Best Nut Inserts 2026

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Last Updated - 03.02.2026

Best Choice

01

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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9.9

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

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 €
02

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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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

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

13,99 €
03

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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9.7

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

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 €
Value for Money

04

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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9.6

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

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.

8,99 €
05

Bolatus

Pack of 50 Thread Insert M3, 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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9.5

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

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

5,99 €
06

LCXCXY

Threaded Insert Set of 300 Insertion Nuts PP Box with Tag M2 M2.5 M3 M4 M5 M6 Brass Threaded Inserts Knurled Melting Thread Suitable for Plastic Parts in Threaded Insert 3D Printing

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9.4

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: brass thread insert M3 M4 are often used in the electronics industry, in the construction industry and 3D printing thread inserts. By hot melting, hot pressing, ultrasonic welding and injection moulding, knurled threads and plastic parts are firmly together.
Packaging details: thread inserts include 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 x 5, M3 x 6 5, 5, 5, 30pcs 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, each 10 pieces. M6 x 8 x 8, each 10 pieces 1/4-20 x 12.7 x 8, total 300 pieces.
High-quality material: the threaded insert is made of high-quality brass with clear and deep thread, high hardness, corrosion and oxidation resistance as well as good thermal and electrical conductivity, which makes it durable.
Exquisite label: the melting thread kit is equipped with a special label. The label corresponds to the 15 square grid design of the PP plastic box. It features the different models and quantities of threaded inserts, so there are no confusion and it is practical to find and use.
Easy to carry: Our press-in nuts are equipped with a PP plastic box. 7 models and 15 sizes of threaded sleeve are arranged in a neat 15 square grid. The top of the PP plastic box features a hook opening for easy transport and storage.

10,99 €
07

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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9.3

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

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 €
08

Gorffy

Gorffy Pack of 150 Threaded Nuts Wood, M6/M8/M10 Alloy Steel Screw-In Sleeves, Threaded Bushing, Thread Insert for Wooden Furniture, Silver Thread Insert with Box

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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

Screw-in sleeve material: threaded insert wood steel with galvanised surface.
Package contents: contains 150 screw-in nuts in a total of 13 sizes. 20 pieces M6 × 8, 20 pieces M6 × 10, 20 pieces M6 × 13, 10 pieces M6 × 15, 10 pieces M6 × 17, 10 pieces M6 × 20, 5 pieces M6 × 25, 15 pieces M8 × 15, 10 pieces pieces pieces M8 × 17, 10 pieces M8 × 20, 10 pieces M8 × 25, 5 pieces M10 × 20, 5 pieces M10 × 25.
Easy to use: simply drill holes in the right size and secure the nut with a tool. Screw-in sleeves for quick and easy installation.
Clever design: the threaded inserts are equipped with a unique external and internal thread, which ensures torsion and vibration resistance as well as stability when connecting wooden furniture. After installation, they do not slip easily even with high frequency vibrations.
Applications: screw-in nuts are precisely wound, firmly inserted and resistant to loosening. Threaded inserts are suitable for use with pine, plywood, fiberboard and other softwoods and are ideal for furniture assembly.

12,99 €
09

HOLMOL

HOLMOL Threaded Insert Set of 150 Brass Melting Thread M3 x 4 x 5 mm for Plastic, Knurled Insert Nuts for 3D Printing Accessories and DIY Projects, Thread Inserts with Tweezers

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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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Main highlights

Versatile: threaded inserts are ideal for electronics, 3D printing, laptop shapes and many other DIY applications
Precise knurled thread: the knurled thread ensures a strong hold and prevents pulling out, especially when used in 3D printed parts
Includes: 150 pieces M3x4x5 mm knurled melting threads for 3D printing and tweezers
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

6,69 €
10

ruthex

ruthex Voron M3 Threaded Insert, Pack of 100 RX-M3x5x4 Threaded Bushings Made of Brass, Sturdy Insert Nut for Plastic Parts, Heat Insertion in 3D Printed Plastic Parts

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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.

Show more
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-M3x5x4 thread insert set consists of 100 insert nuts with M3 internal thread, a width or 5 mm and a length of 4 mm. The threaded sleeves can be inserted through ultrasonic insertion and heat embedding.
M3x5x4 thread inserts for your 3D printed parts: The ruthex threaded nuts can be subsequently inserted in parts from 3D printers by, for example, Anycubic, Creality 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. The guide makes insertion much easier.

9,49 €