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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-16 Thread Size - Insert & Tool Kits
HELI-COILInsert & Tool Kits

HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-16 Thread Size

The HELI-COIL Thread Repair Kit (MPN 5401-6) is a tanged tang style kit for free-running, stainless steel helical inserts. It includes a 3/8"-16 STI tap and inserts with an 18-8 material grade, right-hand coarse…

SKU 3G-OTH-527869

Brand
HELI-COIL
Item
Thread Repair Kit: Tanged Tang Style, Free-Running, 3/8"-16 Thread Size
Category
Insert & Tool Kits
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Technical Specifications

HELI-COIL
Manufacturer Part Number
5401-6
Type
Free-Running, Stainless Steel
Finish Type
Plain
Thread Size
3/8"-16
Thread Type
Coarse
STI Tap Size
3/8"-16
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 5401-6) is a tanged tang style kit for free-running, stainless steel helical inserts. It includes a 3/8"-16 STI tap and inserts with an 18-8 material grade, right-hand coarse thread, and plain finish, designed for metal substrates in inch-system applications.

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, free-running threads. Common applications include automotive, industrial machinery, and equipment maintenance where original threads have stripped or corroded.

What are the specifications of the HELI-COIL 5401-6 kit?

The HELI-COIL 5401-6 kit includes a 3/8"-16 STI tap and tanged tang style helical inserts. Inserts are 18-8 stainless steel, free-running, with right-hand coarse thread and plain finish. The kit is designed for inch-system metal substrates and is compatible with 3/8"-16 coarse threads.

Where to buy a HELI-COIL Thread Repair Kit worldwide?

3G Electric supplies the HELI-COIL 5401-6 Thread Repair Kit worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us to order this kit or any HELI-COIL product for your maintenance needs.

How to install a HELI-COIL thread insert?

To install a HELI-COIL insert, drill out the damaged thread to the specified size, tap the hole using the included STI tap, then wind the insert into the tapped hole using the tang. Break off the tang after installation. Always follow the manufacturer's instructions for proper thread depth and torque.

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, #4-40 Thread Size, Stainless Steel (MPN 5401-04). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #4-40; 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, 7/16"-14 Thread Size, Stainless Steel (MPN 5401-7). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 7/16"-14; 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, #8-36 Thread Size, Stainless Steel (MPN 5402-2). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #8-36; 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, #8-36 Thread Size, Stainless Steel (MPN 5402-2). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #8-36; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: Fine.
HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 1/8"-27 Thread Size, Stainless Steel (MPN 5407-2). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 1/8"-27; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: NPT.
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HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, 1/8"-27 Thread Size, Stainless Steel (MPN 5407-2). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 1/8"-27; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Thread Type: NPT.
HELI-COIL Thread Repair Kit: Tanged Tang Style, Free-Running, #6-40 Thread Size, Stainless Steel (MPN 5402-06). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: #6-40; 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, 3/4"-10 Thread Size, Stainless Steel (MPN 5401-12). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: 3/4"-10; 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, M20-2.50 Thread Size, 30 mm Overall Lg (MPN 5403-20). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; Insert Types Included: Helical Inserts; STI Tap Size: M20-2.50; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Thread Type: Coarse.
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