Best Nut Inserts 2026

Advertising Disclosure

Last Updated - 22.07.2026

Best Choice

01

LitOrange

290-Piece Threaded Insert Set M2 M3 M4 M5 with Digital Soldering Iron - Brass Melting Nuts Assortment for 3D Printing Accessories - Heat Set Insert Tool Kit Including M2-M8 Soldering Tips

Show more
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.

Show more
Main highlights

Why buy a thread insert set instead of individual parts? This thread insert set combines thread inserts, melting nuts and 3D printing accessories in one set. With 290 pieces (including m3 thread insert, thread insert m2 m4 m5) and complete tools, you save time when building and start directly in 3D printing projects, model making or DIY applications.
Safe & thoughtful - a set for the complete workflow: the soldering iron stand ensures safe storage of the hot soldering iron, while digital temperature control, matching heat set insert adapters and tweezers efficiently and reliably cover the entire process from heating to assembly - one set is enough for all steps
Precise digital soldering iron - fast heating & exact temperature control: the 80W digital soldering iron is equipped with an HD LED display and allows precise temperature adjustment from 180 °C to 500 °C for heat set inserts, melting nuts and other demanding 3D printing applications. Thanks to the powerful ceramic heating element, the soldering iron reaches the desired temperature in only approx. 10 seconds
Optimised size distribution - focus on M3 for real use: contains 270 threaded inserts in the most common sizes: M2 (70 pieces. ), M3 (100 pieces. ), M4 (50 pieces. ), M5 (50 pieces). The particularly frequently used M3 thread insert is deliberately higher dosed with 100 pieces for 3D printing projects such as housings, brackets and mechanical components, less replacement, more efficiency
Is the quantity enough for multiple projects? The distribution of the thread inserts is practice-oriented: M3 thread insert (100 pieces. ), complemented by thread insert M2, M4 and M5. This combination covers typical applications in 3D printing, model making and mechanical construction without frequent replacement.
Is the entire workflow covered with one set? In addition to thread insert set and melting nuts, the set includes tweezers and a soldering iron stand. From heating to insertion to storage, all steps are integrated. Suitable for structured workflows in workshops, DIY projects or 3D printing setup.
How can thread inserts be inserted precisely without overheating? The digital soldering iron with LED indicator allows controlled processing of heat set insert and melt thread at 180-500°C. The temperature can be precisely adjusted, which supports even results, especially with 3D printing materials such as PLA or ABS.
Do small melting nuts slip off easily when inserted? The 2 x brass adapters for thread insert ensure a stable hold when melting. Even with small sizes such as m3 melting nuts or m2, the position remains controllable. Suitable for precise work on 3D printing parts, housings or fine components.
All in one set, no replacement: this threaded insert set offers a complete solution for 3D printing accessories: with 270 melting nuts in the most used sizes (M3 thread insert 100 pieces, plus thread insert M2, M4, M5), a digital soldering iron with temperature control, soldering iron stand and 2 complete brass heat set insert adapter sets (M2-M8 incl. ) you are immediately startClear - durable, stable and without having to buy additional accessories
2 x brass heat set insert adapters - stable and non-slip: contains two complete brass adapter sets (M2, M2.5, M3, M4, M5, M6, M8 including adapter M4 x 34.5 x 6.5) for safe melting of thread inserts. The textured brass surface ensures better heat conduction, stable hold without slipping and is less prone to breakage. especially with small sizes like M2 / M2.5 for heat set inserts in 3D printing

31,99 €
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

Show more
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.

Show more
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 €
03

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

Show more
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.

Show more
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

13,99 €
Value for Money

04

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

Show more
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.

Show more
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

13,98 €
05

wisdomcreate

Pack of 80 Threaded Insert M4 Melting Thread Insert Nuts M4 x L6 x D6 mm Threaded Insert 3D Print Melting Nuts Threaded Inserts Brass Threaded Inserts for 3D Printing Components and Plastic Parts

Show more
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.

