OSG Screw Thread Insert STI Tap: Spiral Fute, M4x0.7 Metric, D3 / 4H-6H, 3 Flute

An OSG Spiral-Flute STI Tap is used to cut internal threads in pre-drilled holes for screw thread inserts. It is ideal for high-speed production tapping in materials like steel and aluminum, where chip evacuation is critical. The spiral flute design pushes chips forward, reducing clogging and improving thread quality.

The OSG STI Tap has a metric M4x0.7 thread size, a D3 / 4H-6H tolerance class, and 3 flutes. It is made from high-speed steel (HSS) and features a spiral flute design. The manufacturer part number is 10900400. This tap is designed for use with screw thread inserts requiring a 4H-6H fit.

You can source OSG STI Taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead times. We supply genuine OSG tooling for manufacturing and maintenance applications globally.

To select the correct OSG STI Tap, match the thread size (e.g., M4x0.7) and tolerance class (D3 / 4H-6H) to your insert requirements. Consider material hardness and tap flute design—spiral flute for through holes, spiral point for blind holes. Always use proper tapping speed and lubrication for HSS tools to extend tool life.