7 Best Threading Inserts for 2026

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More Details on Our Top Picks

1. Surebonder Threaded Insert Tool (8510)

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   Best Tool

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   If you need a compact, durable tool for installing threaded inserts in thin plastic, fiberglass, or metal, the Surebonder 8510 is a strong choice. It features durable steel construction, a comfort-grip spring-loaded handle, and a depth-stop dial that helps prevent thread damage from over-squeezing. It includes five mandrels and five nose pieces for 6-32, 8-32, 10-24, 10-32, and 1/4-20 sizes, plus fine and coarse options. It weighs under 1.8 pounds, and it works with Surebonder Quik-Threads rivets. Do not use it in wood.

   • Insert Type:Threaded insert tool
   • Thread Size:6-32 to 1/4-20
   • Material:Steel
   • Application:Plastic/metal
   • Installation Method:Hand tool
   • Quantity:1 tool
   • Additional Feature:Comfort-grip handle
   • Additional Feature:Spring-loaded handle
   • Additional Feature:Depth-stop dial

2. 14 Pcs Carbide Turning Inserts for Grooving Threading

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   Best Metal Inserts

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   The 14 piece Joogto carbide turning insert set is a strong choice for machinists, shop owners, and serious DIY users who need precision grooving, threading, turning, or boring in one compact kit. You get 3/8 inch, 10 mm carbide inserts made from cemented carbide and tungsten steel for high hardness, shock resistance, and long service life. The indexable design helps you cut smoothly, change inserts less often, and keep work moving. It is suitable for professional or home projects, and Joogto backs it with 24 hour support, a 3 month refund, and a 360 day warranty.

   • Insert Type:Turning inserts
   • Thread Size:3/8 in / 10mm
   • Material:Carbide
   • Application:Lathe machining
   • Installation Method:Lathe use
   • Quantity:14 pieces
   • Additional Feature:High-speed capability
   • Additional Feature:Shock-proof durability
   • Additional Feature:360-day warranty

3. 400Pcs Metric Brass Threaded Inserts Assortment Kit

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   Best for 3D Printing

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   This 400-piece metric brass threaded inserts assortment kit is a strong choice for anyone working with 3D printed parts, plastic housings, or electronics enclosures that need durable female threads. It includes M2 through M6 sizes in heat-set brass, with clear, high-precision threading and 45-degree knurling for a secure grip. You can install them with heat, ultrasonic tools, or during molding, and they work well in PLA, PETG, ABS, and more. They resist corrosion, deformation, and heat above 300°C, so you get reliable fastening.

   • Insert Type:Heat-set inserts
   • Thread Size:M2 to M6
   • Material:Brass
   • Application:3D printing
   • Installation Method:Heat set
   • Quantity:400 pieces
   • Additional Feature:45-degree knurling
   • Additional Feature:Heat-resistant above 300°C
   • Additional Feature:No countersinking needed

4. E-Z Lok Threaded Insert Stainless Steel (Pack of 10)

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   Best for Wood

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   E-Z Lok’s 400-4-CR stainless steel threaded insert is a strong choice when you need a durable 1/4″ – 20 insert for hard woods like oak, cherry, or maple. You get 10 inserts made from 18-8 stainless steel, and their knife threads bite into wood for solid holding power. This design helps prevent stripping and thread wear in furniture, cabinets, and displays. You can install it with a screwdriver, bolt, or jam nut, and the optional E-Z LOK drive tool makes the job easier. Its corrosion resistance adds long-term reliability.

   • Insert Type:Wood inserts
   • Thread Size:1/4-20
   • Material:Stainless steel
   • Application:Wood
   • Installation Method:Screw-in
   • Quantity:10 pieces
   • Additional Feature:Knife-thread design
   • Additional Feature:Stainless steel construction
   • Additional Feature:Optional drive tool

5. Kadrick Threaded Inserts Assortment Kit for 3D Printing

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   Best Value

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   Kadrick’s 520-piece threaded inserts assortment kit is a smart choice when you want durable metal threads for 3D-printed parts or other plastic components. It includes brass knurled heat-set inserts in M2, M3, M4, and M5 sizes, so you can match different fasteners without needing to buy extras. The fully threaded, right-hand design grips plastic well, and the brass construction provides strong heat conduction, corrosion resistance, and solid tensile strength. The labeled compartment box keeps each size organized. With a 4.8-star rating and 24-month support, it is a practical, reliable option.

