Best Nut Inserts 2025

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Last Updated - 09/06/2025

Best Choice

01

Habwea

Habwea 308 Pieces Threaded Insert 3D Printing M2 M2.5 M3 M4 M5 M6 Threaded Inserts Melting Thread Brass Screw-In Nut with Soldering Iron Melting Aid Melting Thread for Plastic Parts

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9.9

Exceptional

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Main highlights

With heat set insert tips: Includes M2 M2.5 M3 M4 M5 M6 M8 soldering iron and M4 x 32 mm soldering iron adapters are tips for the thread inserts. Heat set insert tips inserting soldering tools – it is very easy to change the tip heads, no need to remove the whole tip, simply unscrew the tip head and Set a new set of
Wide application: this heating element is widely used and is suitable for 3D printer accessories, automotive parts, electrical appliance injection moulding, laptop injection moulded plastic shells and other areas. Whether at home, in the office or in industry, this set of nut inserts can meet your various needs, provide stable performance and long service life.
Perfect fit for your 3D printing: ideal basic equipment for 3D crafters, what makes this set special is the fact that it contains a set of matching melting tools. This set of melting tools consists of an adapter, fits very well on small soldering irons, for most 3D printing fans, the workmanship, especially the internal thread, is clean and precise.
High-quality material brass thread insert: the threaded inserts are made of corrosion-resistant brass for durability, and the non-slip external thread can increase friction when screwing in, making installation safer
Available in a range of different sizes: the assortment box includes embedding nuts M2.5, M3, M4, M5, M6 inch size and 8-piece soldering iron for ultrasound/thermal embedding. Sorted by quantity in clear storage boxes for easy access and protection.

15,99 €
02

Erzekrim

Erzekrim 310 Pieces Threaded Insert Melting Thread Brass Thread Inserts M2 M3 M4 M5 Melting Aid Set with Sorting Box for Plastic Parts by Melting into 3D Printing Parts (Yellow)

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9.6

Exceptional

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Main highlights

【Easy to use】: Powerful press-on nut, easy insertion of the press-on nut into a blind or through hole by means of ultrasonic or heat (soldering iron).
Widely used: threaded nuts are suitable for plastic injection moulding and processing processes such as PLA, PC, PA, PETG, ABS, PPS, PP etc. and serve as connections in 3D printers, wooden furniture, engine structure electronics and other plastic shells, locking and fastening functions.
Precision design: the soldering iron melting aid hexagonal edges are clear and the size is standard, which saves time and effort when using. Soldering iron tips with deep thread, even slope, not easy to slip, stable force.
High quality: the threaded insert is made of high-quality brass, which has a high hardness and corrosion protection and is not easy to wear. The precision male thread is non-slip, increases friction when screwing in and ensures a firm installation.
Easy to store: this thread insert and soldering iron melting aid set; there are 9 different sizes of thread inserts, equipped with plastic boxes. You can divide each size into different grids and label them to avoid confusion and make it easy to find.

15,99 €
03

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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9.5

Excellent

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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 €
Value for Money

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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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.

13,39 €
05

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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9.3

Excellent

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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.

8,49 €
06

HOLMOL

HOLMOL Threaded Insert 360 Piece Set, 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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9.2

Excellent

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Main highlights

Versatile: threaded inserts are ideal for electronics, 3D printing, laptop shapes and many more 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, 5pcs 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 €
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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9.1

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

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

HAOYULUO

Pack of 300 thread inserts, M2, M2.5, M3, M4, M5, M6, 1/4 melting thread, with sorting box, press-in nuts, threaded inserts, for 3D printing accessories and plastic parts by heat or ultrasonic

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15% Off
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

Wide range of applications: our screw-in nut sets are designed for all thermoplastics. The knurled shape is designed for attaching materials such as PLA, PETG, ABS, PPS, PP, etc. Threaded insert can be used for injection molding, PCB mounting and most plastic fasteners, fully automatic manufacturing process
Package contents: you will receive a box of 7 models and 15 sizes thread insert: M2, M2.5, M3, M4, M5, M6, 1/4, total 300 pieces melting threads in a practical plastic sorting box with corresponding sticker labels to avoid confusion, and the quantity is enough to meet your daily use needs
High-quality materials: our melting thread sets are forged from high-quality pure copper and ensure optimal corrosion resistance, acid and alkali resistance as well as thermal conductivity, strong oxidation resistance, deep threads with even pitch and can be carefully removed from the printed part when not in use and reuse next time, durable and durable
Friendly tips: this set of thread insert has heat press properties. During the pressing process, please preheat the melting thread, operators should wear insulating gloves to avoid safety accidents during the process.
Easy to assemble and use: this set of press-in nuts is simple and easy to use. Simply embed the threaded insert into the blind hole or through hole and then it can be firmly fixed in the printed part by the heat of a soldering iron or ultrasonic wave, so that the nut and installation object can form a certain friction and firm bite force, which can be adjusted to prevent falling off, making it easy and convenient to use

9,33 € 10,98 €(15% Off off)
09

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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8.8

Very Good

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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.

13,99 €
10

LuminaryLair

Pack of 100 Brass Press-in Nuts Knurled, M3 Brass Threaded Insert, Female Thread Insert Inserts, Brass Nuts Thread Insert for 3D Printing Components and Plastic Parts (3 x 4 x 5 mm)

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8.7

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

Wide applicability: the insert nut is suitable for a wide range of materials and areas, especially for steel construction, mechanical equipment, electronic products, injection moulding and various plastic connecting elements and other connections. Whether the material is PC, PA, PLA or ABS, it can be easily processed.
Sufficient quantity: you will receive a pack of 100 internal thread insert nuts, each size: length: 4 mm/0.15 inches, diameter: 5 mm/0.19 inches, inner diameter: 3 mm/0.12 inches, precise size, quantity and size can meet different needs.
Excellent material: 3D printing threads are made of high-quality brass with good corrosion and wear resistance. It retains its excellent performance and stability in harsh environments. It will not react chemically with airborne substances, causing rust or loosening.
Excellent craft: M3 press-in nut surface with twill thread design, high-precision internal thread can ensure a tight fit after installation, enough friction and bite, good stability to effectively prevent falling out.
Efficient installation: the installation process is simple and fast, just heat the brass embedding knurled nuts and press it into the component, then tighten the screws after cooling. No complicated tools or steps are required, which significantly reduces installation time and costs.

4,99 €