Osg 1410104305 Thread Forming Tap M8x1.25 Cobalt Tin

Product Description

The OSG 1410104305 is a bottoming-style thread forming tap designed for M8x1.25 metric coarse threading applications. Part of the HY-PRO NRT series, this tap is manufactured from cobalt high-speed steel and finished with a TiN (titanium nitride) coating to extend tool life and reduce friction during tapping. It forms threads by displacing material rather than cutting, eliminating chips and producing stronger thread forms. With an overall length of 2.7165 inches (69.10 mm) and a thread length of 0.5906 inches (15.00 mm), it is suited for tight-tolerance work requiring a 6H class of fit with a D9 thread limit. Installed by machinists and toolroom technicians in production and MRO environments.

This tap is intended for blind hole threading operations where chip evacuation is a concern and thread strength is critical. The bottoming chamfer, with 1 to 1.5 chamfered threads, allows threading close to the bottom of a blind hole. It is rated for use in a broad range of workpiece materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum, making it a versatile option for general machining and precision fabrication shops.

Key Features

• Thread forming (chipless) design eliminates chip-related blind hole complications
• Cobalt HSS construction provides heat and wear resistance in difficult materials
• TiN coating reduces friction and extends tool life across high-volume applications
• Bottoming chamfer (1-1.5P) enables threading near the base of blind holes
• 6H class of fit with D9 thread limit for standard metric tolerance requirements
• Right-hand thread direction, no coolant-through design

Compatibility

Designed for M8x1.25 metric coarse blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Suitable for use with standard machine tapping setups and hand tapping where a bottoming profile is required.

Installation Notes

This tap should be installed in a properly sized tap holder or tapping chuck rated for the shank diameter of 0.3180 inches. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct diameter for M8x1.25 thread forming before beginning the operation. Apply appropriate tapping fluid or cutting oil for the workpiece material, even though the forming process is chipless. Inspect the tap for wear or deformation before each use, particularly when working in hardened steel.