350Pcs Threaded Inserts, M2-M6 Heat Set Inserts for 3D Printing
4.9Editor score
Affordable price point
High precision threading
Spiral knurling design
10 Best Brass Threaded Inserts (October 2026) Expert Guide
Brass threaded inserts provide reliable, durable threads in plastic and wood. They prevent stripping and allow repeated assembly without damage. Choosing the right insert depends on material compatibility and thread size.
We compared ten leading products based on thread precision, corrosion resistance, and ease of installation. Our analysis covers metric and SAE kits as well as wood-specific options for diverse applications.
Each pick highlights key features like knurling design and packaging quality. Prices and availability change frequently, so verify current details before purchasing to ensure you get the best value for your needs.
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
Lead-free brass construction
Includes heat-set tools
Organized storage case
Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4"-20 Knife Thread Inserts (10pcs), Drill, Installation Tool
5.0Editor score
Complete installation kit
Solid brass durability
Includes drill bit
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Top 10 Best Brass Threaded Inserts in 2026 Compared
This table provides a side-by-side overview of the top ten brass threaded inserts available today. Review each product’s specifications, ratings, and unique features to identify the best fit for your specific project requirements.
ProductsSpecificationsEditor scorePrice
Editor's Choice
600+7Pcs Brass Threaded Inserts M2 M2.5 M3 M4 M5 M6 for 3D Printing
M2 to M6 sizes
Lead-free brass material
Includes 6 heat-set tips
Organized storage case
4.7Editor score
Editor's Choice
400Pcs Metric Heat Set Insert, M2 M2.5 M3 M4 M5 M6 Female Thread Knurled Nuts Assortment Kit
400 pieces total
High thermal conductivity
45-degree angled knurling
Works with all plastics
4.8Editor score
Best Premium
KADRICK M2-M5 Heat Set Insert Kit,520PCS Thread Inserts for 3D Printing
M2 to M5 sizes
3mm to 12mm heights
Clear compartment labeling
24-month warranty
4.8Editor score
1/4"-20 Threaded Insert for Hard-Wood, Brass Knife Thread Inserts, 1/4"-20 Internal Threads, 0.5" Length
1/4-20 thread
Hardwood specific
0.5 inch length
25 pieces included
4.7Editor score
E-Z LOK Thread Insert for Hard Wood, 0.25-20, 0.75 in, 10 ct
1/4-20 thread
0.75 inch length
Easy installation
10 pieces included
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
SAE thread sizes
513 pieces total
Heat set installation
Corrosion resistant
4.6Editor score
607Pcs Threaded Inserts for Plastic, Heat Set Inserts M2/2.5/3/4/5/6
M2 to M6 sizes
607 pieces included
Upgraded heat tool
Universal fit
4.6Editor score
Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4"-20 Knife Thread Inserts (10pcs), Drill, Installation Tool
Includes drill bit
1/4-20 thread
Solid brass material
Easy for DIY
5.0Editor score
350Pcs Threaded Inserts, M2-M6 Heat Set Inserts for 3D Printing
350 pieces total
M2 to M6 sizes
Anti-corrosion brass
Transparent storage box
4.9Editor score
Taytools 25 Pieces 1/4-20 Threaded Inserts Solid Brass for Hardwoods, Softwoods, Plywood and Composites Knife Threads
25 pieces included
Knife thread design
Hard and soft wood
Solid brass body
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
Includes soldering adapter
Labeled storage case
This comprehensive kit offers 600 lead-free brass inserts across six common metric sizes. It holds a solid rating due to its inclusion of heat-set tips and a soldering adapter. The precision threading and knurling ensure reliable performance in thermoplastics.
Pros
- Comprehensive kit with all tools
- High thermal conductivity
- Strong spiral knurling
- Organized compartments
- Corrosion resistant
Cons
- Iron not included
- Case size is large
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The lead-free brass construction provides excellent thermal conductivity, allowing for quick installation. Spiral knurling delivers high torque resistance compared to straight threads. Each size has its own labeled compartment, making organization easy for makers.
