Osg 1410101005 Thread Forming Tap M2.5x0.45 Cobalt Tin

Product Description

The OSG 1410101005 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting. Rather than removing material, it displaces metal to produce stronger, work-hardened threads with no chip generation. Built from cobalt high-speed steel and finished with a TiN coating, this tap handles demanding applications including hardened steel and stainless steel. It is configured with a modified bottoming chamfer of 2 to 2.5 threads, allowing threads to be formed close to the bottom of a blind hole. The overall length is 1.813 inches and the thread length is 0.512 inches. Class of fit is 4H with a D3 thread limit, right-hand thread direction.

This tap is suited for blind hole threading in ferrous and non-ferrous materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The M2.5x0.45 Metric Coarse thread form makes it a common choice for small fastener tapping in precision machined components, fixture building, and production machining environments. It is typically used in CNC machining centers and drill presses by machinists and tooling specialists working to metric thread standards.

Key Features

• Thread forming design eliminates chips, reducing tap breakage risk in blind holes
• Cobalt HSS construction provides heat and wear resistance in tough alloys and stainless steel
• TiN coating reduces friction and extends tool life in production runs
• Modified bottoming chamfer allows threading near the bottom of blind holes
• 4H class of fit with D3 thread limit for consistent metric tolerance control
• Right-hand thread, M2.5x0.45 Metric Coarse — compatible with standard M2.5 fastener specifications

Compatibility

Designed for blind hole thread forming in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P and N apply per the supplier specification.

Installation Notes

Thread forming taps require a specific tap drill size larger than those used for cut taps — consult a forming tap drill chart for the correct pre-drill diameter before use. Adequate lubrication or cutting fluid is essential, particularly in stainless steel and hardened alloys, to reduce galling and tool wear. Ensure the workpiece is securely fixtured and that the tap is driven with controlled torque to avoid overload on this small diameter tool. This tool should be installed and operated by qualified machinists familiar with thread forming processes and applicable shop safety procedures.