Best Plastic Threaded Inserts in 2026

RUTHEX SOLDERING TIPS FOR RUTHEX THREAD INSERTS: The ruthex soldering tips make it even easier to retrofit thread inserts into 3D printed parts of 3D printers from e.g. Anycubic or Prusa.

PRACTICAL CHANGE SYSTEM: Due to the thread in the soldering iron adapter, the soldering tips can be changed very easily WITHOUT completely unscrewing the soldering iron.

INSERTION HELP COMPATIBLE for soldering iron heads 900M and T18 for example for soldering stations SREMTCH, Hakko, LONOVO, RHAEGON, WaxRhyed and other brands. Dimensions of the soldering iron adapter can be taken from the drawing.

✅【BRASS MATERIAL】These female thread brass knurled threaded insert embedment nuts are made of durable brass. High strength without deformation, abrasion and corrosion resistance and with beautiful and practical

✅【VARIOUS SIZES TO CHOOSE】We prepare various sizes for your choice to meet all your needs. Assortment kit or one specific size, we have it all. Smooth surface with no burr, standard circular, firm and uniform, easy to install.

✅【STRANDARD AND COMPLETE THREAD】Deep thread, neat and clean, not easy to strip during rotation, stable and reliable. No need to counterbore or countersink the boss hole because the insert has guide pilot.

✅【Well MADE AND QUALITY】These female thread brass knurled threaded insert embedment nuts are made of durable brass. High strength without deformation, abrasion and corrosion resistance and with beautiful and practical

✅【EXCELLENT WORKMANSHIP】Smooth surface with no burr, standard circular, firm and uniform, easy to install. We meet all your needs. Assortment kit or one specific size, we have it all.

✅【STRANDARD AND COMPLETE THREAD】Deep thread, neat and clean, not easy to strip during rotation, stable and reliable. Convenient operation, good texture, greatly improve your work efficiency

40Pcs of Stainless Steel 1/4”-20 Rivet Nuts Threaded Insert. Flat head with knurled round body. Strong and corrosion resistant.

Thread pitch: 1/4”-20 (1/4” is the inner thread diameter. 20 means there are 20 threads in per inch).

Grip Range:0.5-3mm/0.019”-0.118”; Body Diameter: 8.9mm / 0.350".

【🌂】 Package: 120pcs M3 Knurled Nuts Inserts;

【🌂】- Product name: M3 Threaded Laptop 3D Printer Inserts Nuts;

【🌂】Thread: M3; - Color: Bronze Tone; - Material: Brass;

➤[15 Size] Brass thread inserts kit includes 15 assorted of size that contains M2x4x3.5mm, M2x6x3.5mm, M2x8x3.5mm, M2x10x3.5mm, M3x4x5mm, M3x6x5mm, M3x8x5 mm, M3x10x5mm, M4x4x6mm, M4x6x6mm, M4x8x6mm, M4x10x6mm, M5x6x7mm, M5x8x7mm, M5x10x7mm.

➤[High Quality Material] These female thread brass knurled threaded insert embedment nuts are made of durable brass with high hardness and wear resistance, oxidation resistance, strong corrosion resistance and long service life.

➤[Excellent Workmanship] The embedment nut has a high-precision thread that is compatible with the corresponding screw and the insert has a guide so there is no need for a counterbore or countersink. Smooth surface with no burr, standard circular, firm and uniform, easy to install.

Type of Product: Brass Threaded Insert Embedded Nuts Assortment Kit.

Product Material: Made of premium brass, which has high hardness, no deformation, durable and reliable for long time use.

Package Detail: In this set, it include 10 kinds of m2, m2.5, m3 knurl thread inserts nuts total 500pcs which are well packed in a plastic box.

Good Performance: these M3 brass nuts can be widely used in 3D printing injection molding to achieve tight fixation. Heat set Inserts can be installed by ultrasonic or heat into thread tapered hole, or molded in during injection. Just using tools such as a soldering iron or screws, you could easily set brass embedment screws into 3D printed holes.

