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3G Electric
HELI-COIL Screw-Locking Tanged Helical Insert, 5/16"-18, Plain, 500 PK - Screw-Locking Tanged Helical Inserts
HELI-COILScrew-Locking Tanged Helical Inserts

HELI-COIL Screw-Locking Tanged Helical Insert, 5/16"-18, Plain, 500 PK

The HELI-COIL Helical Insert (SKU 3G-OTH-528840) is a tanged tang style, screw-locking insert with a 5/16"-18 coarse thread, plain finish, and 18-8 material grade. It offers a tensile strength of 200,000 to 250,000…

SKU 3G-OTH-528840

Also listed as: 35855CN312S · 3585 5CN312S

Brand
HELI-COIL
Item
Screw-Locking Tanged Helical Insert, 5/16"-18, Plain, 500 PK
Part Number
3585-5CN312S
Category
Screw-Locking Tanged Helical Inserts
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

HELI-COIL
Manufacturer Part Number
3585-5CN312S
Type
Screw-Locking, Plain, 500 PK
Tensile Strength
200,000 to 250,000 psi
Finish Type
Plain
Thread Size
5/16"-18
Thread Type
Coarse
STI Tap Size
5/16"-18
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 (SKU 3G-OTH-528840) is a tanged tang style, screw-locking insert with a 5/16"-18 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 500-piece pack.

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 5/16"-18 coarse thread provides strong, wear-resistant threads in aluminum, cast iron, and steel assemblies. 3G Electric supplies this genuine HELI-COIL insert for industrial maintenance and production applications worldwide.

What are the specifications of the HELI-COIL 3585-5CN312S insert?

This HELI-COIL insert has a 5/16"-18 coarse thread, 18-8 material grade, plain finish, and tensile strength of 200,000 to 250,000 psi. It is right-hand threaded, compatible with metal, and requires an STI tap size of 5/16"-18. The pack contains 500 pieces.

Where to buy HELI-COIL helical inserts in worldwide?

3G Electric supplies genuine HELI-COIL helical inserts worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this 5/16"-18 screw-locking insert to your facility. Contact us for availability and lead time on this 500-piece pack.

How to install a HELI-COIL tanged tang insert?

To install a HELI-COIL tanged tang insert, drill to the specified size, tap with the correct STI tap (5/16"-18 for this insert), then use a HELI-COIL installation tool to wind the insert into the tapped hole. After installation, break off the tang with a punch. 3G Electric can provide sourcing support for installation tools.

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 tanged 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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