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HELI-COIL AT3585-4C500 Screw-Locking Tangless Helical Insert - Screw-Locking Tangless Helical Inserts
HELI-COILScrew-Locking Tangless Helical Inserts

HELI-COIL AT3585-4C500 Screw-Locking Tangless Helical Insert

The HELI-COIL Helical Insert is a Tangless Tang Style screw-locking insert with a 1/4"-20 coarse thread, plain finish, and 18-8 material grade. It offers a tensile strength of 200,000 to 250,000 psi, is compatible…

SKU 3G-OTH-532451

Also listed as: AT35854C500 · AT3585 4C500

Brand
HELI-COIL
Item
AT3585-4C500 Screw-Locking Tangless Helical Insert
Category
Screw-Locking Tangless Helical Inserts
Available to Order
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

HELI-COIL
Manufacturer Part Number
AT3585-4C500
Type
Screw-Locking, 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

Technical Documents

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

Product Description

The HELI-COIL Helical Insert is a Tangless Tang Style screw-locking insert with a 1/4"-20 coarse thread, plain finish, and 18-8 material grade. It offers a tensile strength of 200,000 to 250,000 psi, is compatible with metal, and comes in a 100-pack. 3G Electric interprets demand and sources this insert across 14 industrial departments, with specialist depth in combustion, pumps, and controls as an authorised distributor.

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 style eliminates the need for a break-off tang. It is commonly used in automotive, aerospace, and industrial maintenance applications.

What are the specifications of the HELI-COIL AT3585-4C500 insert?

The HELI-COIL AT3585-4C500 is a 1/4"-20 coarse thread, screw-locking, tangless helical insert. It has a tensile strength of 200,000 to 250,000 psi, is made from 18-8 stainless steel, and comes in a 100-pack with a plain finish. The STI tap size is 1/4"-20.

Where to buy HELI-COIL helical inserts worldwide?

3G Electric supplies HELI-COIL helical inserts worldwide. We interpret your demand, source the correct part, and handle logistics and customs for delivery globally. Contact us for availability and lead time on the AT3585-4C500 or other HELI-COIL inserts.

How to install a tangless helical insert?

To install a tangless helical insert, drill and tap the hole to the STI tap size (1/4"-20 for this insert). Use a tangless installation tool to wind the insert into the threaded hole until it sits slightly below the surface. No tang removal is needed, simplifying installation.

Used in

Common applications for HELI-COIL
Aerospace engine repair — HELI-COIL STI taps for M12x1.75 metric threads in aluminum alloy components
Automotive transmission rebuild — HELI-COIL STI taps for 7/16-14 UNC threads in cast iron housings
Industrial pump maintenance — HELI-COIL STI taps for #10-32 UNF threads in stainless steel pump bodies
Hydraulic cylinder repair — HELI-COIL STI taps for M6x1 metric threads in steel cylinder heads
General manufacturing — HELI-COIL STI taps for 9/16-18 UNF threads in machinery base plates

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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