Osg 1400139100 Thread Forming Tap 7/16-14 Unc Cobalt H4

Product Description

The OSG 1400139100 is a thread forming tap designed for 7/16-14 UNC right-hand threading in blind hole applications. Part of the HY-PRO NRT series, it is manufactured from cobalt high-speed steel with a bright finish and carries an H4 thread limit for precise tolerance control. The modified bottoming chamfer features 2 to 2.5 chamfered threads, allowing the tap to reach close to the bottom of a blind hole. Overall length is 3.156 inches with a shank diameter of 0.323 inches. This tap is suited for production threading operations performed by machinists and tool and die professionals.

The 1400139100 is built for blind hole threading across a range of ferrous and non-ferrous workpiece materials. Its cobalt construction makes it well-suited for demanding cuts in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The HY-PRO NRT design uses a thread forming rather than thread cutting action, displacing material rather than producing chips, which is advantageous in blind hole setups where chip evacuation is a concern.

Key Features

• 7/16-14 UNC thread size with right-hand thread direction
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for near-bottom reach in blind holes
• Cobalt high-speed steel construction for durability in alloy steel, stainless steel, and hardened steel
• H4 thread limit for consistent tolerance performance
• Bright finish with no coolant-through requirement, suitable for standard tapping setups
• Thread forming action eliminates chip production in blind hole applications

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Carries material application codes P and N per the HY-PRO NRT series specification.

Installation Notes

Installation is performed by machinists using a tapping machine, CNC machining center, or hand tap wrench rated for the torque required by a 7/16-14 forming tap. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for thread forming, as forming taps require a larger pilot hole than cutting taps for the same thread size. Apply appropriate tapping fluid or cutting oil rated for the workpiece material before and during the tapping operation. Power down and de-energize any machine before changing or inspecting the tap.