Osg 1400118401 Thread Forming Tap 10-24 Unc Cobalt

Product Description

The OSG 1400118401 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting or chip generation. It produces a 10-24 UNC right-hand thread using a modified bottoming chamfer with 2 to 2.5 chamfered threads, making it well suited for blind hole applications where thread depth control is critical. Constructed from cobalt high-speed steel with a steam oxide coating, this tap offers improved lubricity and resistance to wear and galling. Overall length is 2.375 inches with a thread length of 0.492 inches and a tapping depth of 0.866 inches. Licensed machinists and tool-and-die technicians install this tap in CNC machining centers, drill presses, and tapping machines.

This tap is intended for blind hole threading in a range of metallic materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The modified bottoming chamfer allows threading close to the bottom of a blind hole, which is a common requirement in precision machined components, fastener bosses, and structural assemblies across industrial, aerospace, and automotive applications. It carries a Thread Limit of H5, which defines the pitch diameter tolerance and ensures consistent fit with standard UNC fasteners across production runs.

Key Features

• Thread forming design eliminates chips, reducing tap breakage risk in blind hole operations
• Cobalt construction provides elevated heat and wear resistance compared to standard HSS
• Steam oxide coating improves surface lubricity and corrosion resistance
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for close-to-bottom threading in blind holes
• H5 thread limit ensures controlled pitch diameter for consistent UNC thread fitment
• Right-hand thread direction; no coolant-through requirement simplifies tooling setup

Compatibility

Rated for use in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P and N apply. Designed for blind hole threading applications requiring a 10-24 UNC thread form.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which differs from a standard cut tap drill size — consult a thread forming drill chart before setup. Ensure the workpiece is securely fixtured and the tap is driven with a synchronized tapping head or CNC rigid tapping cycle to prevent thread distortion. Apply an appropriate tapping fluid or cutting oil for the workpiece material before starting. Power down and de-energize all machine drives before changing or inspecting tooling.