OSG Screw Thread Insert STI Tap: Spiral Point, 7/8"-9 UNC, H3 / 2B-3B, 4 Flute
The OSG Screw Thread Insert STI Tap: Spiral Point (MPN 31403601) is a 7/8"-9 UNC spiral-point tap with H3 / 2B-3B tolerance, 4 flutes, and a plug chamfer. Designed for threading multiple materials, it is supplied by…
SKU 3G-OTH-284628
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.
Need installation or engineering help?
Ask a question
Product Description
The OSG Screw Thread Insert STI Tap: Spiral Point (MPN 31403601) is a 7/8"-9 UNC spiral-point tap with H3 / 2B-3B tolerance, 4 flutes, and a plug chamfer. Designed for threading multiple materials, it is supplied by 3G Electric across 14 industrial departments, with specialist depth in combustion, pumps, and controls as an authorised distributor.
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 industrial maintenance to repair or reinforce tapped holes in aluminum, steel, and cast iron.
What are the specifications of the OSG STI Tap 31403601?
The OSG STI Tap 31403601 is a spiral-point, plug-chamfer tap with 4 flutes. It cuts a 7/8"-9 UNC thread and is ground to H3 / 2B-3B tolerance class. This tap is designed for through-hole threading in multiple materials.
Where to buy OSG STI Tap 31403601 worldwide?
3G Electric supplies the OSG STI Tap 31403601 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for a quote and lead time on this spiral-point tap for thread insert installation.
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 7/8"-9 UNC. The tap must be ground to the correct tolerance class (e.g., H3 / 2B-3B) to ensure the insert seats properly. Always verify the insert manufacturer's recommended tap drill size.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG spiral-point sti taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
