350Pcs Threaded Inserts, M2-M6 Heat Set Inserts for 3D Printing
4.9Editor score
Variety of length options included
High thermal conductivity brass material
Transparent storage box for access
10 Best Brass Threaded Inserts (October 2026) Expert Guide
Brass threaded inserts provide durable metal threading inside plastic or wood parts. They prevent wear and stripping during repeated assembly. Choosing the right set ensures secure connections for electronics and furniture.
We reviewed ten highly rated kits covering metric and SAE sizes. Our analysis focuses on material quality, thread design, and included tools. This helps you find the best fit for your specific project needs.
Each pick highlights unique features like knurling styles or storage cases. Prices and availability fluctuate so check current listings before buying. We update this guide regularly to reflect the latest market options for makers.
Top 3 Picks for Best Brass Threaded Inserts
600+7Pcs Brass Threaded Inserts M2 M2.5 M3 M4 M5 M6 for 3D Printing
4.7Editor score
Includes heat-set tips and adapter
45-degree spiral knurling design
Organized labeled storage case included
Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4"-20 Knife Thread Inserts (10pcs), Drill, Installation Tool
5.0Editor score
Includes drill bit and tool
Premium solid brass construction
All-in-one installation kit set
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Top 10 Best Brass Threaded Inserts in 2026 Compared
This side-by-side table lets you compare key specifications across all ten top picks. Look at thread types sizes included accessories and materials to find the right match for your project requirements and budget constraints.
ProductsSpecificationsEditor scorePrice
Editor's Choice
600+7Pcs Brass Threaded Inserts M2 M2.5 M3 M4 M5 M6 for 3D Printing
M2 to M6 metric sizes
Includes heat-set tips
Lead-free brass material
45-degree spiral knurling
4.7Editor score
Editor's Choice
400Pcs Metric Heat Set Insert, M2 M2.5 M3 M4 M5 M6 Female Thread Knurled Nuts Assortment Kit, Brass Threaded Inserts for Plastic and 3D Printing Components (Threaded Inserts Ket)
400 pieces total count
M2 to M6 metric sizes
High-precision threading
Guiding elements included
4.8Editor score
Best Premium
KADRICK M2-M5 Heat Set Insert Kit,520PCS Thread Inserts for 3D Printing
520 pieces total count
M2 to M5 metric sizes
Height range 3mm to 12mm
Independent labeled compartments
4.8Editor score
1/4"-20 Threaded Insert for Hard-Wood, Brass Knife Thread Inserts, 1/4"-20 Internal Threads, 0.5" Length, Pack of 25
1/4-20 thread size
0.5 inch length
Solid brass material
25 pieces per pack
4.7Editor score
E-Z LOK Thread Insert for Hard Wood, 0.25-20, 0.75 in, 10 ct
0.25-20 thread size
0.75 inch length
Easy screwdriver install
Hard wood application
4.7Editor score
513Pcs SAE Threaded Inserts, #2-56#4-40#6-32#8-32#10-32 1/4"-20 Female Thread Knurled Nuts Assortment Kit, Brass Heat Set Insert for Plastic and 3D Printing Components
513 pieces total count
SAE thread sizes included
Includes heat-set tips
45-degree knurling
4.6Editor score
607Pcs Threaded Inserts for Plastic, Heat Set Inserts M2/2.5/3/4/5/6
607 pieces total count
M2 to M6 sizes
Includes heat insert tool
Universal thermoplastic compatibility
4.6Editor score
Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4"-20 Knife Thread Inserts (10pcs), Drill, Installation Tool
Includes drill bit tool
10 pieces included
All-in-one kit
Solid brass material
5.0Editor score
350Pcs Threaded Inserts, M2-M6 Heat Set Inserts for 3D Printing
350 pieces total count
M2 to M6 sizes
45-degree helical knurling
Anti-corrosion brass
4.9Editor score
Taytools 25 Pieces 1/4-20 Threaded Inserts Solid Brass for Hardwoods, Softwoods, Plywood and Composites Knife Threads (1/4-20, 25)
25 pieces per pack
1/4-20 thread size
Solid brass construction
Knife thread design
4.5Editor score
1. 600+7Pcs Brass Threaded Inserts – Best Overall Brass Threaded Inserts
600+7Pcs Brass Threaded Inserts M2 M2.5 M3 M4 M5 M6 for 3D Printing
M2 to M6 sizes
Lead-free brass material
45-degree spiral knurling
Includes heat-set tips
This kit leads our list with a high 4.7 rating and comprehensive contents. It offers 600 pieces across six metric sizes along with necessary heat-set tips. The lead-free brass construction ensures durability and reliability for various 3D printing applications.
