OSG Screw Thread Insert STI Tap: Spiral Fute, 9/16"-12 UNC, H4 / 2B-3B, 4 Flute
The OSG Screw Thread Insert STI Tap (MPN 30203201) is a spiral-flute tap for steel and stainless steel, sized 9/16"-12 UNC with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 4 flutes and is designed…
SKU 3G-OTH-244203
Need installation or engineering help?
Ask a question
Product Description
The OSG Screw Thread Insert STI Tap (MPN 30203201) is a spiral-flute tap for steel and stainless steel, sized 9/16"-12 UNC with an H4 / 2B-3B tolerance and a bottoming chamfer. It features 4 flutes and is designed for thread insert installation. 3G Electric sources this genuine OSG tool as part of our industrial supply across 14 departments, with specialist expertise in combustion, pumps, and controls.
Frequently Asked Questions
What is an OSG Screw Thread Insert STI Tap used for?
An OSG Screw Thread Insert STI Tap is used to cut internal threads in steel and stainless steel for installing helical wire thread inserts. It is commonly applied in aerospace, automotive, and heavy equipment manufacturing where thread repair or reinforcement is required.
What are the specifications of the OSG 30203201 STI Tap?
The OSG 30203201 is a spiral-flute STI tap with 9/16"-12 UNC thread, H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is designed for threading steel and stainless steel to accept screw thread inserts.
Where to buy OSG STI Taps worldwide?
3G Electric supplies OSG STI Taps worldwide, handling full logistics and customs clearance. As a global industrial sourcing partner, we provide genuine OSG taps like the 30203201 to customers across 14 industrial departments, including machining and tooling.
How to select the correct STI tap for thread inserts?
Select an STI tap that matches the insert's thread size and pitch, such as 9/16"-12 UNC. Use a bottoming chamfer for blind holes and a spiral-flute design for chip evacuation in steel. Verify the tap tolerance (e.g., H4 / 2B-3B) matches the required class of fit.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
