Osg 1222600 Spiral Point Tap 1/2-20 Unf 3 Flute Hss

Product Description

The OSG 1222600 is a spiral point plug tap designed for threading 1/2-20 UNF right-hand internal threads in production and repair applications. Built from high-speed steel with a bright finish, this 3-flute tap uses a plug chamfer to distribute cutting forces across the lead threads, pushing chips forward through the hole. The H1 thread limit holds tight tolerances for consistent fit with standard UNF fasteners. Overall length is 3.375 inches with a shank diameter of 0.367 inches and a thread length of 0.941 inches. Licensed machinists, tool and die makers, and maintenance technicians are the primary users.

This tap is suited for through-hole threading operations across a broad range of materials. The spiral point geometry makes it particularly effective in through-holes where chips can evacuate forward rather than pack in the flutes. Material applications include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. It is appropriate for both CNC tapping and hand-tapping setups in job shop, production floor, and field maintenance environments.

Key Features

• 1/2-20 UNF thread form with right-hand direction and H1 thread limit for precise tolerance control
• 3-flute spiral point design pushes chips forward, reducing chip packing in through-hole applications
• Plug chamfer distributes cutting load across multiple lead threads for smoother entry
• High-speed steel construction provides durability across ferrous and non-ferrous materials
• Bright finish with no coolant-through requirement — compatible with flood coolant or tapping fluid applied externally
• No oversize or interrupted thread designation — standard production geometry

Compatibility

Designed for through-hole threading in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Part of OSG Series 105.

Installation Notes

Power down or de-energize any machine spindle before loading or removing the tap from the chuck or collet. Use appropriate tapping fluid or flood coolant for the material being threaded to extend tool life and improve thread quality. Ensure proper tap alignment with the drilled hole axis before engagement to avoid tap breakage, particularly in harder materials. Follow machine manufacturer guidelines for spindle speed and feed rate when using in a CNC or drill press application.