   • Insert Type:Heat-set inserts
   • Thread Size:M2 to M5
   • Material:Brass
   • Application:3D printing
   • Installation Method:Heat set
   • Quantity:520 pieces
   • Additional Feature:Independent compartments
   • Additional Feature:Clear labels
   • Additional Feature:24-month warranty

6. SNR0013M16 CNC Lathe Internal Threading Boring Bar Tool Holder

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   Best Threading Kit

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   Built for tight space jobs, the SNR0013M16 CNC lathe internal threading boring bar tool holder is ideal when you need to cut internal threads in small holes with a compact right hand setup. It includes a 150 mm 40Cr steel boring bar with a 13 mm shank, plus 11 16IR AG60 carbide inserts and a T15 wrench. The TiN coated inserts are well suited for steel, offering high hardness, low friction, and strong wear resistance. With a 0.5 to 3.0 mm pitch range, you can perform precise internal threading efficiently in tight bores.

   • Insert Type:Threading tool holder
   • Thread Size:16IR AG60
   • Material:Steel/carbide
   • Application:Internal threading
   • Installation Method:Machine tool
   • Quantity:11 pieces
   • Additional Feature:40Cr steel bar
   • Additional Feature:TiN-coated inserts
   • Additional Feature:T15 wrench included

7. 10PCS 16ER AG60 CNC Lathe Threading Carbide Inserts

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   Best for CNC Threads

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   If you need a reliable threading insert for steel parts, the 10PCS 16ER AG60 CNC lathe carbide set is a strong choice. You get 10 external, right-cut inserts in the 16ER AG60 / 16IR AG60 format, with a 60 degree universal pitch and a 0.5 to 3.0 mm machining range. Their fine-grained carbide body and nanostructured TiAlN coating help resist wear, built-up edge, and chipping. Use them for semi-finishing and finishing when you want precise threads. Each triangle insert has three cutting edges, and the ASZLBYM set fits compatible indexable turning tools.

   • Insert Type:Threading inserts
   • Thread Size:16ER AG60
   • Material:Carbide
   • Application:External threading
   • Installation Method:Machine tool
   • Quantity:10 pieces
   • Additional Feature:Triangular cutting shape
   • Additional Feature:Three cutting edges
   • Additional Feature:Nanostructured TiAlN coating

Factors to Consider When Choosing Threading Inserts

When you choose threading inserts, you need to match the insert to the material you are cutting and the thread size range you are targeting. You should also consider the insert material, the application method, and how well it fits your tool holder. Getting these factors right helps you cut threads cleanly and keep your setup running smoothly.

Material Compatibility

Material compatibility is essential because the insert has to suit both the workpiece and the operating conditions. Match brass heat-set inserts to plastics such as PLA, PETG, ABS, PPS, and PP, since they transfer heat well and resist corrosion. If you are threading harder metals or running high-speed machining, choose steel or carbide inserts for better wear resistance and cutting stability. For internal threading in steel, carbide inserts rated for steel and pitch ranges around 0.5 to 3.0 mm help keep the cut steady. Use wood-specific threaded inserts only in wood, especially hard species like oak, cherry, and maple. For thin sheet materials such as plastic, fiberglass, or metal, pick insert tools and rivet nut styles made for those substrates, and avoid wood-focused designs entirely.

Thread Size Range

Choose the exact thread size your application calls for, whether that is metric M2 to M6 or imperial sizes like 6-32, 8-32, 10-24, 10-32, and 1/4-20, because a mismatch will not seat or hold properly. Confirm that the kit covers the size range you need. Some sets provide only one diameter, while others let you work across four, five, or six sizes, which helps when you handle varied jobs. Check the insert’s internal thread and the compatible hole or groove diameter so the outer fit locks into the drilled or molded opening. Then verify coarse or fine pitch options to match the mating screw. For plastic parts, pick a range that fits the load and part thickness, since smaller inserts suit light-duty use and larger ones hold more.