Pros
- Comprehensive 3D printing kit
- Strong torque resistance
- Organized storage case
- Works with common thermoplastics
- Excellent corrosion resistance
Cons
- Soldering iron not included
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The standout quality is the 45-degree spiral knurling which provides superior pull-out strength. This design prevents stripping even after repeated assembly and disassembly cycles. It works well with PLA PETG ABS and other thermoplastics making it versatile for different projects.
While the kit is excellent it does not include a soldering iron. You must provide your own heating tool which is a minor inconvenience. However the included adapter and tips make setup straightforward for most users starting out with inserts.
Ideal for makers and hobbyists needing a complete solution for threading plastic parts. This kit provides everything needed for strong reliable threads without separate purchases. We recommend it for anyone looking for quality and value in a single package.
Superior Torque Resistance
The spiral knurling design bites into plastic for a secure hold that resists rotation under load.
Complete Kit Convenience
Everything from tips to storage is included saving time and effort for immediate project use.
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2. 400Pcs Metric Heat Set Insert – Best Value Brass Threaded Inserts
400Pcs Metric Heat Set Insert
400 pieces total
M2 to M6 sizes
High-precision threading
Temperature resistant
With a 4.8 rating this kit offers a substantial 400 pieces across standard metric sizes. It is crafted from top-tier brass ensuring high thermal conductivity and resistance to corrosion. The precision craftsmanship delivers clear threads that prevent slippage during use.
Pros
- Large quantity for bulk projects
- High thermal conductivity
- Clear threading prevents slippage
- No countersinking required
- Versatile application range
Cons
- No storage case included
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The 45-degree angled knurling significantly enhances torque resistance for stronger fastening. Embedded guide elements eliminate the need for countersinking or recessing holes which simplifies installation. It withstands temperatures exceeding 300 degrees Celsius making it robust for heat setting.
While it lacks a storage case the high quality and quantity compensate for this oversight. Users need to organize the pieces themselves which may take extra time after opening. The durable construction ensures long-term reliability regardless of how you store them.
This is an excellent choice for projects requiring a large volume of inserts without premium costs. It suits prototypers or production runs where consistent performance is key. We recommend it for those prioritizing quantity and material quality over convenience accessories.
High Thermal Conductivity
The brass material transfers heat efficiently allowing for quick and uniform installation into plastic parts.
Installation Efficiency
Guiding elements simplify the process by removing the need for additional prep work on the plastic.
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3. KADRICK M2-M5 Heat Set Insert Kit – Best Organization Brass Threaded Inserts
KADRICK M2-M5 Heat Set Insert Kit
520 pieces total
M2 to M5 sizes
3mm to 12mm height
Independent compartments
Kadrick provides a solid kit with 520 pieces focusing on the most common 3D printing sizes from M2 to M5. The plastic box features detailed labels with key data making it easy to identify sizes quickly. It also includes a generous 24-month warranty service.
Pros
- Detailed labeling on box
- 24-month warranty
- Strong gripping strength
- Clear independent compartments
- High corrosion resistance
Cons
- Limited to M2-M5 range
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The brass inserts undergo precision processing to ensure excellent heat conduction and corrosion resistance. Knurled threading provides stronger gripping strength and can withstand high tensile force compared to straight versions. Independent compartments keep the pieces separated for better organization.
The limitation is the height range which stops at M5 so you may need other sizes for larger projects. However the included lengths from 3mm to 12mm cover most standard functional needs. The warranty adds significant peace of mind for long-term use.
This kit is best for general hobbyists who need reliable standard sizes with organized storage. The labeling and warranty reflect a strong brand guarantee. We recommend it for those who value clear organization and long-term support in their hardware purchases.
Clear Labeling System
Detailed annotations on compartments help users find the right size quickly without guesswork or confusion.
Brand Warranty Support
The 24-month after-sales service provides confidence that any issues will be handled by the manufacturer.
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4. 1/4"-20 Threaded Insert for Hard-Wood – Best For Furniture Brass Threaded Inserts
1/4"-20 Threaded Insert for Hard-Wood
1/4-20 thread
0.5 inch length
Solid brass material
Knife-thread design
These inserts are designed specifically for hardwood applications with a reliable knife-thread solid brass construction. They provide a stronger secure connection compared to screwing directly into wood which reduces risk of stripping. The solid brass material ensures durability for repeated use.
