Osg 1214405 Spiral Point Tap 12-28 Unf Tin Coated

Product Description

The OSG 1214405 is a spiral point plug tap designed for cutting internal threads in a wide range of metallic materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, this tap produces 12-28 UNF threads in a right-hand direction and is manufactured to a 2B class of fit with an H3 thread limit. The spiral point geometry pushes chips forward ahead of the cutting edge, making it well suited for through-hole tapping applications. At 2.375 inches overall length with a 0.52-inch thread length, it fits standard tap holders used in production and maintenance environments.

This tap is intended for through-hole threading operations in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The TiN coating extends cutting life by reducing friction and improving wear resistance. The 2-flute plug chamfer design provides a gradual lead-in, making it appropriate for both manual and machine tapping on production runs or service bench work. It is commonly used by machinists, maintenance technicians, and fabricators working in light industrial and manufacturing settings.

Key Features

• 12-28 UNF thread form, right-hand direction, 2B class of fit
• H3 thread limit for consistent dimensional control on tolerance-critical threads
• High-speed steel construction with TiN coating for extended tool life
• Spiral point geometry pushes chips forward, optimized for through-hole applications
• Plug chamfer provides gradual thread lead-in for reduced tap breakage risk
• Compatible with aluminum, cast iron, and a broad range of carbon and hardened steels

Compatibility

Designed for through-hole tapping of 12-28 UNF threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a standard tap wrench, tapping head, or CNC machine spindle rated for the thread size. Always secure the workpiece firmly and align the tap perpendicular to the hole before applying torque. Power down or de-energize any machine tool before changing taps or adjusting tooling. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality.