standard for conventional 5/16-18 UNC fastener compatibility.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• Plug chamfer for general-purpose entry and balanced cutting load
• H2 thread limit with 2B/3B class of fit for accurate, consistent thread form
• High-speed steel construction for durability across general-purpose materials
• Bright/uncoated finish suitable for use with standard cutting fluids
• Right-hand thread direction, no coolant-through required

Compatibility

Designed for through-hole threading of 5/16-18 UNC fastener applications in general-purpose machining and maintenance operations. Fits standard tap holders and chucks accepting a 0.318-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a properly aligned tap holder, drill press, or CNC tapping cycle. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 5/16-18 UNC before starting. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Never force a tap against resistance — back off periodically to break and clear chips when hand-tapping.