While the kit is thorough, it does not include a soldering iron itself. You will need to use your own iron with the provided adapter. The case is sturdy but may take up significant space in a toolbox.
Ideal for 3D printing enthusiasts who need a one-stop shop for threaded inserts. If you value organization and tool inclusion over minimal packaging, this kit is a top recommendation.
Complete Tooling Included
Having six heat-set tips and an adapter means you can start working immediately without buying extra tools.
Premium Material Quality
Lead-free brass offers better corrosion resistance and conductivity, ensuring inserts last longer in demanding applications.
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2. 400Pcs Metric Heat Set Insert – Reliable Brass Threaded Inserts
400Pcs Metric Heat Set Insert, M2 M2.5 M3 M4 M5 M6 Female Thread Knurled Nuts Assortment Kit
400 pieces
M2 to M6 sizes
45-degree knurling
High precision threading
This kit focuses on quantity and quality with 400 metric inserts. It earns high ratings for consistent threading that prevents slippage during installation. The brass resists deformation even under high thermal stress.
Pros
- Large quantity for bulk projects
- Clear and precise threads
- Withstands high heat
- Durable brass material
- Universal plastic compatibility
Cons
- No tools included
- Packaging varies
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The 45-degree angled knurling enhances pull-out strength significantly. Users appreciate that these inserts work with injection-molded parts as well as 3D prints. The clear threading makes alignment easier during heat-setting.
A downside is the lack of heat-set tools or tips. You must source these separately. Additionally, packaging might differ from photos, so verify contents upon arrival.
Best for those who need bulk inserts for repetitive production runs. If you already have heat-setting tools, this kit offers excellent value per piece.
High Temperature Resistance
The brass withstands temperatures over 300 degrees Celsius, making it ideal for high-heat plastic processes.
Secure Grip
Precision knurling ensures the insert locks firmly into place, reducing the risk of rotation under load.
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3. KADRICK M2-M5 Heat Set Insert Kit – Durable Brass Threaded Inserts
KADRICK M2-M5 Heat Set Insert Kit,520PCS Thread Inserts for 3D Printing
520 pieces total
M2 to M5 sizes
Varied heights
Brass construction
Kadrick provides a robust kit with 520 inserts covering common sizes. Heights range from 3mm to 12mm, offering versatility for different plastic thicknesses. The brand offers a 24-month warranty, adding confidence to the purchase.
Pros
- Detailed labeling on box
- Variety of lengths
- Strong tensile strength
- Corrosion resistant
- Brand warranty included
Cons
- Limited to M2-M5
- No tools included
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Precision processing ensures excellent heat conduction and stability. Knurled threads provide stronger gripping than straight threads. The clear labeling on each compartment helps quickly identify the right size.
It does not include M6 sizes, which might limit compatibility for larger screws. You will also need your own soldering iron. The warranty is a strong positive but does not cover misuse.
Choose this if you need varied lengths for diverse projects and want the security of a warranty. It is a solid choice for general prototyping and repair work.
Warranty Support
A 24-month after-sales warranty provides peace of mind for users concerned about long-term durability.
Height Variety
Different heights allow you to match insert length to part thickness, improving thread engagement.
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4. 1/4"-20 Hardwood Inserts – Wood Threaded Inserts
1/4"-20 Threaded Insert for Hard-Wood, Brass Knife Thread Inserts, 1/4"-20 Internal Threads, 0.5" Length
1/4-20 thread
Knife thread design
Hardwood specific
Solid brass
These inserts are specialized for hardwood applications like cabinets and furniture. The knife threads are designed to slice into wood fibers for a secure fit. Brass material ensures the insert will not rust over time.
Pros
- Strong connection in wood
- Knife threads cut cleanly
- Corrosion resistant
- Ideal for furniture
- Long thread life
Cons
- Wood use only
- Small pack size
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Users find these inserts support heavier loads without stripping the wood. They are perfect for knockdown furniture that requires frequent disassembly. The internal threads are precise for standard machine screws.
They are limited to 0.5 inch length and specific wood types. Softwoods may require pilot holes. The pack of 25 is small for large projects, requiring multiple orders.
