HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 1/4"-20 Thread Size, Plain
The HELI-COIL Helical Insert is a tanged tang style, screw-locking insert in a plain finish, supplied in a 100-piece pack. It features a 1/4"-20 coarse thread size, right-hand thread direction, and is made from 18-8…
SKU 3G-OTH-528969
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Product Description
The HELI-COIL Helical Insert is a tanged tang style, screw-locking insert in a plain finish, supplied in a 100-piece pack. It features a 1/4"-20 coarse thread size, right-hand thread direction, and is made from 18-8 material grade/class with a tensile strength of 200,000 to 250,000 psi. This inch-system insert is compatible with metal and uses an STI tap size of 1/4"-20 (MPN A3585-4CN375).
Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.
Frequently Asked Questions
What is a HELI-COIL helical insert used for?
A HELI-COIL helical insert repairs or reinforces threads in metal. This screw-locking, tanged tang style insert with 1/4"-20 coarse thread provides strong, wear-resistant threads in aluminum, cast iron, or steel, preventing thread stripping under high loads.
What are the specifications of the HELI-COIL A3585-4CN375 insert?
This HELI-COIL insert has a 1/4"-20 thread size, coarse thread type, right-hand direction, and 18-8 material grade with tensile strength of 200,000 to 250,000 psi. It uses an STI tap size of 1/4"-20, is plain finish, and comes in a 100-piece pack.
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 this 1/4"-20 screw-locking insert to your facility, ensuring you get the right thread repair solution for metal components.
How to install a HELI-COIL tanged helical insert?
Drill out the damaged thread to the specified STI tap size (1/4"-20 for this insert), tap the hole with an STI tap, then use a HELI-COIL installation tool to wind the insert into the hole. Break off the tang after installation. Always follow the manufacturer's instructions for best results.
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Common applications for HELI-COILHELI-COIL Products
3G Electric supplies HELI-COIL screw-locking tanged helical inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.









