Osg 1400130508 Thread Forming Tap 5/16-18 Unc Cobalt Ticn

Product Description

The OSG 1400130508 is a thread forming tap designed for cold-forming internal threads without cutting, producing stronger threads by displacing material rather than removing it. Built from cobalt high-speed steel and coated with titanium carbonitride (TiCN), this tap handles demanding applications in alloy steel, carbon steel, stainless steel, hardened steel, die steel, and aluminum. It carries a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing it to form threads close to the bottom of a blind hole. The H3 thread limit ensures dimensional consistency across production runs. With an overall length of 2.719 inches and a shank diameter of 0.318 inches, this tap fits standard tap holders used by machinists and tool-and-die professionals.

This tap is suited for blind hole threading operations in both production and job-shop environments. The 5/16-18 UNC thread form is a common fastener size across structural, mechanical, and industrial assemblies. Its right-hand thread direction matches standard machine tapping setups. The TiCN coating reduces friction and extends tool life when running in abrasive or work-hardening materials such as stainless steel and hardened steel. It is part of the OSG HY-PRO NRT series, which is engineered for roll-form tapping in ferrous and non-ferrous metals.

Key Features

• Modified bottoming chamfer with 2 to 2.5 chamfered threads for near-bottom thread forming in blind holes
• Cobalt high-speed steel construction for increased heat and wear resistance
• TiCN coating reduces friction and improves tool life in abrasive materials
• H3 thread limit for consistent tolerance control in production tapping
• Right-hand, 5/16-18 UNC thread form covers a broad range of standard fastener applications
• Compatible material applications include alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring a 5/16-18 UNC internal thread. Part of the OSG HY-PRO NRT series, Series 14001.

Installation Notes

This tap is installed by machinists using standard tap holders or CNC tapping attachments sized for a 0.318-inch shank diameter. Ensure the spindle and workpiece are properly secured before tapping. Use a cutting fluid or tapping compound appropriate for the workpiece material to reduce heat buildup and extend tool life. Confirm hole diameter and depth meet the thread forming requirements for 5/16-18 UNC before starting the operation.