Best for woodworkers needing reliable threaded holes in solid wood. If you need to assemble furniture or fixtures, these provide a professional solution.
Knife Thread Design
External knife threads cut into the wood grain, maximizing pull-out strength in dense materials.
Furniture Applications
Ideal for cabinets and drawers where strong, reusable threads are essential for longevity.
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5. E-Z LOK Thread Insert – Easy Install Brass Threaded Inserts
E-Z LOK Thread Insert for Hard Wood, 0.25-20, 0.75 in, 10 ct
1/4-20 thread
0.75 inch length
Easy installation
Tool compatible
E-Z LOK offers a straightforward solution for hard wood applications. You can install these using a screwdriver, bolt, or drive tool. They are known for strong, clean threads that resist wear.
Pros
- Simple to install
- Multiple install methods
- Reliable thread strength
- Brass material
- Standard size
Cons
- Limited count
- No drill bit included
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The 0.75 inch length provides substantial engagement in wood. Users appreciate the flexibility of installation tools. The brass material ensures resistance to corrosion in various environments.
This pack contains only ten pieces, which is small for bulk work. You must provide your own pilot holes and driving tool. The brand is well-known but specific tool requirements may add cost.
Choose this for small furniture repair projects. If you need a standard insert with proven reliability and flexible installation, it is a solid pick.
Flexible Installation
Multiple methods allow you to install these inserts with whatever tools you currently have.
Standard Sizing
The 1/4-20 thread is a common standard, making it easy to find compatible screws.
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6. 513Pcs SAE Threaded Inserts – SAE Brass Threaded Inserts
513Pcs SAE Threaded Inserts, #2-56#4-40#6-32#8-32#10-32 1/4"-20 Female Thread Knurled Nuts Assortment Kit
SAE thread sizes
513 pieces
Includes 7 tips
Universal plastic fit
This kit covers essential SAE sizes for those working with imperial screws. It includes over 500 pieces and heat-set tips. Precision threading ensures stability and prevents slippage during rotation.
Pros
- SAE thread options
- Large assortment
- High quality brass
- Heat-resistant
- Organized kit
Cons
- Fewer pieces per size
- Tips may wear
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The knurling design improves pull-out strength in plastics. Brass material withstands high heat without deformation. It is suitable for both heat-setting and injection molding applications.
The distribution of pieces across sizes might leave some sizes low on stock. You will still need a soldering iron. The tips provided might need replacement over time.
Best for projects requiring imperial threads in plastic components. If you work with US standard screws, this kit provides the right thread profiles.
SAE Thread Coverage
Covers all common SAE sizes from #2 to 1/4 inch, ensuring compatibility with US screws.
Thermal Stability
High-quality brass maintains integrity under heat, preventing warping during installation.
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7. 607Pcs Threaded Inserts for Plastic – Value Brass Threaded Inserts
607Pcs Threaded Inserts for Plastic, Heat Set Inserts M2/2.5/3/4/5/6
607 pieces total
M2 to M6 sizes
Upgraded heat tool
Precision threads
This kit offers excellent value with 607 inserts covering standard metric sizes. It includes an upgraded heat insert tool with six tips. The brass is resistant to corrosion and cracking.
Pros
- Very affordable price
- Includes heat insert tool
- Universal compatibility
- Strong pull-out strength
- Organized storage
Cons
- Basic packaging
- Tool quality varies
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Spiral knurling helps bites into plastic for a secure hold. Users find it works well with PLA, ABS, and other thermoplastics. The storage box prevents loss and keeps sizes separated.
While the price is low, the included tool might be basic. It works well for light use but may wear faster than separate tools. Iron not included means you must use your own.
Great for hobbyists on a budget who want everything in one box. If cost is a priority, this kit delivers a lot of inserts for the money.
Value Pricing
At a low price point, this kit offers one of the best values per piece on the market.
Comprehensive Tooling
The included tool set means you can start working right away without extra purchases.
