OSG Screw Thread Insert STI Tap: Spiral Fute, 5/8"-11 UNC, H4 / 2B-3B, 4 Flute
The OSG Screw Thread Insert STI Tap is a spiral-flute tap designed for steel and stainless steel, featuring a 5/8"-11 UNC thread size with H4 / 2B-3B tolerance and a bottoming chamfer. This 4-flute tap (MPN 30203901)…
SKU 3G-OTH-244389
Local availability & support — Singapore
- Local office
- 20 Woodlands Link #09-05, Singapore 738733
- Phone
- +65 8878 8355
- Delivery
- Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
- Payment
- Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
- Ships to
- Singapore
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Product Description
The OSG Screw Thread Insert STI Tap is a spiral-flute tap designed for steel and stainless steel, featuring a 5/8"-11 UNC thread size with H4 / 2B-3B tolerance and a bottoming chamfer. This 4-flute tap (MPN 30203901) is engineered for threading holes that will accept screw thread inserts, ensuring precise internal threads in demanding materials.
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 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 to original strength without replacing the parent component.
What are the specifications of the OSG 30203901 STI Tap?
The OSG 30203901 is a spiral-flute STI tap with 5/8"-11 UNC thread, H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is designed for threading holes in steel and stainless steel before inserting screw thread inserts. The H4 pitch diameter tolerance ensures a precise fit for the insert.
Where to buy OSG STI Taps worldwide?
3G Electric supplies OSG STI Taps like the 30203901 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. As a global industrial sourcing partner, we provide genuine OSG cutting tools for maintenance and production needs across 14 industrial departments.
How to select the correct STI tap size for a thread repair?
Select an STI tap that matches the original thread size and pitch, such as 5/8"-11 UNC. The tap must be marked for screw thread inserts (STI) and have the correct tolerance class (e.g., H4 / 2B-3B). Use a bottoming chamfer for blind holes and a spiral-flute design for chip evacuation in steel and stainless steel.
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.
