Osg 1400108400 Thread Forming Tap 5-40 Unc Plug Cobalt

Product Description

The OSG 1400108400 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting or producing chips. Built from cobalt with a bright finish, this plug chamfer tap generates 5-40 UNC right-hand threads in through-hole applications. The H4 thread limit ensures dimensional control in close-tolerance work. At 1.938 inches overall length with a 0.141-inch shank diameter, it fits standard tap holders used across production and maintenance machining environments. Licensed machinists and tool-and-die professionals are the primary users for this type of tap.

This tap is suited for through-hole threading in a range of metallic workpiece materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The plug chamfer (4 to 4.5 chamfered threads) makes it appropriate for starting in through-holes where the tap can engage progressively. The HY-PRO NRT series is built for applications where chip evacuation is a concern and where thread forming is preferred over cutting to produce stronger, work-hardened threads.

Key Features

• Thread forming design produces no chips, reducing the need for chip evacuation in through-hole work
• Cobalt construction provides heat resistance for tapping harder and more abrasive materials
• Plug chamfer (4 to 4.5 threads) allows progressive engagement in through-holes
• H4 thread limit maintains dimensional accuracy in close-tolerance threading
• Right-hand, 5-40 UNC thread form compatible with standard unified coarse thread specifications
• Bright finish with no coolant-through requirement simplifies setup in standard tapping operations

Compatibility

Designed for through-hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P and N apply per the manufacturer specification.

Installation Notes

Thread forming taps require more torque than cutting taps of the same size - verify that the tapping equipment and tap holder are rated for the additional load. Use a cutting fluid or tapping lubricant appropriate for the workpiece material to reduce galling and extend tap life. Ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole before engagement. Follow applicable shop safety procedures and machine tool manufacturer guidelines when setting spindle speed and feed rate.