Pros
- Stronger than direct screwing
- Supports heavier loads
- Ideal for hardwood furniture
- Durable brass material
- Secure wood connection
Cons
- Small pack size only 25
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The inserts are ideal for furniture fixtures where frequent assembly occurs. They support heavier loads and stresses without compromising the wood integrity. This makes them perfect for cabinets tables and other hardwood projects requiring robust fastening solutions.
The pack size is limited to 25 pieces which may not suffice for large projects. However for small repair jobs or limited furniture assembly it is adequate. The quality ensures that you get the most out of each individual insert.
This is a top pick for woodworking projects involving hardwoods that need metal threading. The knife threads slice cleanly into the wood for a permanent connection. We recommend it for anyone looking to reinforce furniture or fixtures without compromising on strength.
Hardwood Optimized
The knife-thread design allows for optimal holding power in dense wood materials without pre-tapping.
Load Bearing Capacity
These inserts support heavier loads and stresses preventing wood splitting during repeated fastening.
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5. E-Z LOK Thread Insert for Hard Wood – Best For Easy Install Brass Threaded Inserts
E-Z LOK Thread Insert for Hard Wood
0.25-20 thread
0.75 inch length
Screwdriver install
Hard wood use
E-Z LOK is a trusted brand known for making strong threads easy to create in wood. This insert installs easily with a screwdriver bolt jam nut or optional drive tool. It features a 0.25-20 thread size with a 0.75 inch length for solid engagement.
Pros
- Easy screwdriver installation
- Strong threads made easy
- Optional drive tool available
- 0.75 inch length
- Reliable brand
Cons
- Very small pack size 10
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The primary benefit is the ease of installation which simplifies the process for DIY enthusiasts. You do not need specialized equipment to get a secure hold. The brand reputation ensures the product meets high standards for reliability and performance.
The pack only contains 10 pieces which is very small compared to other options. This makes it suitable only for tiny projects or single repairs rather than bulk usage. The quality is high but the quantity limits its utility for larger tasks.
Choose this if you need a few inserts for a specific repair or DIY project. The brand reliability and ease of install are strong selling points. We recommend it for small-scale projects where quality matters more than quantity.
Simple Installation
Installation requires only a standard screwdriver or common hardware which speeds up the process.
Brand Reliability
E-Z LOK has a strong reputation for durable fasteners that perform consistently over time.
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6. 513Pcs SAE Threaded Inserts – Best SAE Options Brass Threaded Inserts
513Pcs SAE Threaded Inserts
SAE thread sizes
513 pieces total
Includes heat-set tips
45-degree knurling
This kit stands out by offering a comprehensive range of SAE thread sizes like #2-56 and #6-32. It includes over 500 pieces which is ideal for large projects requiring multiple connections. The brass material ensures durability and resistance to corrosion and breakage.
Pros
- Includes SAE thread sizes
- Large quantity for projects
- High-quality brass material
- Strong torque resistance
- Compatible with thermoplastics
Cons
- Fewer metric options included
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The 45-degree angled knurling enhances torque resistance and tensile strength significantly. High-precision threading prevents slippage ensuring stable reliable connections for electronics or printing. The package also includes heat-set tips which helps you start using it immediately.
While it excels in SAE sizes it lacks metric options that many 3D printers rely on. This makes it best suited for US customary hardware projects rather than universal ones. The quantity and quality are excellent for those who specifically need these thread standards.
It is a great choice for those working with American-standard screws and bolts in plastic. The high quantity ensures you have enough parts for bulk repairs. We recommend it for anyone prioritizing SAE compatibility in their hardware assortment.
SAE Compatibility
This kit covers essential SAE thread sizes often used in American electronics and hardware assemblies.
Comprehensive Accessories
Included heat-set tips make it ready to use without needing to buy additional accessories.
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7. 607Pcs Threaded Inserts for Plastic – Best Quantity Brass Threaded Inserts
607Pcs Threaded Inserts for Plastic
607 pieces total
M2 to M6 sizes
Includes heat tool
Universal compatibility
This kit offers an impressive 607 pieces ensuring you have plenty of inserts for large scale use. It covers all standard M2 to M6 sizes and includes an upgraded heat insert tool with tips. The premium brass delivers exceptional thermal conductivity and corrosion resistance.
Pros
- High piece count
- Includes heat insert tool
- Spiral knurling design
- Universal thermoplastic fit
- Rigorously inspected
Cons
- Tool not complete with iron
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The spiral knurling gives better torque and pull-out strength than straight designs. Installation is simple with a soldering iron allowing you to press inserts flush quickly. They work with all common thermoplastics making them versatile for electronics or casings.
