Best Inserts 2026

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Last Updated - 27.03.2026

Best Choice

01

Mintion

Mintion PRO Heat Set Insert Tool 90 W, Thread Insert Melting Thread Kit, 30 x M3 Thread Inserts, Soldering Tips, Melting Thread Insert Press Tool 210 mm Linear Guide for 3D Printing Parts Accessories

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13% Off
9.8

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Linear Guide & 210mm Height - The vertical Heat Set Insert Tool Pro with precise linear guide ensures smooth, accurate movements. The extended height of 210 mm provides space for larger 3D printed parts, complex designs or case parts.
FOR PROFESSIONALS & MAKERS - Essential for makers, engineers, model makers and 3D printing farms who demand the highest precision, efficiency and repeatability in DIY plastic parts, 3D printing components and repairs.
Complete professional accessory kit - With integrated storage drawer for a tidy workbench. Includes 30 M3 brass threaded inserts, 6 soldering tips (M2-M8), tweezers, wrenches, Allen keys - all for professional results.
Adjustable positioning system - Height adjustable bracket for secure fixing of various workpieces. Ideal for small series productions, repairs of plastic housings, model making or prototype manufacturing. Perfect for inserting threaded inserts into 3D printed parts, precise assembly of electronics housings, as well as for craft and DIY projects where stable and repeat accurate positioning is required.
90W Soldering Iron with Display - Fast heating and constant temperature (180-500°C) thanks to digital display. Perfect for precise melting of threaded insert, melting nuts and insert nuts in PLA, ABS or PETG.

69,99 € 79,99 €(13% Off off)
02

ruthex

ruthex M2/M3/M4/M5 Threaded Inserts, Assortment Box, 70/100/50/50 Pieces, Lead-Free Threaded Bushing Made of Brass, Insert Nut for Plastic Parts, By Melting Into 3D Printed Parts

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Suitable for various plastics: The inserts are designed for all thermoplastics. The knurled nuts hold, for example, in PLA, PETG, ABS, PPS, PP and many more. As soon as the plastic of the part around the brass sleeve cools and hardens, the threaded sleeve is firmly anchored.
Stable and durable thread inserts: The internal brass thread inserts ensure optimal corrosion resistance and thermal conductivity. This means that each insert nut can be used for a long time and is easy to use. The screw-in thread can also be reused by carefully removing it from the printed part if it is no longer needed.
Practical threaded insert box: The ruthex threaded inserts box is lead-free and consist of 70 x RX-M2x4, 100 x RX-M3x5.7, 50 x RX-M4x8.1 and 50 x RX-M5x9.5 insert nuts with M2, M3, M4 and M5 internal thread. The threaded inserts come in a practical assortment box. The threaded sleeves can be inserted through ultrasonic insertion and heat embedding.
M2 + M3 + M4 + M5 thread insert for your 3D printed parts. The ruthex threaded nuts can be inserted through heat or ultrasonic insertion in parts from 3D printers by, for example, Bambu or Prusa. Using a soldering iron or ultrasonic, the insertion nuts are simply embedded in a blind hole or through hole.
Firm hold and easy application: Thanks to the geometry of the threaded sleeve, it holds firmly in the printed part. The opposite spiral-shaped knurled nuts ensure a balanced high tightening and loosening torque, as well as a high tightening force. Thanks to the guide, insertion is much easier.

29,99 €
Value for Money

03

HOLMOL

Threaded Insert 360 Piece Set, HOLMOL Brass Melting Thread M2 M2.5 M3 M4 M5 M6 for Plastic, Knurled Insert Nuts for 3D Printing Accessories and DIY Projects, Thread Inserts with Box

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15% Off
9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile: threaded inserts are ideal for electronics, 3D printing, laptop shapes and many other DIY applications
Variety of sizes: including 50 pieces M2x2.5x3.2, 40 pieces M2x3x3.2, 40 pieces M2x4x3.2, 40 pieces M2.5x4x3.5, 40 pieces M2.5x5x3. 5, 30 pieces M3x4x5, 30 pieces M3x5x5, 30 pieces M3x6x5, 10 pieces M4x4x6, 10 pieces M4x6x6, 10 pieces M4x8x6, 10 pieces M5x6x7, 10 pieces M5x10x7, 5 pieces M6x8x8x 8, 5 pieces 1/4-20x12.7x8 knurled melting threads for 3D printing
Precise knurled thread: the knurled thread ensures a strong hold and prevents pulling out, especially when used in 3D printed parts
Highest quality: threaded insert is made of brass, which is known for its high corrosion resistance and thermal conductivity
Easy to use: press-in nuts can be easily inserted into plastic or 3D printed materials by heating