Insert Material

The insert’s material sets the tone for performance, so match it to the workpiece and installation method. You’ll get the best results when you choose brass for plastic and 3D printing, stainless steel for hard wood or corrosion resistance, and carbide for metal threading and high-speed cutting. If you’re working with thin plastic or fiberglass, steel threaded inserts can provide strong, durable threads. Brass heat-set inserts also work well because they conduct heat efficiently and resist corrosion, and they can handle temperatures above 300°C. Carbide is a strong choice when you need precision machining, low friction, and long service life, since it is much harder and more wear-resistant than steel or brass. Stainless steel provides strength and deformation resistance.

Application Method

Installation method matters just as much as size or material, so match the insert to how you will put it in place. If you are working with plastics, pick heat-set, ultrasonic, or molded-in inserts that suit thermoplastics like PLA, PETG, ABS, PPS, or PP. For wood, choose inserts you can drive in with a screwdriver or tighten with a bolt and jam nut; external cutting threads help them bite. For metalworking, use threading inserts designed for machine-tool use with a lathe holder or boring bar, not hand installation. Also check whether you need a dedicated driver, soldering iron, or ultrasonic tool, or whether standard hand tools will do. When you match the method to the material, you will install faster and get more reliable threads.

Tool Holder Fit

A good tool holder is the anchor for a threading insert, so match the insert’s shape, size, and numbering system to the holder’s pocket or clamp to make sure it seats fully and cuts at the right angle. You also need to verify that the holder fits the same thread style and pitch range, such as a 60 degree universal insert for 0.5 to 3.0 mm pitches. Check the cutting direction carefully because internal and external inserts are not interchangeable. Then confirm the holder’s shank diameter, insert thickness, and edge orientation line up with the geometry to prevent wobble or weak clamping. Once the fit is right, the holder supports the insert securely, keeps the cutting edge stable under load, and helps you maintain accurate threads.

Durability And Wear

Durability and wear matter because they determine how long your threading insert can hold a clean edge under real cutting conditions. You should favor cemented carbide or tungsten steel when you need stronger hardness, better shock resistance, and longer service life than softer options. Look for TiN or TiAlN coatings, since they reduce friction and slow built up edge during repeated passes. When you run high speed or precision threading, choose inserts built to maintain edge stability and reduce tool changes. In hot jobs, verify that the material can handle temperatures above 300°C / 572°F without losing strength or warping. Also check thread stability and gripping features, because slippage and poor engagement can chip edges fast. Strong wear control keeps your cuts consistent and your costs down.

Frequently Asked Questions

Which Thread Insert Type Works Best for Aluminum?

For aluminum, you will usually get the best results with sharp, polished, single-point or laydown carbide threading inserts that break chips cleanly and resist built-up edge. This helps you cut smoother, cleaner threads.

How Do I Prevent Thread Inserts From Stripping?

Treat threads like a bridge. Prevent stripping by using the right insert, the correct tap size, proper torque, clean holes, and threadlocker when needed. Also avoid cross-threading and over-tightening.

Can Threading Inserts Be Reused After Removal?

Yes, threading inserts can sometimes be reused after removal if they are undamaged, but they should not be forced back into service. Inspect the threads, wear, and coating first, because damaged inserts will not hold reliably.

What Size Pilot Hole Is Needed for Threaded Inserts?

You need a pilot hole sized to the insert’s outside diameter, not the screw’s. Check the manufacturer’s chart, drill to that size, and test-fit. If it is tight, slightly enlarge the hole.

Do Threading Inserts Require Special Installation Tools?

A threading insert is like a key in a lock. You do not always need special tools, but you often do. You will usually use a drill, tap, and driver. Some inserts require proprietary installers.