OSG Screw Thread Insert STI Tap: Spiral Point, 1/2"-20 UNF, H4 / 2B-3B, 3 Flute
The OSG Screw Thread Insert STI Tap is a spiral-point tap designed for threading nickel and titanium. This 1/2"-20 UNF tap features an H4 / 2B-3B tolerance with a plug chamfer and 3 flutes (MPN 31421008).
SKU 3G-OTH-279740
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 threading nickel and titanium. This 1/2"-20 UNF tap features an H4 / 2B-3B tolerance with a plug chamfer and 3 flutes (MPN 31421008).
Frequently Asked Questions
What is the OSG Screw Thread Insert STI Tap used for?
This OSG spiral-point STI tap is designed for cutting internal threads in nickel and titanium alloys before installing screw thread inserts. It is commonly used in aerospace, automotive, and heavy-equipment manufacturing where high-strength, corrosion-resistant threaded holes are required in difficult-to-machine materials.
What are the specifications of the OSG 31421008 STI tap?
The OSG 31421008 is a spiral-point STI tap with a 1/2"-20 UNF thread, H4 / 2B-3B tolerance, 3 flutes, and a plug chamfer. It is designed specifically for threading nickel and titanium alloys prior to insert installation. The H4 pitch diameter tolerance ensures proper fit for 2B-3B class threads.
Where to buy OSG STI taps in worldwide?
3G Electric supplies OSG STI taps worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on the OSG 31421008 or other OSG threading tools. We source and deliver to any country.
How to select the correct STI tap for nickel alloys?
For nickel alloys, choose a spiral-point STI tap like this OSG model with H4 tolerance to accommodate the insert's pitch diameter. Use a plug chamfer for through holes and ensure the tap is rated for nickel/titanium. Always match the tap to the insert's thread size and class (e.g., 1/2"-20 UNF, 2B-3B).
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3G Electric supplies OSG spiral-point sti taps for nickel & titanium. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