11,88 € 13,98 €(15% Off off)
04

TW1TGOFT

Pack of 300 Threaded Inserts, M2 M2.5 M3 M4 M5 M6 Insert Nut Brass Threaded Bushings Female Thread Knurled Nuts with Plastic Box for Plastic Parts by Heat or Ultrasonic in 3D Printer Parts

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9.4

Excellent

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Main highlights

Sturdy & Durable: Forged from pure copper, good thermal conductivity, fully automatic manufacturing process, deep thread, even slope, smooth and burr-free surface, acid and alkali resistant, strong oxidation resistance, durable.
EASY ASSEMBLY Insert the threaded nut into the hole and heat the nut with a soldering iron. After heating, the threaded insert is pressed into the part. The screws are then mounted with the cooled nut. The nut can be easily inserted into the plastic part with either the ultrasonic or soldering iron.
Attention: hot pressing process for nut inserts, please preheat the nut before the bottom pressing process. Workers should wear insulated gloves when operating to avoid safety risks during operation.
Application: TW1TGOFT knurled nuts are designed for thermoplastics. The threaded insert nuts are threaded connections for injection moulding, circuit board assembly, electronic products and most plastic fasteners, e.g. PLA, PP, ABS, PPS, PETG.
7 models and 15 sizes: (dimensions in mm) M2 x 2.5 x 3.2, M2 x 3 x 3.2, M2 x 4 x 3.2, M2.5 x 4 x 3.5, M2.5 x 5 x 3.5, M3 x 4 x 5, M3 x 5. 5 , M3 x 6 x 5, M4 x 4 x 6, M4 x 6 x 6, M4 x 8 x 6, M5 x 6 x 7, M5 x 10 x 7, M6 x 8 x 8, 1/4-20 x 12.7 x 8, total 300 pieces. It is in different compartments it is in a plastic box and is labelled to avoid confusion.

11,99 €
05

Bolatus

360 x Threaded Insert M2 M2.5 M3 M4 M5 M6, Bolatus Melting Nuts Brass with Soldering Iron Melting Aid, Knurled Melting Thread for Plastic Parts, Thread Inserts for 3D Printer Parts

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Wide application: the brass thread inserts are suitable for 3D printers, digital cameras, computers, plastic car parts, circuit board assembly, electronic products and most plastic firmware
Welding tool kit: welding rods with welding connectors (compatible with M2, M2.5, M3, M4, M5, M6, thread specifications) and adapters for quick replacement and effective adjustment to the melt
Strong and stable: Diagonal external thread design increases friction, ensures good stability and increases torque strength
Quality material: melting nuts and welding columns melting aid kit made of brass, with good thermal conductivity, not easy to deform. The surface is smooth and the thread is clear
Easy to use: Install the thermal head with threaded insert on the welding rod and then insert it into the threaded hole of the threaded plug to heat it. After heating, press the melting thread into the plastic part

14,99 €
06

Hapric

Pack of 200 Threaded Inserts, M3 Thread Insert, 3D Print, Melting Thread, Insertion Nuts, Threaded Inserts for 3D Printing Parts, Automotive, Plastic Shell

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9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Sufficient quantity: you will receive 200 pieces threaded inserts with specifications M3 x 4 x 5 mm, sufficient quantity to meet your daily use and replacement needs. Please confirm the required nut size before purchasing.
Strong and stable: the threaded insert is made of brass, which has good thermal conductivity and is not easy to deform. The surface is smooth and burr-free and the threads are clear. Diagonal threads ensure a snug fit and increase torque strength.
Multiple use: the press-in nuts are widely used in life and are suitable for 3D printers, digital cameras, computers, plastic car parts, circuit board assembly, electronic products and most plastic fasteners, etc.
Easy to use: simply heat the threaded insert 3D pressure and press into the plastic. It can also be installed with a soldering iron or an ultrasonic device.
Easy to carry: comes with a transparent plastic box. You can put the melting threads into the plastic box, which takes up little space, easy to store and easy to carry.

