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HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-28 Thread Size - Free-Running Tanged Helical Inserts
HELI-COILFree-Running Tanged Helical Inserts

HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-28 Thread Size

The HELI-COIL Helical Insert is a free-running tanged tang style insert with a 1/4"-28 thread size, right-hand orientation, and fine thread pitch. Made from 18-8 metal with a dry film lubricant, it offers a tensile…

SKU 3G-OTH-599199

Also listed as: A11914CNW375 · A1191 4CNW375

Brand
HELI-COIL
Item
Helical Insert: Tanged Tang Style, Free-Running, 1/4"-28 Thread Size
Category
Free-Running Tanged Helical Inserts
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Technical Specifications

HELI-COIL
Manufacturer Part Number
A1191-4CNW375
Type
Free-Running, 100 PK
Thread Size
1/4"-28

Technical Documents

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

Product Description

The HELI-COIL Helical Insert is a free-running tanged tang style insert with a 1/4"-28 thread size, right-hand orientation, and fine thread pitch. Made from 18-8 metal with a dry film lubricant, it offers a tensile strength range of 200,000 to 250,000 psi. Supplied in a 100-piece pack (MPN A1191-4CNW375), this inch-series insert is designed for thread repair or reinforcement in metal applications.

Frequently Asked Questions

What is a HELI-COIL helical insert used for?

A HELI-COIL helical insert is used to repair or reinforce internal threads in metal applications. This free-running tanged tang style insert, with a 1/4"-28 fine thread, restores damaged threads or strengthens new ones, providing a durable stainless steel thread surface.

What are the specifications of the HELI-COIL A1191-4CNW375?

The HELI-COIL A1191-4CNW375 is a free-running tanged helical insert with a 1/4"-28 thread size, right-hand orientation, and fine pitch. Made from 18-8 stainless steel with dry film lubricant, it offers tensile strength of 200,000 to 250,000 psi. Supplied in a 100-piece pack.

Where to buy HELI-COIL helical inserts worldwide?

3G Electric supplies HELI-COIL helical inserts worldwide, handling full logistics and customs clearance. As a global industrial solutions provider, we source and deliver genuine HELI-COIL products like the A1191-4CNW375 to any location, ensuring compliance and timely delivery.

How to install a HELI-COIL tanged helical insert?

To install a HELI-COIL tanged helical insert, drill out the damaged thread to the specified tap drill size, tap the hole with the correct HELI-COIL tap, then use the installation tool to wind the insert into the threaded hole. Break off the tang after installation for a permanent thread.

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 free-running 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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