OSG Screw Thread Insert STI Tap: Spiral Fute, M12x1.75 Metric, D4 / 4H-6H, 3 Flute

An OSG Screw Thread Insert STI Tap is used to cut internal threads in a pre-drilled hole before installing a helical wire thread insert. It is commonly applied in aerospace, automotive, and industrial maintenance to repair or strengthen threads in softer materials like aluminum or cast iron.

This OSG STI Tap has a metric M12x1.75 thread size, a D4 / 4H-6H tolerance class, 3 spiral flutes, and is made from high-speed steel. The manufacturer part number is 10900900. It is designed for cutting threads that accept screw thread inserts of the same nominal size.

3G Electric supplies the OSG STI Tap M12x1.75 (MPN 10900900) to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time; we source genuine OSG tooling across our 14 industrial departments.

Select an STI tap that matches the thread insert's nominal size and pitch, such as M12x1.75. The tap's tolerance class (e.g., D4 / 4H-6H) must align with the insert manufacturer's recommendation. Always use the correct drill size for the STI tap to ensure proper thread depth and insert fit.