Osg 1400106405 Thread Forming Tap 4-48 Unf Cobalt Tin

Product Description

The OSG 1400106405 is a thread forming tap in the HY-PRO NRT series, designed for producing internal threads without cutting chips. Operating on a 4-48 UNF thread profile with a modified bottoming chamfer of 2 to 2.5 threads, it displaces material rather than removing it, resulting in stronger thread forms and cleaner blind hole results. Constructed from cobalt high-speed steel and finished with a titanium nitride (TiN) coating, this tap handles demanding applications where tool life and surface hardness matter. Overall length is 1.875 inches with a shank diameter of 0.141 inches. Licensed HVAC technicians, machinists, plumbers, and precision fabricators working with tight-tolerance fastener threads will find this tap well suited to production and repair work.

The 1400106405 is intended for blind hole threading across a range of ferrous and non-ferrous materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The right-hand thread direction and H2 thread limit make it appropriate for close-tolerance tapping where dimensional consistency across multiple holes is required. Typical applications include component fabrication, repair threading in mechanical assemblies, and production runs where chip-free thread forming is preferred over conventional cutting taps.

Key Features

• Thread forming design produces chip-free internal threads, reducing blind hole clogging risk
• Cobalt construction provides increased heat and wear resistance compared to standard HSS
• TiN coating extends tool life and reduces friction during forming
• Modified bottoming chamfer (2 to 2.5 threads) allows threading close to the bottom of blind holes
• H2 thread limit supports close-tolerance 4-48 UNF thread production
• Right-hand thread direction; compatible with standard tapping equipment and tap handles

Compatibility

Designed for blind hole thread forming in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring a 4-48 UNF internal thread. Material application codes P and N apply.

Installation Notes

Thread forming taps require the correct tap drill size for the material and desired thread engagement — consult published UNF forming tap drill charts before drilling. Apply appropriate tapping fluid or cutting oil for the workpiece material, particularly when working with stainless steel or hardened steel. Use a calibrated torque-limiting tap handle or CNC tapping cycle with rigid tapping to avoid tap breakage in small-diameter applications. Verify the spindle is properly aligned before engaging the tap to prevent cross-threading or tool deflection.