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HELI-COIL Screw-Locking Tangless Helical Insert - Screw-Locking Tangless Helical Inserts
HELI-COILScrew-Locking Tangless Helical Inserts

HELI-COIL Screw-Locking Tangless Helical Insert

The HELI-COIL Helical Insert is a screw-locking tangless helical insert with a #2-56 thread size, plain finish, and 18-8 material grade. It features a right-hand coarse thread, a tensile strength of 200,000 to…

SKU 3G-OTH-532457

Also listed as: AT358502C172 · AT3585 02C172

Brand
HELI-COIL
Item
Screw-Locking Tangless Helical Insert
Part Number
AT3585-02C172
Category
Screw-Locking Tangless Helical Inserts
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
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Technical Specifications

HELI-COIL
Manufacturer Part Number
AT3585-02C172
Type
Screw-Locking, #2-56 Thread Size, Plain, 100 PK
Tensile Strength
200,000 to 250,000 psi
Finish Type
Plain
Thread Type
Coarse
STI Tap Size
#2-56
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
System of Measurement
Inch

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HELI-COIL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HELI-COIL Helical Insert is a screw-locking tangless helical insert with a #2-56 thread size, plain finish, and 18-8 material grade. It features a right-hand coarse thread, a tensile strength of 200,000 to 250,000 psi, and is compatible with metal. Supplied in a 100-pack, this inch-system insert uses STI Tap Size #2-56.

Frequently Asked Questions

What is a HELI-COIL tangless helical insert used for?

A HELI-COIL tangless helical insert repairs or reinforces threads in metal. The screw-locking design resists vibration loosening, and the tangless feature eliminates the need for a break-off tang removal step. It is commonly used in aerospace, automotive, and industrial maintenance applications.

What are the specifications of the HELI-COIL AT3585-02C172 insert?

This HELI-COIL insert has a #2-56 thread size, coarse thread, right-hand direction, and plain finish. It is made from 18-8 stainless steel with a tensile strength of 200,000 to 250,000 psi. It uses STI Tap Size #2-56 and comes in a 100-pack for inch-system metal applications.

Where to buy HELI-COIL helical inserts worldwide?

3G Electric supplies HELI-COIL helical inserts worldwide. As a global industrial sourcing partner, we handle logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on the AT3585-02C172 or other HELI-COIL thread repair inserts.

How to install a tangless screw-locking helical insert?

To install a HELI-COIL tangless insert, drill the hole to the specified size, tap it using the correct STI tap (#2-56 for this insert), then use a tangless installation tool to wind the insert into the tapped hole. The screw-locking feature holds the insert in place without additional adhesives.

Used in

Common applications for HELI-COIL
Aerospace — Tangless screw-locking HELI-COIL inserts in 18-8 stainless steel for vibration-resistant threaded joints in airframe and engine components.
Automotive — Free-running tanged HELI-COIL inserts in metric sizes for repairing stripped threads in aluminum engine blocks and transmission housings.
Industrial machinery — STI taps and prewinder installation tools for on-site repair of threaded holes in cast iron and steel machine frames.
Oil and gas — Nitronic 60 HELI-COIL inserts for galling resistance in stainless steel valve bodies and pump housings exposed to corrosive media.
MRO and maintenance — HELI-COIL thread repair kits containing inserts, drill, tap, and installation tool for restoring damaged threads without replacing the parent component.
Electrical equipment — Screw-locking tangless HELI-COIL inserts for securing fasteners in metal enclosures and control panels subject to vibration.
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HELI-COIL Products

3G Electric supplies HELI-COIL screw-locking tangless helical inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Screw-locking tangless helical insert for repairing or reinforcing threads in metal. Made from 18-8 stainless steel with dry film lubricant finish, fine right-hand thread, and tensile strength of 200,000 to 250,000 psi. Requires STI tap size #10-32. Pack of 100

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