OSG Screw Thread Insert STI Tap: Spiral Fute, 7/16"-20 UNF, H4 / 2B-3B, 3 Flute
The OSG Screw Thread Insert STI Tap (SKU 33ZF57, MPN 8017500) is a spiral-flute tap for 7/16"-20 UNF threads, featuring a bottoming chamfer and three flutes. It is ground to H4 tolerance for 2B-3B class fit, enabling…
SKU 3G-OTH-273390
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Product Description
The OSG Screw Thread Insert STI Tap (SKU 33ZF57, MPN 8017500) is a spiral-flute tap for 7/16"-20 UNF threads, featuring a bottoming chamfer and three flutes. It is ground to H4 tolerance for 2B-3B class fit, enabling consistent thread forming in industrial applications.
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 that accept inserts for repair or reinforcement in metals and plastics.
What are the specifications of the OSG 8017500 STI tap?
The OSG 8017500 is a spiral-flute STI tap with a 7/16"-20 UNF thread size, H4 / 2B-3B tolerance, 3 flutes, and a bottoming chamfer. It is designed for thread sizes requiring a screw thread insert and is made by OSG.
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 location. Contact us for availability and lead time on the OSG 8017500.
How to select the correct STI tap for a thread insert?
Select an STI tap that matches the insert's thread size and pitch, such as the OSG 8017500 for 7/16"-20 UNF. Use a bottoming chamfer for blind holes and a spiral-flute design for chip evacuation. Verify the tap tolerance (H4 / 2B-3B) matches your required thread class.
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.
