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3G Electric
HELI-COIL Free-Running Tangless Helical Insert, 1/4"-20, Plain, 100 PK - Free-Running Tangless Helical Inserts
HELI-COILFree-Running Tangless Helical Inserts

HELI-COIL Free-Running Tangless Helical Insert, 1/4"-20, Plain, 100 PK

The HELI-COIL Helical Insert (Tangless Tang Style) is a free-running, plain finish insert with a 1/4"-20 coarse thread, right-hand direction, and an STI tap size of 1/4"-20. Made from 18-8 material grade, it offers a…

SKU 3G-OTH-527329

Also listed as: AT11854C500 · AT1185 4C500

Brand
HELI-COIL
Item
Free-Running Tangless Helical Insert, 1/4"-20, Plain, 100 PK
Part Number
AT1185-4C500
Category
Free-Running 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
AT1185-4C500
Type
Free-Running, Plain, 100 PK
Tensile Strength
200,000 to 250,000 psi
Finish Type
Plain
Thread Size
1/4"-20
Thread Type
Coarse
STI Tap Size
1/4"-20
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 (Tangless Tang Style) is a free-running, plain finish insert with a 1/4"-20 coarse thread, right-hand direction, and an STI tap size of 1/4"-20. Made from 18-8 material grade, it offers a tensile strength of 200,000 to 250,000 psi and is compatible with metal. Supplied in a 100-pack, this inch-system insert is designed for thread repair or reinforcement in industrial applications.

Frequently Asked Questions

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

A HELI-COIL Tangless helical insert is used for thread repair or reinforcement in metal components. It restores damaged internal threads or strengthens new threads in industrial applications like machining, automotive, and heavy equipment, providing a durable, free-running thread with high tensile strength.

What are the specifications of the HELI-COIL AT1185-4C500 insert?

The HELI-COIL AT1185-4C500 is a free-running, plain finish insert with a 1/4\"-20 coarse thread, right-hand direction, and STI tap size of 1/4\"-20. Made from 18-8 material, it offers tensile strength of 200,000 to 250,000 psi and comes in a 100-pack for inch-system metal applications.

Where to buy HELI-COIL helical inserts in worldwide?

3G Electric supplies HELI-COIL helical inserts worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner, we provide genuine HELI-COIL inserts like the AT1185-4C500 for thread repair needs across industries, ensuring reliable procurement from order to delivery.

How to install a HELI-COIL Tangless helical insert?

To install a HELI-COIL Tangless helical insert, drill and tap the hole to the specified STI tap size (1/4\"-20 for this insert), then use a tangless installation tool to wind the insert into the threaded hole. The tangless design eliminates the need for tang break-off, simplifying installation in metal components.

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 free-running 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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