HELI-COIL Free-Running Tangless Helical Insert, 1/4"-28, Plain, 100 PK
The HELI-COIL Helical Insert (Tangless Tang Style) is a free-running, plain finish insert in a 100-piece pack, designed for 1/4"-28 fine threads in metal. Made from 18-8 material with a tensile strength of 200,000 to…
SKU 3G-OTH-527350
Also listed as: AT11914C500 · AT1191 4C500
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 HELI-COIL Helical Insert (Tangless Tang Style) is a free-running, plain finish insert in a 100-piece pack, designed for 1/4"-28 fine threads in metal. Made from 18-8 material with a tensile strength of 200,000 to 250,000 psi, it uses a right-hand thread direction and requires an STI tap size of 1/4"-28. This inch-system insert is compatible with metal substrates and is manufactured under part number AT1191-4C500.
Frequently Asked Questions
What is a HELI-COIL Tangless helical insert used for?
A HELI-COIL Tangless helical insert repairs or reinforces internal threads in metal. The tangless design eliminates the need to break off a tang after installation, saving time. It is ideal for restoring stripped threads in automotive, aerospace, and industrial equipment, providing strong, wear-resistant threads in aluminum or steel.
What are the specifications of the HELI-COIL AT1191-4C500 insert?
The HELI-COIL AT1191-4C500 is a free-running, plain finish insert in a 100-piece pack. It has a 1/4\"-28 fine thread size, right-hand thread direction, and requires an STI tap size of 1/4\"-28. Made from 18-8 material, it offers a tensile strength of 200,000 to 250,000 psi and is compatible with metal substrates.
Where to buy HELI-COIL helical inserts worldwide?
3G Electric supplies HELI-COIL helical inserts worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver the AT1191-4C500 and other HELI-COIL products to your facility. Contact us for a quote and lead time on this 100-piece pack of tangless inserts.
How to install a HELI-COIL Tangless insert?
To install a HELI-COIL Tangless insert, drill out the damaged thread to the specified size, then tap the hole using the correct STI tap (1/4\"-28 for this insert). Use a tangless installation tool to wind the insert into the tapped hole until it sits slightly below the surface. No tang removal is needed.
Used in
Common applications for HELI-COILHELI-COIL Products
3G Electric supplies HELI-COIL free-running tangless helical inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