Premium craftsmanship: the M3 brass nuts are manufactured with high-quality craftsmanship to ensure that all nuts have uniform and fixed standard round and twill thread knurl. The diameter of the front end of the nut is slightly smaller, so that you can easily align the nut in the reserved 3D printing hole. Compared with the ordinary straight-grain knurl, the twill thread knurlhas better pull-out and torque resistance, so that it will not shake and is easy to fix.

Durable material: all nuts are made of high-quality brass, which can prevent rust and oxidation, high temperature resistance, corrosion resistance, not easy to deform and have good thermal conductivity, which makes the nuts can be heated quickly and easily inserted so as to greatly shorten your work time.

【Various Sizes to choose from】This is a 170ps assortment kit which include M2*3*3—20PCS,M2*4*3.2—PCS,M2.5*3*3.5—20PCS,M2.5*6*4—20PCS,M3*3*4.2—20PCS,M3*4*4.5—20PCS,M3*5*4.5—20PCS,M3*5.7*4.6—30PCS,total 8 sizes of M2 and M3 to meet most of your needs.

【Designed for 3D printing parts and other plastic parts】 These inserts are widely used in 3D printing and other plastic parts such as PLA,PETG,ABS,PPS,PP etc., they can firmly secure two different parts together and make it look professional.

【Made of H62 Hard Brass】These heat set inserts are made of H62 High quality material, hard ,durable and corrosion-resisted at the same time ensures good thermal conductivity.

【Detailed Dimensions】1/4"-20 x 10mm/15mm/20mm/25mm, 4 sizes commonly used threaded inserts in a plastic case, different sizes can satisfy your different needs. Internal thread insert type: 1/4"-20, thread type: 20 threads per inch, coarse thread, fit standard 1/4 20 screws bolts perfectly.

【Color Zinc Plated Steel】Made of high quality carbon steel, color zinc plated on the surface which have good corrosion resistance in bad environment like high temperature, high hardness and perfect wear resistance, standard internal hex socket, without burr, smooth, non-slip, which can ensure long time using.

【Easy To Install】You can drill a hole by using a 3/8" drill bit, ensure a precise 90 degree angle for inserting the threaded inserts, then you need to screw the inserts into the 3/8" holes by using our hex wrench. Make sure you countersink the hole to head size before you insert the threaded sleeve, fit standard 1/4 20 screws bolts perfectly.

★ 【Sizes】Brass thread inserts kit includes 4 assorted of size that contains M2，M2.5，M3,M4.Come with a plastic box, each size be placed in a single grid, no mess and easy to find.

★ 【Material】Made of high quality environmentally friendly brass material, high strength and hardness, strong tolerance, the force is evenly tightened, you can use it for a long time.

★ 【Excellent Workmanship】 The embedment nut has a high-precision thread that is compatible with the corresponding screw and the insert has a guide so there is no need for a counterbore or countersink. Smooth surface with no burr, standard circular, firm and uniform, easy to install.

Screw-on design fits most popular files

For professionals or DIYers

Handle made of strong high-impact material

【Size list】M2*4*3.5 – 30Pcs, M2*6*3.5 – 30Pcs, M2*8*3.5 – 30Pcs, M2*10*3.5 – 20Pcs, M3*4*5 – 30Pcs, M3*6*5 – 30Pcs, M3*8*5 – 20Pcs, M3*10*5 – 20Pcs, M4*4*6 – 30Pcs, M4*6*6 – 20Pcs, M4*8*6 – 20Pcs, M4*10*6 – 15Pcs, M5*6*7 – 15Pcs, M5*8*7 – 10Pcs, M5*10*7 – 10Pcs.

【High quality material】Our products are made of high-quality brass, which is more beautiful and durable than iron materials.

