Osg 1405006408 Thread Forming Tap 12-24 Unc Bottoming

Product Description

The OSG 1405006408 is a thread forming tap designed for bottoming applications in blind hole threading. It carries a 12-24 UNC thread form, right-hand thread direction, and is manufactured from powdered metal high-speed steel with a TiCN (V) coating for improved wear resistance and tool life. The overall length is 2.375 inches, with a thread length of 0.4961 inches and a shank diameter of 0.2200 inches. Tapping depth reaches 0.9330 inches, making it well suited for close-tolerance blind holes where a full thread is needed near the bottom. This tap is installed by machinists, tool and die makers, and maintenance professionals working in precision threading applications.

This tap is engineered for use in a range of materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. It is best applied in blind hole threading scenarios where a bottoming chamfer of 1 to 1.5 threads is required. The H5 thread limit and Class 3B fit ensure tight dimensional control, making it appropriate for applications where thread quality and consistency are critical. It belongs to the EXOTAP VP-NRT series, which is built around cold-forming rather than cutting, eliminating chips from the threading process.

Key Features

• Thread forming (chipless) design eliminates chip buildup in blind holes
• Bottoming chamfer of 1 to 1.5 threads for threading close to hole bottom
• Powdered metal high-speed steel construction for consistent hardness and toughness
• TiCN (V) coating improves surface hardness and reduces friction during forming
• H5 thread limit with Class 3B fit for tight tolerance control
• Compatible with alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel

Compatibility

Suitable for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring a 12-24 UNC thread at Class 3B fit.

Installation Notes

Thread forming taps require a correctly sized forming hole - consult published forming tap drill charts for the 12-24 UNC size before drilling. Always power down or de-energize any machine tool before mounting the tap. Use a recommended tapping fluid or cutting oil appropriate for the workpiece material to reduce forming load and extend tool life. Do not exceed the rated tapping depth; overdriving a bottoming tap in a blind hole can fracture the tool or damage the workpiece thread.