OSG Screw Thread Insert STI Tap: Spiral Point, 1/2"-20 UNF, H3 / 2B-3B, 3 Flute
The OSG Screw Thread Insert STI Tap is a spiral-point tap designed for installing screw thread inserts in 1/2"-20 UNF applications. It features an H3 / 2B-3B tolerance, 3 flutes, and a plug chamfer (MPN 12500700).
SKU 3G-OTH-286990
Local availability & support
- Delivery
- Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
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Product Description
The OSG Screw Thread Insert STI Tap is a spiral-point tap designed for installing screw thread inserts in 1/2"-20 UNF applications. It features an H3 / 2B-3B tolerance, 3 flutes, and a plug chamfer (MPN 12500700).
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 a pre-drilled hole to accept a helical wire thread insert. It is used in industrial maintenance and production applications where stripped or worn threads must be repaired or reinforced, particularly in softer materials like aluminum or cast iron.
What are the specifications of the OSG STI Tap 12500700?
The OSG STI Tap 12500700 is a spiral-point, plug-chamfer tap with a 1/2"-20 UNF thread, H3 / 2B-3B tolerance, and 3 flutes. It is designed for through-hole tapping and produces threads that accept screw thread inserts. The spiral point pushes chips ahead, reducing clogging.
Where to buy OSG STI Tap 12500700 worldwide?
3G Electric supplies the OSG STI Tap 12500700 to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial sourcing partner, we provide genuine OSG taps and can quote for both single units and production quantities.
How to select the correct STI tap size for a thread insert?
Select an STI tap that matches the thread insert's nominal size and pitch, such as 1/2"-20 UNF. The tap tolerance (e.g., H3 / 2B-3B) must align with the insert manufacturer's recommendation. Always drill the correct STI tap drill hole diameter before tapping to ensure proper insert fit and thread strength.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-point sti taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
