Value Collection JY4761185 Spiral Point Tap 5/16-18 Unc

Product Description

The VALUE COLLECTION JY4761185 is a spiral point tap designed for threading 5/16-18 UNC holes in metalworking applications. Also called a gun tap, the spiral point design pushes chips forward ahead of the cutting edge, reducing clog risk in through-hole operations. Built from high speed steel with a bright, uncoated finish, this tap runs 2 flutes in a plug chamfer configuration, making it well suited for starting threads in pre-drilled through holes. The H11 thread limit indicates a slightly oversize tolerance — 0.005 inches oversize — which accommodates light plating or coating on finished fasteners. Machinists and toolroom techs reach for this style when threading steel, cast iron, and similar ferrous materials at moderate speeds.

This tap is intended for through-hole tapping operations on manual machines, drill presses, and CNC machining centers. The plug chamfer provides a gradual lead-in, making it a standard choice for production and repair tapping in metalworking shops, maintenance departments, and fabrication environments. Right-hand cutting direction matches standard right-hand threaded fastener specifications. The H11 oversize tolerance is particularly useful when the finished threaded hole will receive a plated or coated bolt where extra clearance prevents galling.

Key Features

• Spiral point geometry pushes chips forward for cleaner through-hole threading
• Plug chamfer provides gradual thread lead-in for controlled starts
• H11 thread limit with 0.005-inch oversize accommodates plated fasteners
• High speed steel construction handles ferrous and general-purpose materials
• Bright, uncoated finish for use with standard cutting fluids
• Right-hand thread direction matches standard UNC fastener specs

Compatibility

Designed for cutting 5/16-18 UNC right-hand threads in through-hole applications on manual or CNC equipment. Coolant-through capability is not supported; external cutting fluid application is recommended.

Installation Notes

This tap is installed and used by machinists and maintenance mechanics working on threading operations. Always secure the workpiece and use a properly sized tap holder or chuck to maintain axial alignment. Apply a suitable cutting fluid for the material being tapped to extend tool life and improve thread finish. Inspect the pre-drilled hole diameter against the recommended tap drill size for 5/16-18 UNC before tapping to avoid tool breakage.