Osg 1400100000 Thread Forming Tap 0-80 Unf Bottoming Cobalt

Product Description

The OSG 1400100000 is a thread forming tap designed for producing 0-80 UNF internal threads in blind holes without cutting or removing material. It operates by cold-forming the thread profile, which results in stronger threads and no chips to clear from the hole. Made from cobalt high-speed steel with a bright finish, it carries a thread limit of H2 and a class of fit rating of 3B. The bottoming chamfer — 1.5 to 2 chamfered threads — allows threading close to the bottom of a blind hole. Overall length is 1.6913 inches with a tapping depth of 0.3500 inches. This tap is part of the HY-PRO NRT series and is sized for right-hand thread direction at 80 threads per inch.

This tap is used for blind hole threading operations on small-diameter fastener applications in precision machining environments. The 0-80 UNF thread size is common in instrument work, electronics assemblies, optical equipment, and fine-mechanism components. It is suited for use on alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Machinists and tool-and-die professionals typically deploy this tap in CNC tapping centers or manual drill presses with a tapping head, where controlled feed rate and proper lubricant selection are critical to thread quality.

Key Features

• Thread forming design eliminates chips, reducing risk of chip packing in blind holes
• Cobalt construction provides heat resistance for tapping harder and stainless steel alloys
• Bottoming chamfer (1.5-2P) allows threading close to the bottom of a blind bore
• H2 thread limit and 3B class of fit for standard precision tolerance requirements
• Right-hand thread direction, 80 TPI, conforming to UNF standards
• Bright finish — no coating added — suitable for use with standard tapping fluids

Compatibility

Designed for blind hole thread forming in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. Material application codes P and N apply. Compatible with standard 0-80 UNF toolholders and tapping heads sized for a 0.1410-inch shank diameter.

Installation Notes

Thread forming taps require a properly sized forming tap drill — the pilot hole diameter is larger than a standard cut-tap drill and must be held to close tolerance to achieve the correct class of fit. Always apply a tapping compound or cutting fluid rated for the workpiece material before tapping, especially on stainless steel and hardened alloys. Secure the workpiece fully and align the tap perpendicular to the hole to prevent tap breakage at this small diameter. Follow machine shop safety practices and applicable workplace standards when operating tapping equipment.