Osg 1101510405 Spiral Point Tap 1/4-20 Unc Tin Hss

Product Description

The OSG 1101510405 is a spiral point plug tap designed for threading 1/4-20 UNC right-hand threads in a wide range of metallic workpiece materials. Built from vanadium high-speed steel and finished with a titanium nitride (TiN) coating, this tap delivers extended tool life and reduced friction in production and maintenance tapping operations. The three-flute spiral point geometry pushes chips forward ahead of the tap, making it well suited for through-hole tapping. The H7 thread limit provides a controlled fit for standard UNC tolerance requirements. Overall length is 2.5 inches with a thread length of 0.752 inches and a shank diameter of 0.255 inches.

This tap is appropriate for use in both manual and machine tapping setups across job shop, maintenance, and light production environments. It is rated for use in aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, cast iron, high-nickel alloy, and titanium. The plug chamfer style requires a pre-existing hole and is the standard choice when tapping through-holes where chip evacuation in the cutting direction is acceptable. Machinists, tool-and-die makers, and maintenance technicians are the primary users.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• TiN coating increases surface hardness and reduces built-up edge on the cutting faces
• Vanadium high-speed steel substrate withstands the heat generated in harder workpiece materials
• H7 thread limit ensures controlled UNC fit across standard tolerance applications
• Plug chamfer provides gradual thread lead-in for smooth thread engagement
• No coolant-through requirement simplifies use in standard drill press and hand-tapping setups

Compatibility

Designed for through-hole tapping of 1/4-20 UNC threads in aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, cast iron, high-nickel alloy, and titanium workpieces.

Installation Notes

Install in a tap wrench, tapping head, or CNC spindle rated for the appropriate torque range for the workpiece material and tap size. Ensure the pilot hole diameter is correctly sized per UNC tap drill charts before starting. Apply cutting fluid appropriate to the workpiece material to extend tool life and improve thread finish. Never force the tap if resistance increases sharply — back off to clear chips before continuing.