【Assortment boxed】This product is classified and packaged in high-quality PP boxes, which is easy to store and classify.

【Designed for Injection Molding】: With deep & clear knurls, the threaded inserts will add enough strength to screw connections when inserted into plastic components. The softened plastic will flow into the knurl pattern and then harden to form a firm bond with the insert.

【High-quality Material】: Made of premium brass material, our threaded insert for plastic has both aesthetics and high strength, which can be used for a long time. And the high thermal conductivity of brass thread inserts means faster heating and insertion into plastic parts.

【How to Use】: Female thread knurled insert nuts are suitable for mounting into tapered holes by heating or for molding during injection molding. You can use a soldering iron to heat it up and then pressing it into the hole. It is easy to control and at a low cost.

THREADED INSERTS FOR PLASTIC – E-Z Sonic ultrasonic thread inserts for plastic are designed for post-molding installation in thermoplastic materials.

EASY INSTALLATION – Install these metal threaded inserts ultrasonically or with a heat driver. The tapered design simplifies installation.

FOR USE WITH APPLICATIONS – The threaded inserts for plastic are designed for putting standard machine threads in 3D printed and thermoplastic parts.

EASY TO INSTALL: These self-tapping thread inserts has self-tapping ability, does not need to be pre-tapped, can be directly used by the installation tool to screw it into a specific hole.

SAFE: Threaded Insert has the ability of strong vibration resistance, which can prevent loose.Can be used in many different places.

HELP TO MAINTENANCE: A damaged screw hole can be used as normal after installed a thread insert.

1.☛[15 Assorted Sizes] --- This set contains 300 pieces select thread inserts in 15 different sizes(Thread Size x Height x Outer Dia.): M2x3x3.5,M2x4x3.5,M2x6x3.5,M2x8x3.5,M3x6x5,M3x8x5,M3x10x5,M4x6x6,M4x8x6,M4x10x6,M5x6x7,M5x8x7,M5x10x7,M6x10x7,M6x12x7. Comes with sturdy case for convenient storage.

2.☛[Quality Brass Material] --- With excellent conduction of heat, heat tolerance, rust and corrosion resistance, wear resistance. These brass threaded inserts for plastic are strong enough to provide easy insertion and long service life.

3.☛[Exquisite Workmanship] --- These brass inserts are made in strict accordance with standard. The nice, threaded thru hole are clean without burr, accurate, uniform, not easy to deform, offering secure and durable performance.

Size M2.5 insert,Total 70pcs The insert Overall Length=5.8mm,OD4.6mm

<b>Designed for 3D printing parts and other plastic parts<b> These inserts are widely used in 3D printing and other plastic parts such as PLA,PETG,ABS,PPS,PP etc., they can firmly secure two different parts together and make it look professional.

<b>Made of Quality Brass<b> These heat set inserts are made of High quality brass, hard ,durable and corrosion-resisted at the same time ensures good thermal conductivity.

√ Quantity: VIGRUE this nuts kit includes 340pcs of M2 M2.5 M3 M4 M5 M6 Thread Knurled Nuts, and it includes 12 various common sizes knurled nuts, sufficient for daily application.

√ Great Performance: Thanks to the outside oblique threads, it holds firmly in the pressure part and ensuring a high balanced tightening, once heated plastic around the brass sleeve nuts cools and hardens, the threaded nuts are firmly anchored

√ Organized Box: The nuts come in a portable clear box with corresponding sizes label. It is convenient for you to put away and store, which allow you to get the one you need quickly, improving your project efficiently.

- Thread: M3; - Color: Bronze Tone; - Material: Brass;

- Product name: M3 Threaded Inserts Heat Set Nuts;

- Package Weight: 240g; - Pitch: 0.5mm; - Size including: M3 x 3 x 5mm, M3 x 4 x 5mm, M3 x 5 x 5mm, M3 x 6 x 5mm, M3 x 8 x 5mm, M3 x 10 x 5mm, M3 x 12 x 5mm;

Package Content: You will get 100pcs 3D printing brass nuts, super large quantity can meet your needs of connecting numerous 3D printing accessories. Each knurled brass nut measures about M3x4x5mm / M3x0.16x0.2inch, please ensure that the size of the nuts can well match your 3D printer.