The tool is included but does not come with the soldering iron itself. This means you must still provide your own heating source for installation. However the tool tips are upgraded and compatible with standard irons for ease of use.
It is ideal for those needing a massive quantity of reliable inserts for prototyping or production. The universal fit ensures it works for nearly any 3D printing project. We recommend it for anyone prioritizing volume and versatility in their purchase.
Universal Compatibility
Designed to work with all major thermoplastics ensuring reliable performance in any common material.
Upgraded Heat Tool
The included tool tips simplify installation by allowing precise control over heat application.
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8. Threaded Inserts for Wood Installation Kit – Best Complete Set Brass Threaded Inserts
Threaded Inserts for Wood, Installation Kit, Brass
All-in-one kit
Includes drill bit
Solid brass inserts
10 pieces included
This all-in-one kit delivers everything needed to install inserts without extra purchases. It includes a matching drill bit and dedicated installation tool making the process fast. The solid brass construction ensures a long-lasting rust-free hold in all wood types.
Pros
- Includes matching drill bit
- Includes installation tool
- Perfect for DIY
- Rust-free hold
- Weather-resistant
Cons
- Very small insert count
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The strong external threads lock securely into wood creating a permanent connection that resists pull-out. This makes it ideal for furniture assembly cabinetry or marine projects due to weather resistance. It is designed for both pros and DIY enthusiasts equally.
The insert count is limited to 10 pieces which may restrict bulk usage significantly. However for small repairs the included tools add immense value. The convenience of having the bit and tool included outweighs the low quantity for many users.
This is the perfect premium set for someone needing a quick solution for wood projects. The complete kit removes the need for separate tool hunting. We recommend it for those prioritizing convenience and quality over sheer volume.
Complete Kit Value
The included drill and tool eliminate the need to search for matching accessories separately.
Weather Resistance
Brass material provides excellent corrosion resistance for marine or outdoor wood applications.
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9. 350Pcs Threaded Inserts – Best Value Brass Threaded Inserts
350Pcs Threaded Inserts
350 pieces total
12 essential sizes
Anti-corrosion brass
Transparent storage box
With a 4.9 rating this kit offers exceptional value with 350 pieces covering twelve essential sizes. It is crafted from high-quality brass with excellent anti-corrosion performance for longevity. The transparent storage box organizes everything by size for quick access.
Pros
- Highly rated kit
- Anti-corrosion performance
- 12 size variations
- Transparent storage box
- Spiral knurling
Cons
- Soldering iron not included
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The 45-degree helical knurling design increases friction for stable durable fastening. It works specifically with all thermoplastics ensuring strong functional models and casings. The kit is engineered to meet daily needs for electronics and hardware assembly.
You must provide your own soldering iron or welder to install the inserts. This is standard for most kits but it is a minor point to note. Despite this the high rating and variety of sizes make it an attractive budget option.
This kit is a top budget pick for makers needing a range of sizes for different projects. The clear organization and high quality ensure reliability. We recommend it for anyone seeking a low cost high performance solution.
Highly Rated
The 4.9 user rating reflects widespread satisfaction with the product performance and value.
Variety of Sizes
Twelve essential sizes provide flexibility for diverse applications without needing multiple kits.
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10. Taytools 25 Pieces – Best For Woodworking Brass Threaded Inserts
Taytools 25 Pieces 1/4-20 Threaded Inserts
1/4-20 thread
Solid brass material
Wood and composites
Knife thread design
Taytools offers a reliable woodworking kit with solid brass inserts designed for various wood types. The knife threads slice into wood providing optimal holding power for machine screws. They are ideal for furniture where frequent assembly occurs without thread stripping.
Pros
- Knife threads for optimal hold
- Solid brass material
- Easy T-wrench install
- Ideal for knockdown furniture
- Corrosion protection
Cons
- Small quantity limited
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The external knife thread design is specific to wood applications unlike plastic heat sets. You can install them easily using a T-wrench or dedicated drive tool. The solid brass protects against corrosion ensuring a long life in furniture fixtures.
The pack contains only 25 pieces which limits large-scale use significantly. However for small repairs this quantity is perfectly adequate. The brand ensures quality and precision for professional results in woodworking projects.
This is a great pick for woodworkers needing durable inserts for knockdown furniture. The design ensures a permanent connection that withstands repeated use. We recommend it for those prioritizing specialized woodworking quality over bulk count.
Knockdown Furniture Ready
These inserts are designed to handle the stress of frequent assembly in furniture pieces.
Specialized Wood Threads
The knife thread design is specific to wood providing superior grip compared to general threads.
