OSG Screw Thread Insert STI Tap: Spiral Fute, 7/8"-9 UNC, H5 / 2B-3B, 4 Flute (MPN 31503708)
SKU 3G-OTH-281160
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Frequently Asked Questions
What is the OSG Screw Thread Insert STI Tap used for?
The OSG Screw Thread Insert STI Tap is used to cut internal threads for helical coil thread inserts in multiple materials. It is designed for applications requiring strong, wear-resistant threads in metals and alloys, commonly used in automotive, aerospace, and industrial maintenance.
What are the specifications of the OSG Screw Thread Insert STI Tap?
The OSG Screw Thread Insert STI Tap has a spiral flute design, size 7/8"-9 UNC, with H5 tolerance for 2B-3B thread classes. It features 4 flutes and is made for multiple materials. The manufacturer part number is 31503708.
Where to buy the OSG Screw Thread Insert STI Tap worldwide?
You can source the OSG Screw Thread Insert STI Tap through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring reliable supply for your operations.
How to select the correct OSG STI tap for thread inserts?
To select the correct OSG STI tap, match the tap size and thread pitch to the insert specifications. For a 7/8"-9 UNC insert, use the OSG spiral flute tap with H5 tolerance. Ensure the tap material suits your workpiece, and consult OSG's technical data for optimal performance.
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Common applications for OSGOSG Products
3G Electric supplies OSG spiral-flute sti taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















