Osg 1651503108 Spiral Point Tap 7/16-20 Unf Ticn

Product Description

The OSG 1651503108 is a high-performance spiral point tap designed to cut 7/16-20 UNF internal threads in a wide range of ferrous and non-ferrous materials. Built from powdered metal (PMT15 grade) and finished with a TiCN coating, this tap delivers extended tool life and resistance to heat and abrasion in demanding production environments. The plug chamfer provides a gradual lead-in for through-hole applications, while the spiral point geometry pushes chips forward ahead of the cutting zone to keep flutes clear. With an H3 thread limit and 3B class of fit, it produces threads within the tolerances required for general-purpose fastener assemblies. Machinists and toolroom professionals in industrial, MRO, and job-shop settings rely on this tap for consistent results across a broad material range.

This tap is suited for through-hole tapping operations in alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, and die steel. It is a strong fit for CNC machining centers, drill presses, and tapping machines where chip evacuation is a priority. The 3.937-inch overall length and 0.858-inch thread length accommodate standard toolholding setups for 7/16-inch taps in both production runs and single-piece work.

Key Features

• Powdered metal (PMT15) construction provides higher wear resistance than standard HSS
• TiCN coating reduces friction and extends tool life across abrasive and hard materials
• Spiral point geometry pushes chips forward for clean through-hole tapping
• Plug chamfer offers a gradual lead-in, reducing entry force in through-hole applications
• H3 thread limit and 3B class of fit meet general-purpose UNF thread tolerance requirements
• Right-hand cutting direction compatible with standard machine spindle rotation

Compatibility

Designed for through-hole tapping of 7/16-20 UNF threads. Compatible with alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, and die steel workpieces. Part of OSG Series 16515.

Installation Notes

This tap is intended for use by machinists and toolroom professionals operating CNC machining centers, drill presses, or dedicated tapping machines. Ensure the workpiece is securely fixtured and that spindle speed and feed rate are set per the tap manufacturer guidelines for the specific workpiece material before starting the cut. Use an appropriate cutting fluid or tapping compound for the material being threaded to maximize tool life and thread quality. Inspect the tap for wear or damage before each use and replace at the first sign of chipping or dull cutting edges.