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Buying Guide – How to Choose the Best Brass Threaded Inserts
Choosing the right brass threaded inserts requires understanding thread types and compatibility. This section covers the key factors to consider before making a purchase for your project needs.
Thread Type and Size
Thread types vary between metric sizes like M2 M3 and SAE sizes like #4-40. Ensure the kit includes the sizes you need for your screws or bolts. Mixing systems can cause fit issues.
Check the thread size carefully against your project hardware to ensure a perfect match.
Material Quality
Look for high-quality lead-free brass which offers excellent thermal conductivity and corrosion resistance. This ensures the inserts can withstand heat without deformation. Quality brass also resists wear over time.
Select products made from premium brass to guarantee long-lasting performance and reliability.
Knurling Design
45-degree spiral knurling provides better torque resistance than straight threads. This helps the insert bite firmly into plastic or wood for a secure hold. It prevents rotation under load during use.
Prioritize spiral knurling for stronger holding power and reduced risk of loosening.
Heat Resistance
Inserts for 3D printing must withstand heat from a soldering iron up to 300 degrees C. Ensure the product specifies temperature resistance to avoid melting during installation. This is vital for a secure permanent bond.
Choose heat-resistant inserts to ensure they do not deform during the installation process.
Included Tools
Some kits include heat-set tips or installation tools to simplify the process. Others may require you to buy these separately. Check what is included to avoid extra costs.
Look for kits with included tips to save money and reduce preparation time.
Storage Organization
A storage case with labeled compartments makes it easy to find the right size quickly. This helps prevent mixing different sizes which can ruin projects. Transparent boxes are also useful.
Select options with organized storage to maintain order and efficiency in your workshop.
Quantity and Pack Size
Consider how many inserts you need for your current and future projects. Large counts are good for bulk use while small packs work for repairs. Ensure the quantity meets your requirements.
Match the pack size to your project volume to avoid shortages or unnecessary excess.
Compatibility with Materials
Ensure the insert works with your specific material such as PLA ABS PETG or wood. Different designs suit different applications like heat setting vs knife threading. Check the description for compatibility.
Verify material compatibility to ensure the insert will adhere correctly without damage.
How to Use and Care for Your Brass Threaded Inserts
Heat the tip of a soldering iron to the recommended temperature for your plastic type. Press the insert into the pre-drilled hole until it sits flush. Allow it to cool before removing the heat.
Store the inserts in a dry place to prevent oxidation. Use the provided compartments or labels to keep them organized. Proper storage extends their life.
For wood use a matching drill bit to create a pilot hole. Screw the insert in slowly to avoid stripping. The knife threads will cut into the wood effectively.
Frequently Asked Questions
What is a brass threaded insert used for?
Brass threaded inserts are used to create durable metal threads inside plastic or wood parts. They allow you to use standard machine screws safely without stripping the material. They are essential for electronics enclosures and furniture assembly.
How do I install a heat set insert?
You install a heat set insert by heating it with a soldering iron. Place the tip on the insert and press it into the plastic hole. Let it cool completely to bond securely.
Are these inserts reusable?
Yes, many brass threaded inserts are reusable as long as they are not damaged during installation. The metal threads remain durable even after repeated use. Careful installation ensures they last for multiple cycles.
Do I need a special drill bit?
Yes, you should use a drill bit sized specifically for the insert diameter. Using the wrong size can result in a loose or damaged hole. Check the package for recommended hole sizes.
Can I use these in ABS plastic?
Yes, these inserts are designed to work with common thermoplastics including ABS. The material withstands the heat needed for installation. Ensure your insert is rated for ABS temperatures.
What is spiral knurling?
Spiral knurling is a groove pattern that helps the insert grip the plastic or wood. It provides better resistance to rotation and pull-out forces. This ensures a stronger hold than smooth threads.
How do I remove a stuck insert?
You can remove a stuck insert by heating it again to melt the surrounding plastic. Use pliers to pull it out carefully. Avoid applying too much force to prevent breaking the plastic.
Which size is most common for 3D printing?
The M3 size is very common for 3D printing frames and electronics. M2 and M4 are also frequently used. A kit with multiple sizes covers most general project needs.
Final Thoughts on Choosing the Best Brass Threaded Inserts
We reviewed ten top picks including the 600+7Pcs kit for overall quality and the 350Pcs set for budget value. Each option brings unique strengths like tool inclusion or specialized wood threading.
Prioritize compatibility and material quality for your specific needs to ensure reliability. A complete kit with organized storage helps streamline your workflow for future projects.
Always check current availability and specs before buying as these details can change. The options listed provide a solid starting point for your hardware needs.