OSG Screw Thread Insert STI Tap: Straight Fute, 7/16"-20 UNF, H3 / 2B-3B, 4 Flute
The OSG Screw Thread Insert STI Tap (Straight Flute) is a general-purpose STI tap for 7/16"-20 UNF threads, with an H3 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer (MPN 1813500). 3G Electric interprets demand…
SKU 3G-OTH-262064
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Product Description
The OSG Screw Thread Insert STI Tap (Straight Flute) is a general-purpose STI tap for 7/16"-20 UNF threads, with an H3 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer (MPN 1813500). 3G Electric interprets demand and sources this genuine OSG tool 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 STI tap cuts internal threads in a pre-drilled hole to accept a screw thread insert (Heli-Coil type). It is used in manufacturing and repair applications across industries like automotive and aerospace where stripped threads need reinforcement or where stronger threads are required in softer materials.
What are the specifications of the OSG 1813500 STI Tap?
The OSG 1813500 is a 7/16"-20 UNF straight flute STI tap with a H3 / 2B-3B tolerance class. It has 4 flutes and a bottoming chamfer, designed for threading blind holes. This general-purpose tap is made for use with screw thread inserts and is suitable for ferrous and non-ferrous materials.
Where to buy OSG taps in worldwide?
3G Electric supplies OSG taps worldwide, including the 1813500 STI tap. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this and other OSG cutting tools.
How to select the correct STI tap size for a thread insert?
Select an STI tap that matches the thread size and pitch of the insert (e.g., 7/16"-20 UNF). Use a bottoming chamfer tap for blind holes and a plug chamfer for through holes. The tap tolerance (H3 / 2B-3B) ensures the internal thread fits the insert correctly. Always drill the recommended tap drill size for STI taps.
Used in
Common applications for OSGOSG Products
3G Electric supplies OSG general purpose sti taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
