Hertel K010459AS85 Thread Forming Tap M8x1.25 Bottoming Ticn

Product Description

The HERTEL K010459AS85 is a metric thread forming tap designed for bottoming applications in blind holes. Built from high-speed steel and coated with TiCN for extended wear resistance, this tap cold-forms internal M8x1.25 threads without cutting chips, reducing the risk of chip packing in blind bores. It carries a D9 thread limit and features a right-hand thread direction. Overall length is 2.7188 inches with a thread length of 1.125 inches and a shank diameter of 0.318 inches. Machinists and toolroom technicians install this tap in CNC machining centers, mills, and drill presses where clean, chip-free thread forming is required.

This tap is suited for blind hole threading in ductile, malleable materials such as aluminum, copper, mild steel, and similar metals that respond well to thread forming rather than thread cutting. The bottoming chamfer style with 1 to 2 chamfered threads allows the tap to form threads as close to the bottom of a blind hole as possible, making it a practical choice for close-tolerance assemblies where thread depth is critical. It is used in production and maintenance machining environments across manufacturing, tooling, and mechanical service trades.

Key Features

• M8x1.25 metric thread size for common metric fastener applications
• TiCN coating increases surface hardness and lubricity for longer tool life
• Bottoming chamfer with 1 to 2 chamfered threads maximizes usable thread depth in blind holes
• Thread forming design eliminates chips, reducing tap breakage risk in blind bores
• D9 thread limit for close-tolerance metric thread production
• Right-hand thread direction, no coolant-through feature

Compatibility

Designed as an OEM-style tooling replacement for M8x1.25 metric blind hole thread forming operations in standard tap holders and collet chucks accepting a 0.318-inch shank diameter with a 0.238-inch square drive.

Installation Notes

Install in a rigid tap holder or floating tap adapter sized for a 0.318-inch shank. Ensure the workpiece is securely fixtured and the spindle is properly aligned before threading begins. Apply appropriate tapping fluid or cutting oil compatible with the workpiece material to reduce friction and heat buildup. Thread forming taps require higher torque than cutting taps of the same size, so verify that the tapping torque does not exceed the holder or machine capacity.