OSG Screw Thread Insert STI Tap: Spiral Fute, 7/16"-20 UNF, H3 / 2B-3B
SKU 3G-OTH-281181
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is an OSG Screw Thread Insert STI Tap used for?
An OSG Screw Thread Insert STI Tap cuts internal threads in multiple materials to accept helical wire thread inserts. It is commonly used in aerospace, automotive, and general manufacturing to repair or reinforce tapped holes in aluminum, steel, and cast iron.
What are the specifications of the OSG STI Tap 7/16"-20 UNF?
This OSG STI Tap has a 7/16"-20 UNF thread size, H3 / 2B-3B tolerance, and a spiral-flute design with 3 flutes. The spiral flute helps evacuate chips upward, making it suitable for through-hole and blind-hole applications in multiple materials.
Where to buy OSG STI Taps worldwide?
3G Electric supplies OSG STI Taps worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner, we provide genuine OSG cutting tools like the 7/16"-20 UNF spiral-flute tap, ensuring you get the correct specification for your application.
How to select the correct OSG STI Tap for thread inserts?
Select an OSG STI Tap based on the thread insert's size and pitch, such as 7/16"-20 UNF. Ensure the tap tolerance (e.g., H3) matches the required class of fit (2B-3B). Use a spiral-flute design for blind holes or where chip evacuation is critical.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.



