Osg 1400117901 Thread Forming Tap 10-24 Unc Bottoming

Product Description

The OSG 1400117901 is a thread forming tap in the HY-PRO NRT series, designed for cold-form tapping of internal threads without cutting chips. Built from cobalt high-speed steel with a steam oxide finish, this bottoming chamfer tap produces 10-24 UNC threads in a right-hand direction to a Class 3B fit at an H4 thread limit. The bottoming chamfer — 1 to 1.5 chamfered threads — allows threading close to the bottom of a blind hole. Overall length is 2.375 inches with a shank diameter of 0.194 inches and a tapping depth of 0.866 inches. Licensed machinists and toolroom technicians use this tap for precision blind-hole applications in production and maintenance environments.

This tap is suited for blind-hole threading in a range of metallic materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The cold-forming action work-hardens the thread form, producing stronger internal threads compared to cut-tap methods. It is appropriate for CNC machining centers, drill presses, and manual tapping applications where a bottoming chamfer is required to reach full thread engagement near the bottom of a closed bore.

Key Features

• Bottoming chamfer with 1 to 1.5 chamfered threads for threading close to blind-hole bottoms
• Cobalt high-speed steel construction for improved heat and wear resistance in tough materials
• Steam oxide coating reduces friction and improves lubricant retention during tapping
• H4 thread limit to Class 3B fit for consistent, tight-tolerance thread production
• No coolant-through design — suitable for standard lubricated hand and machine tapping
• Right-hand thread direction, 24 threads per inch, 10-24 UNC standard

Compatibility

Designed for blind-hole thread forming in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces requiring 10-24 UNC internal threads to a Class 3B fit.

Installation Notes

Thread forming taps require a properly sized forming tap drill — do not use a standard cut-tap drill size, as the displaced material increases minor diameter. Apply a quality tapping fluid or cutting oil appropriate for the workpiece material before tapping. Secure the workpiece fully before engaging the tap, and ensure the tap is properly aligned to the bore axis to avoid tap breakage or off-axis threads. Follow OSHA and shop safety procedures when operating drill presses or CNC equipment.