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HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #4-40 Thread Size, Plain - Free-Running Tangless Helical Inserts
HELI-COILFree-Running Tangless Helical Inserts

HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #4-40 Thread Size, Plain

The HELI-COIL Helical Insert is a free-running, tangless insert with a #4-40 thread size, plain finish, and right-hand coarse threads. Made from 18-8 material with a tensile strength of 200,000 to 250,000 psi, it is…

SKU 3G-OTH-527316

Brand
HELI-COIL
Item
Helical Insert: Tangless Tang Style, Free-Running, #4-40 Thread Size, Plain
Category
Free-Running Tangless Helical Inserts
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Technical Specifications

HELI-COIL
Manufacturer Part Number
AT1185-04C224
Type
Free-Running, #4-40 Thread Size, Plain, Plain, 100 PK
Tensile Strength
200,000 to 250,000 psi
Finish Type
Plain
Thread Type
Coarse
STI Tap Size
#4-40
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 free-running, tangless insert with a #4-40 thread size, plain finish, and right-hand coarse threads. Made from 18-8 material with a tensile strength of 200,000 to 250,000 psi, it is compatible with metal and comes in a 100-piece pack (MPN AT1185-04C224).

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, providing a durable free-running coarse thread. It is ideal for aerospace, automotive, and industrial applications where thread strength and reliability are critical.

What are the specifications of the HELI-COIL AT1185-04C224 insert?

This HELI-COIL insert has a #4-40 thread size, right-hand coarse threads, and a plain finish. It is made from 18-8 material with a tensile strength of 200,000 to 250,000 psi. The tangless design eliminates the need for tab removal, and it comes 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 parts like the AT1185-04C224 to support your thread repair needs.

How to install a tangless helical insert?

To install a tangless helical insert, drill and tap the hole to the specified STI tap size (#4-40 for this insert). Use a tangless installation tool to wind the insert into the tapped hole until it sits slightly below the surface. No tang removal is needed.

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 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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HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #8-32 Thread Size, Plain, Plain, 100 PK (MPN AT1185-2C328). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: #8-32; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #2-56 Thread Size, Plain, 1,000 PK (MPN T1185-02C086S). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: #2-56; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Drill Bit Size: 3/32; Tensile Strength: 200,000 to 250,000 psi.
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HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #2-56 Thread Size, Plain, 1,000 PK (MPN T1185-02C086S). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: #2-56; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Drill Bit Size: 3/32; Tensile Strength: 200,000 to 250,000 psi.
HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, #10-24 Thread Size, Plain, 100 PK (MPN AT1185-3C380). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: #10-24; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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HELI-COIL Helical Insert: Tangless Tang Style, Free-Running, 1/4"-20 Thread Size, Plain, 1,000 PK (MPN T1185-4C250S). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: 1/4"-20; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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