9,99 €
07

Gorffy

Gorffy 338 Piece Threaded Insert 3D Print, M2 M2.5 M3 M4 M5 M6 Melting Thread with Soldering Iron Melting Aid Set, Brass Insert Nuts, Knurled Melting Nuts, Threaded Inserts for 3D Printers

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9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Wide range of applications: specially designed for assembling 3D printer frames and plastic prototypes. These threaded inserts 3D printing are also compatible with automotive electronics, household appliances injection molding, plastic housings for laptops and DIY projects that require heavy duty threaded anchors.
Quick heat installation: the set contains a soldering iron adapter and special soldering iron tips that are compatible with different melting nuts. The melting threads seamlessly into pre-drilled holes and form dense, vibration-resistant threads that protect sensitive 3D printer layers.
Knurled thread design for non-slip hold: Precision knurling maximises surface friction and prevents twisting or loosening during heat insertion. The textured surface ensures a press-in nuts secure connection with 3D printer parts and plastic substrates.
High-quality brass material: made of durable, corrosion-resistant brass, these threaded insert 3D printing ensure superior thermal conductivity for faster melt installation and long-term stability in 3D printers, automotive parts and plastic housings.
338 melting threads: contains 330 pieces 3D print thread inserts (80 M2 x 2 x 3.2 mm, 80 M2.5 x 4 x 3.5 mm, 80 M3 x 4 x 5 mm, 50 M4 x 4 x 6 mm, 20 M5 x 10 x 7 mm, 20 M6 x 8×8 mm) and 8 pieces soldering iron melting aid set (M2/M2.5/M3/M4/M5/M6/M8 soldering iron tips with a M4 x 32 mm soldering iron adapter).

13,98 €
08

ruthex

ruthex M3 Threaded Insert, Pack of 100 RX-M3x5.7 Lead-Free Threaded Bushings Made of Brass, Sturdy Insert Nut for Plastic Parts, Heat Insertion in 3D Printed Plastic Parts

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9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Suitable for various plastics: The inserts are designed for all thermoplastic plastics. The knurled nuts hold, for example, in PLA, PETG, ABS, PPS, PP and many more. As soon as the plastic of the part around the brass sleeve cools and hardens, the internal threaded sleeve is firmly anchored.
Sturdy and durable screw-in thread: The internal thread inserts are made of premium-quality brass, which ensures optimal corrosion resistance and thermal conductivity. Thus, each insert nut can be used for a long term and is easy to insert. The screw-in thread can also be reused by carefully removing it from the printed part if it is no longer needed.
Practical thread insert set: The ruthex RX-M3x5.7 thread insert set consists of 100 insert nuts with M3 internal thread and a length of 5.7 mm. The threaded sleeves can be inserted through ultrasonic insertion and heat embedding.
M3 thread inserts for your 3D printed parts: The ruthex threaded nuts can be subsequently inserted in parts from 3D printers by, for example, Anycubic, Prusa. Using a soldering iron or ultrasonic, the insertion nuts are simply embedded in a blind hole or through hole.
Firm hold and easy application: Thanks to the geometry of the threaded sleeve, it holds firmly in the printed part. The opposite spiral-shaped knurled nuts ensure a balanced high tightening and loosening torque as well as a high tightening force. The guide makes insertion much easier.

8,99 €
09

HAOYULUO

Pack of 300 Threaded Inserts, Press-in Nuts with Label, M2, M2.5, M3, M4, M5, M6 Melting Thread, with Sorting Box, Threaded Inserts, for 3D Printing Accessories and Plastic Parts by Heat or Ultrasonic

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8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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1 piece

10,99 €
10

ruthex

ruthex 7x Soldering Tips/Melting Aid Set - Soldering Iron Tips for ruthex Thread Inserts M2 / M2.5 / M3 / M4 / M5 / M6 / M8 - #2-56/ #4-40/ #6-32/ #8-32/ #10-24/1/4 Inch with Soldering Iron Adapter

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Soldering tips for ruthex thread inserts - The ruthex soldering tips allow even easier the subsequent melting of thread inserts into 3D printing parts. This item LOE-SET-012 replaces the old version LOE-SET-011.
Practical thread insert set – the soldering iron tip set includes tips for thread inserts M2, M2.5, M3, M4, M5, M6, M8 - #2-56, #4-40, #6-32, #8-32, #10-24 1/4 inch, as well as a soldering iron adapter for soldering iron 900M / T18
Melting without damage - The precise geometry of the soldering tips protects the surface of the 3D printing part and prevents damage when inserting the threaded sleeves.
Easy to change the soldering tips - Thanks to the thread system in the soldering iron adapter, the soldering tips can be replaced quickly and without completely unscrewing the soldering iron.
Compatible with many soldering irons - Our soldering iron adapters are compatible with the 900M and T18 soldering iron heads e.g. For soldering stations from SREMTCH, Hakko, Lonovo, Rhaegon, WaxRhyed and much more.

16,90 €