OSG Screw Thread Insert STI Tap: Spiral Fute, 9/16"-12 UNC, H4 / 2B-3B

An OSG Screw Thread Insert STI Tap cuts internal threads in steel and stainless steel to accept helical wire thread inserts. It is commonly used in aerospace, automotive, and heavy equipment repair where stripped threads must be restored to original strength without replacing the parent component.

The OSG 30203108 is a spiral-flute STI tap with thread size 9/16"-12 UNC, 4 flutes, and tolerance class H4 / 2B-3B. It is designed for threading holes that will receive screw thread inserts in steel and stainless steel workpieces.

3G Electric supplies OSG STI taps like the 30203108 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for a quote and lead time on this spiral-flute tap for steel and stainless steel applications.

Select an STI tap that matches the original thread size and pitch, such as 9/16"-12 UNC, and the required tolerance class (e.g., H4 / 2B-3B). The tap diameter is oversized relative to a standard tap to accommodate the thread insert. Always verify the insert manufacturer's recommended drill and tap specifications.