We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
HELI-COIL 4937-125 Free-Running Helical Insert Assortment - Helical Insert Assortments
HELI-COILHelical Insert Assortments

HELI-COIL 4937-125 Free-Running Helical Insert Assortment

The HELI-COIL Thread Repair Kit (MPN 4937-125) is a tanged tang style, free-running helical insert assortment containing 4 inserts and 60 pieces across 3 sizes. It features an M8-1.25 STI tap size, coarse right-hand…

SKU 3G-OTH-526543

Also listed as: 4937125 · 4937 125

Brand
HELI-COIL
Item
4937-125 Free-Running Helical Insert Assortment
Part Number
4937-125
Category
Helical Insert Assortments
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

HELI-COIL
Manufacturer Part Number
4937-125
Type
Free-Running, 3 # of Sizes
Pieces
60
Inserts
4
Finish Type
Plain
Thread Type
Coarse
STI Tap Size
M8-1.25
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
Insert Types Included
Helical Inserts
System of Measurement
Metric

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The HELI-COIL Thread Repair Kit (MPN 4937-125) is a tanged tang style, free-running helical insert assortment containing 4 inserts and 60 pieces across 3 sizes. It features an M8-1.25 STI tap size, coarse right-hand threads, and 18-8 material grade, designed for metal compatibility in metric systems.

Frequently Asked Questions

What is the HELI-COIL Thread Repair Kit 4937-125 used for?

The HELI-COIL Thread Repair Kit 4937-125 is used to restore damaged internal threads in metal components. It includes 60 helical inserts across 3 sizes, an M8-1.25 STI tap, and is designed for free-running, coarse right-hand thread repairs in metric systems.

What are the specifications of the HELI-COIL Thread Repair Kit 4937-125?

The kit includes 4 inserts and 60 pieces total, with an M8-1.25 STI tap size, coarse right-hand threads, and 18-8 material grade. It is a tanged tang style, free-running helical insert assortment for metal compatibility in metric systems.

Where to buy the HELI-COIL Thread Repair Kit 4937-125 worldwide?

3G Electric supplies the HELI-COIL Thread Repair Kit 4937-125 worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this kit to your facility, ensuring you get the right thread repair solution for your application.

How to install the HELI-COIL Thread Repair Kit 4937-125?

To install, drill out the damaged thread to the specified size, tap the hole using the included M8-1.25 STI tap, then insert the helical insert using a tang-style installation tool. Ensure the insert is fully seated below the surface for a secure, free-running repair.

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
Not sure this is the right part? Photo-identify it

HELI-COIL Products

3G Electric supplies HELI-COIL helical insert assortments. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from HELI-COIL

View all HELI-COIL parts
HELI-COIL Thread Repair Kit: 6 Inserts, 54 Pieces, 3 # of Sizes, Tanged Tang Style, Free-Running (MPN 4934)
HELI-COIL
HELI-COIL Thread Repair Kit: 6 Inserts, 54 Pieces, 3 # of Sizes, Tanged Tang Style, Free-Running (MPN 4934)
This helical insert assortment includes 60 pieces across 3 sizes, featuring a tanged tang style and free-running design. The inserts are made from 18-8 stainless steel with a plain finish and have a fine right-hand thread (STI Tap Size 1/4"-28). Suitable for restoring damaged internal threads in metal components, commonly used in automotive, aerospace, and industrial maintenance applications
HELI-COIL
This helical insert assortment includes 60 pieces across 3 sizes, featuring a tanged tang style and free-running design. The inserts are made from 18-8 stainless steel with a plain finish and have a fine right-hand thread (STI Tap Size 1/4"-28). Suitable for restoring damaged internal threads in metal components, commonly used in automotive, aerospace, and industrial maintenance applications
This 6-pack assortment of free-running helical inserts is made from 18-8 stainless steel with a plain finish. Each insert features a fine M10-1.00 metric thread, right-hand direction, and a tensile strength of 200,000 to 250,000 psi. Designed for use with metal materials, these inserts are commonly used to repair or reinforce threads in applications such as automotive, aerospace, and industrial equipment
HELI-COIL
This 6-pack assortment of free-running helical inserts is made from 18-8 stainless steel with a plain finish. Each insert features a fine M10-1.00 metric thread, right-hand direction, and a tensile strength of 200,000 to 250,000 psi. Designed for use with metal materials, these inserts are commonly used to repair or reinforce threads in applications such as automotive, aerospace, and industrial equipment

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first