Show more
Main highlights

【Application】Designed for all thermoplastics, including PLA, PETG, ABS, PPS, PP and more, once the plastic of the part cools and hardens around the brass sleeve, the internal threaded sleeve is firmly anchored. These inserts are used in 3D printers, computers, digital cameras, plastic car parts, circuit board assembly, electronic products and most plastic fixtures etc.
Secure hold with easy application: simply heat the threaded inserts 3D pressure and press into the plastic. It can also be installed with a soldering iron or an ultrasonic device.
Practical thread insert set: M4 x L 6 x D 6 mm. The melting threads consist of 80 insertion nuts internal thread. The threaded inserts can be used for ultrasonic and thermal inserts. We offer different sizes of melting thread, please choose the most suitable product specification.
High-quality material durable: threaded insert made of high-quality brass for optimal corrosion resistance and thermal conductivity. The surface is smooth and burr-free and the threads are clear. Diagonal threads ensure a snug fit and increase torque strength.
Firm hold thanks to knurling: the spiral knurled nut provides a balanced high tightening torque and ensures a stable connection. Our melting threads install seamlessly on plastic components and resist torque as well as pulling out.

7,99 €
06

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

Show more
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.

Show more
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 €
07

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

Show more
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.

Show more
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 €
08

Gorffy

Thread Insert, Gorffy Pack of 170 Wooden Screw Nuts, M6/M8/M10 Alloy Steel Screw Sockets, Threaded Bushing, Thread Insert for Wooden Furniture, Silver Screw Nut with Box

15% Off

Show more
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.

Show more
Main highlights

Screw-in sleeve material: threaded insert wood steel with galvanised surface
Package Content:Contains 170 pieces screw in nut in total 13 sizes. 40 pieces M6 × 8, 30 pieces M6 × 10, 20 pieces M6 × 13, 10 pieces M6 × 15, 10 pieces M6 × 17, 10 pieces M6 × 20, 5 pieces M6 × 25, 10 pieces M8 × 15, 10 pieces pieces pieces M8 × 17, 10 pieces M8 × 20, 5 pieces M8 × 25, 5 pieces M10 × 20, 5 pieces M10 × 25
Easy to use: simple drill holes of the right size and lock the nut with a tool. Screw-in sleeves for quick and easy installation
Clever Design The threaded inserts are designed with a unique external and internal thread, which provides 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

10,99 € 12,99 €(15% Off off)
09

ANVINKU

Pack of 460 Threaded Insert 3D Printing, ANVINKU Brass Melting Thread, M2 M2.5 M3 M4 M5 M6 Melting Nuts 3D Printer, Knurled Internal Thread Melting Nuts, Thread Inserts for 3D Printer Accessories

Show more
8.5

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

Versatile Compatibility The thread insert works perfectly with most 3D printing filaments and other thermoplastics. Reliable performance for DIY prototypes, repairs and professional applications
Threaded insert assortment: this 460 pieces melting thread contains (50 pieces M2×2.5×3.2mm, 40M2×3×3.2mm, 40M2×4×3.2mm, 40M2×6×3.2mm, 30M2.5×4×3.5mm, 30M2.5×53,5 mm, 5 mm, 3M6×4×3.5mm, 30M3×4×5mm, 30pcs M3×5×5mm, 30M3×6×5mm, 22M4×4×6mm, 22M4×5×6mm, 22M4×5×6mm, 22M4×8×6mm, 12M5×6×7mm, 12M5×10 ×7mm, 6 M6 x 8 x 8 mm, 6 1/4-20 x 12.7) 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) common sizes for your 3D printers
PRECISION MELTING NUTS The exterior knurled surface provides exceptional grip. The 3D printing thread inserts with twist and tear protection ensure that the thread remains permanently durable and corrosion-resistant and the precision of the 3D-printed layers is ensured
High quality insert nuts: melting thread made of high quality brass. The thermosetting inserts are characterised by exceptional thermal conductivity as well as resistance to deformation and corrosion. They provide long-term stability in applications such as 3D printers, automotive components and plastic housings
Easy to use: simply heat the insert, press into a pre-drilled hole and allow to cool. Threaded inserts are suitable for embedding in 3D printer accessories and provide a reliable and secure mounting solution for components

15,98 €
10

Hapric

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

Show more
8.4

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

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 €