OSG Screw Thread Insert STI Tap: Spiral Fute, 7/16"-20 UNF, H3 / 2B-3B, 3 Flute
The OSG Screw Thread Insert STI Tap (SKU 8017400, MPN 8017400) is a spiral-flute tap for 7/16"-20 UNF threads, with an H3 / 2B-3B tolerance class and a bottoming chamfer. It features 3 flutes and is designed for…
SKU 3G-OTH-273386
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 (SKU 8017400, MPN 8017400) is a spiral-flute tap for 7/16"-20 UNF threads, with an H3 / 2B-3B tolerance class and a bottoming chamfer. It features 3 flutes and is designed for thread-forming insert installation.
Frequently Asked Questions
What is an OSG spiral-flute STI tap used for?
An OSG spiral-flute STI tap is used to cut internal threads in a workpiece before installing a screw thread insert. It is designed for bottoming chamfer applications, producing threads to H3 / 2B-3B tolerance. Common in aerospace, automotive, and general manufacturing where strong, replaceable threads are needed.
What are the specifications of the OSG 8017400 STI tap?
The OSG 8017400 is a spiral-flute STI tap with a 7/16"-20 UNF thread size, H3 / 2B-3B tolerance, 3 flutes, and a bottoming chamfer. It is designed for threading holes that will accept screw thread inserts. The spiral flute design aids chip evacuation in blind-hole applications.
Where to buy OSG STI taps worldwide?
You can source OSG STI taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your facility. Contact us for availability and lead time on the OSG 8017400 or other OSG threading tools.
How to select the correct STI tap size for a UNF thread?
To select the correct STI tap, match the tap's thread designation to the insert's thread size. For a 7/16"-20 UNF insert, use an STI tap with the same 7/16"-20 UNF marking. The tap's H3 / 2B-3B tolerance ensures the tapped hole meets the insert manufacturer's requirements. Always verify the chamfer type (bottoming vs. plug) for your application.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