Premium Material: The threaded inserts for 3D printing are made of high quality brass, extremely sturdy, not easy to break or deform, also can withstand high temperature above 300°C / 572°F. Excellent thermal conductivity also makes your 3D printer to work more effectively.

Easy to Install: The knurled brass nuts can be easily installed into the the tapered holes of 3D printers by heating, also can be molded by injection molding. The 3D printing brass nuts with full knurled patterns can perfectly match with your 3D printers. Practical nuts make your 3D printer work well.

T-NUTS ARE A PRESS-IN TYPE OF THREADED INSERT - EASLY INSTALLED WITH A HAMMER.

USED WITH SOFT MATERIALS SUCH AS WOOD OR PLASTIC.

HAS SHARP PRONGS UNDER THE FLANGE THAT DIG INTO THE MATERIAL LIKE A NAIL.

SUITABLE: The self-tapping thread insert is a kind of fastener that strengthens the thread, which can form a high-strength inner thread hole when embedded in a soft material such as plastic, copper. It can also be used to repair the damaged inner thread.

MATERIAL: Made of high quality stainless steel, it is of high hardness and low abrasion,Greatly improve strength and stability of screws connection

ADVANTAGE: With certain elasticity and even load, it is resistant to vibration to avoid loosening,Long service life - it can be used repeatedly.

【Handy Tool to Install Inserts】 This heat press is a handy tool to install inserts into 3D printed parts. The iron tip heats up the brass tip and softens plastic, allowing you to install inserts into the part. Once it cools down, the nuts are fixed in place.

【Adjustable Metal Bar】 The horizontal aluminum extrusion profile is adjustable so that you can adjust the position of the soldering iron without moving it in operation, which is safer.

【Metal Handle】 The handle on the soldering iron will make it easier to press down the insert nuts into the part, especially when you need to do it repeatedly.

♛ High Quality Knurl Thread Inserts Nuts Assortment Kit

♛ Mateiral: Brass; Size include: M2 / M3 / M4

♛ Package Quantity: 250pcs - Packed in A Rugged Convenient Re-sealable Plastic Storage Case

Product Name: Threaded Inserts; Finish: Nickel Plated; Color: Silver Tone; Inner Thread Size: M6 x 1((Dia.x Pitch); Outer Thread Size: M10 x 1.5(Dia.x Pitch); Length: 14mm / 0.55"

Min. Drilling Size: 3 x 5.5mm / 0.12"x0.22"(wide*depth); Reference Drilling Diameter: 12.6-12.8mm(Plastic), 13-13.3mm(Aluminum Alloy), 13.2-13.4mm(Cast Iron)

Material: Carbon steel material, suitable for aluminum alloy, copper alloy, plastic and other substrates with low engineering strength. Strong resistance to vibration, can prevent loosening.

Package Includes: You will get 100 M3 inserts, threaded inserts enough for you to attach numerous 3D printed parts. Premium threaded inserts for 3D printing come in an eco-friendly plastic bag that is durable in every way.

Product Size: The brass threaded insert heat inserts measure approximately 5.7 x 4.6 cm and the special thread design makes it easier to handle. These m3 inserts 3D printing can be used extensively for injection molding for tight fixing.

Quality Materials: These double pass threaded inserts are made from high quality durable brass with rust and oxidation resistance, good thermal conductivity, rust-proof, corrosion resistant, non-toxic, acid resistant, and do not release harmful substances. The brass threaded insert embedment nuts have excellent outstanding thermal conductivity, and are very strong, hard, and threaded insert resistant to breakage or deformation to ensure you get long term use.