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HELI-COIL 5403-18 M18-2.50 Free-Running Thread Repair Kit - Insert & Tool Kits
HELI-COILInsert & Tool Kits

HELI-COIL 5403-18 M18-2.50 Free-Running Thread Repair Kit

<p>The HELI-COIL 5403-18 is a professional thread repair kit designed for M18-2.50 coarse threads. This free-running kit includes helical inserts made from 18-8 stainless steel, providing durable, corrosion-resistant…

SKU 3G-OTH-528108

Also listed as: 540318 · 5403 18

Brand
HELI-COIL
Item
5403-18 M18-2.50 Free-Running Thread Repair Kit
Part Number
5403-18
Category
Insert & Tool Kits
Available to Order
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

HELI-COIL
Manufacturer Part Number
5403-18
Type
Free-Running, M18-2.50 Thread Size
Overall Lg
27 mm
Finish Type
Plain
Thread Type
Coarse
STI Tap Size
M18-2.50
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
Insert Types Included
Helical Inserts
System of Measurement
Metric

Technical Documents

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

Product Description

<p>The HELI-COIL 5403-18 is a professional thread repair kit designed for M18-2.50 coarse threads. This free-running kit includes helical inserts made from 18-8 stainless steel, providing durable, corrosion-resistant repairs in metal components. The kit is suitable for right-hand threads and includes the necessary STI tap (M18-2.50) for precise installation.</p><p>Ideal for maintenance teams and manufacturers, this kit restores damaged threads quickly and reliably. As a Singapore-based supplier, 3G Electric offers SGD quotes on request, handles GST for local buyers, and ensures fast delivery across Singapore and Southeast Asia.</p>

Frequently Asked Questions

What thread size and type does this kit repair?

This kit repairs M18-2.50 coarse, right-hand threads. It is a free-running type, suitable for applications where the screw needs to turn freely.

What material are the inserts made of?

The inserts are made from 18-8 stainless steel, which offers good corrosion resistance and strength for metal repairs.

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
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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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This kit includes 18-8 stainless steel helical inserts and a 1/4"-28 STI tap for creating free-running, fine right-hand threads in metal components. The tanged tang style inserts are used to repair stripped or worn internal threads. Suitable for general metal repair applications where inch-system threads are required
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This kit includes 18-8 stainless steel helical inserts and a 1/4"-28 STI tap for creating free-running, fine right-hand threads in metal components. The tanged tang style inserts are used to repair stripped or worn internal threads. Suitable for general metal repair applications where inch-system threads are required
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This thread repair kit includes helical inserts made of 18-8 stainless steel with a plain finish, designed for restoring damaged internal threads in metal components. It is a tanged tang style, free-running kit for #4-40 coarse threads, right-hand thread direction, and includes an STI tap of the same size. Suitable for use in machinery, automotive, and industrial equipment where inch-system threads are required
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This thread repair kit includes helical inserts made of 18-8 stainless steel with a plain finish, designed for restoring damaged internal threads in metal components. It is a tanged tang style, free-running kit for #4-40 coarse threads, right-hand thread direction, and includes an STI tap of the same size. Suitable for use in machinery, automotive, and industrial equipment where inch-system threads are required

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