OSG Screw Thread Insert STI Tap: Spiral Fute, 7/16"-14 UNC, H4 / 2B-3B

An OSG Screw Thread Insert STI Tap cuts internal threads in steel and stainless steel for installing helical wire thread inserts. It is commonly used in aerospace, automotive, and heavy equipment repair where stripped threads must be restored with a stronger, wear-resistant insert.

The OSG STI Tap 30202101 is a spiral-flute tap with thread size 7/16"-14 UNC, tolerance H4 / 2B-3B, and 3 flutes. It is designed for tapping holes that will accept screw thread inserts in steel and stainless steel. The spiral flute design aids chip evacuation in blind holes.

3G Electric supplies the OSG STI Tap 30202101 to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial solutions provider, we source genuine OSG taps and support your procurement with technical guidance on thread insert tapping.

Select an STI tap that matches the thread insert's size and class. For 7/16"-14 UNC inserts, use a tap with H4 tolerance for 2B-3B fit. OSG spiral-flute taps are ideal for steel and stainless steel blind holes. Always verify the tap's pitch and thread limit against the insert manufacturer's specifications.