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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-18 Thread Size - Insert & Tool Kits
HELI-COILInsert & Tool Kits

HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-18 Thread Size

The HELI-COIL Thread Repair Kit (MPN 5407-6) is a tanged tang style insert and tool kit for repairing damaged threads in metal. It includes free-running, 18-8 stainless steel helical inserts with a 3/8"-18 NPT…

SKU 3G-OTH-528069

Brand
HELI-COIL
Item
Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-18 Thread Size
Category
Insert & Tool Kits
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Technical Specifications

HELI-COIL
Manufacturer Part Number
5407-6
Type
Free-Running, Stainless Steel
Finish Type
Plain
Thread Size
3/8"-18
Thread Type
NPT
STI Tap Size
3/8"-18
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
Insert Types Included
Helical Inserts
System of Measurement
Inch
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HELI-COIL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HELI-COIL Thread Repair Kit (MPN 5407-6) is a tanged tang style insert and tool kit for repairing damaged threads in metal. It includes free-running, 18-8 stainless steel helical inserts with a 3/8"-18 NPT right-hand thread size and an STI tap of the same size.

Frequently Asked Questions

What is a HELI-COIL thread repair kit used for?

A HELI-COIL thread repair kit restores damaged internal threads in metal components. It uses 18-8 stainless steel helical inserts to create strong, wear-resistant threads, extending the life of parts in automotive, industrial, and maintenance applications.

What are the specifications of the HELI-COIL 5407-6 thread repair kit?

The HELI-COIL 5407-6 kit includes free-running, tanged tang style helical inserts with a 3/8"-18 NPT right-hand thread size. It is made of 18-8 stainless steel, compatible with metal, and includes an STI tap of the same size. System of measurement is inch.

Where to buy HELI-COIL thread repair kits worldwide?

3G Electric supplies HELI-COIL thread repair kits worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver the 5407-6 kit and other thread repair products to your facility, wherever it is located.

How to install a HELI-COIL thread insert?

To install a HELI-COIL insert, drill out the damaged thread, tap the hole with the included STI tap, then use the tang-style installation tool to wind the insert into the new thread. Break off the tang after installation. Always follow the manufacturer's instructions for best results.

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 insert & tool kits. 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 Thread Repair Kit: Tanged Tang Style, Free-Running, 7/16"-20 Thread Size, Stainless Steel (MPN 5402-7). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 7/16"-20; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Fine.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, M6-1.00 Thread Size, Stainless Steel (MPN 5403-6). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M6-1.00; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, M12-1.75 Thread Size, Stainless Steel (MPN 5403-12). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M12-1.75; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, M12-1.75 Thread Size, Stainless Steel (MPN 5403-12). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M12-1.75; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, #5-40 Thread Size, Stainless Steel (MPN 5401-05). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #5-40; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, #5-40 Thread Size, Stainless Steel (MPN 5401-05). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #5-40; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Coarse.
HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, M8-1.25 Thread Size, Stainless Steel (MPN 5403-8). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M8-1.25; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 1/2"-13 Thread Size, Stainless Steel (MPN 5401-8). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 1/2"-13; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, M5-0.80 Thread Size, Stainless Steel (MPN 5403-5). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M5-0.80; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-16 Thread Size, Stainless Steel (MPN 5401-6). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 3/8"-16; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Coarse.
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