Osg 1415003108 Thread Forming Tap M8x1.25 Bottoming Hss

Product Description

The OSG 1415003108 is a thread forming tap in the EXOTAP VP-NRT series, designed for M8x1.25 metric coarse threads in blind hole applications. Unlike cut taps, this forming tap displaces material rather than cutting it, producing stronger threads with no chips to clear. It is manufactured from powdered metal high-speed steel with a TiCN coating and carries a D9 thread limit with a right-hand thread direction and a Class 2B fit. Licensed machinists and CNC setup technicians working in production or job-shop environments are the primary users of this tooling.

This tap is suited for bottoming applications where threads must extend close to the bottom of a blind hole. With 1 to 1.5 chamfered threads, it can engage near the floor of a hole with minimal clearance. The EXOTAP VP-NRT series is built for use across a wide range of workpiece materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel, making it a versatile choice for mixed-material production runs where a single tap solution is preferred.

Key Features

• Thread forming design displaces material rather than cutting, eliminating chips in blind hole operations
• Powdered metal high-speed steel construction provides consistent grain structure and wear resistance
• TiCN coating reduces friction and extends tool life across ferrous and non-ferrous materials
• Bottoming chamfer with 1 to 1.5 chamfered threads for threading close to hole bottom
• D9 thread limit and Class 2B fit for standard metric coarse thread tolerance
• Right-hand thread direction, compatible with standard tapping attachments and CNC spindles

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. Fits standard tap holders and tapping attachments sized for an 8.08 mm shank diameter with a 6.05 mm square drive.

Installation Notes

Thread forming taps require a specific forming tap drill size, which differs from standard cut tap drill sizes — consult a forming tap drill chart for the correct pilot hole diameter before use. Secure the workpiece and verify spindle speed and feed rate are appropriate for the workpiece material and tap diameter. Use a tapping fluid or cutting oil suitable for the workpiece material to minimize tool wear and maintain thread quality. Inspect the pilot hole depth before tapping to confirm adequate clearance for the full tapping depth of 1.126 inches.