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8. Threaded Inserts for Wood Installation Kit – Complete Wood Threaded Inserts
Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4"-20 Knife Thread Inserts (10pcs), Drill, Installation Tool
Complete kit
Drill included
Installation tool
Solid brass
This is a premium installation kit designed for seamless setup. It includes the drill bit and tool required for 1/4-20 inserts. The brass is solid and corrosion resistant for durable holds.
Pros
- All-in-one solution
- Perfect drilling size
- Superior hold
- Corrosion resistant
- Weather resistant
Cons
- Higher price
- Small insert count
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Users report that the external threads lock securely to resist vibration. It is ideal for marine projects or outdoor furniture due to weather resistance. The included tools ensure precise holes every time.
The price is higher than loose inserts. You get only ten inserts, which is enough for small projects. It is best for those who want a guaranteed fit without guessing drill sizes.
Choose this for high-quality woodworking results. If you want the best hold and tools included, this kit justifies the extra cost.
Precise Drilling
The included drill bit ensures the hole size is perfectly matched to the insert.
Weather Resistance
Solid brass resists rust, making these inserts suitable for marine or outdoor use.
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9. 350Pcs Threaded Inserts – Budget Brass Threaded Inserts
350Pcs Threaded Inserts, M2-M6 Heat Set Inserts for 3D Printing
350 pieces
M2 to M6 sizes
Transparent storage
45-degree knurl
This kit combines affordability with high ratings. It offers a complete set of metric sizes. The 45-degree helical knurling increases friction for stable fastening in plastics.
Pros
- Affordable
- High rated
- Organized box
- Anti-corrosion brass
- Strong torque resistance
Cons
- Basic tool needs
- Iron not included
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Brass quality is excellent with high corrosion resistance. The transparent box allows you to see contents at a glance. It works well for electronics, automotive cases, and general repairs.
It lacks dedicated heat-set tools. You must use your own soldering iron. The packaging is simple but effective for keeping parts separate.
Best for budget-conscious makers needing reliable threads. If you already have tools, this kit offers excellent value and performance.
High Torque Resistance
The spiral knurling significantly improves pull-out strength compared to standard straight threads.
Storage Clarity
Transparent storage boxes make it easy to monitor stock levels and organize efficiently.
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10. Taytools Solid Brass Inserts – Wood Threaded Inserts
Taytools 25 Pieces 1/4-20 Threaded Inserts Solid Brass for Hardwoods, Softwoods, Plywood and Composites Knife Threads
25 pieces
Solid brass
Knife thread
Universal wood
Taytools provides a trusted option for wood inserts. These work on hardwoods, softwoods, and composites. The knife threads slice cleanly for optimal holding power and easy installation.
Pros
- Works on all woods
- Knives into wood
- Solid brass body
- Corrosion resistant
- Strong holding power
Cons
- Specific pilot hole needs
- Slightly higher price
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The solid brass construction ensures durability. Pilot hole sizes differ by wood type. You may need to test on scrap first. This prevents splitting and ensures proper insertion.
A T-wrench or bolt can be used for installation. The length and thread pitch are standard for furniture. It may cost more per piece than bulk kits.
Best for carpenters who need versatility across wood types. If you want a reliable insert that works on any wood, this is a top choice.
Universal Wood Fit
Designed for both soft and hard woods, making it a versatile tool for diverse woodworkers.
Pilot Hole Guidance
Includes specific pilot hole sizes to ensure clean installation without splitting the wood.
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Buying Guide – How to Choose the Best Brass Threaded Inserts
Selecting the right brass threaded insert depends on your material, thread size, and installation method. This guide outlines key factors to help you make an informed decision for your project.
Material Compatibility
Brass inserts are designed for thermoplastics like PLA and ABS or solid wood. Ensure the insert type matches your substrate. Heat-set inserts work best in plastic while knife-thread ones work in wood.
Choose the insert material and thread design that aligns with the base material to prevent stripping or cracking.
Thread Size and Type
Decide between metric and SAE systems based on your screws. Common metric sizes range from M2 to M6. SAE sizes vary from #2 to 1/4 inch. Matching the thread is critical for function.
Always verify your screw size and match it exactly to the insert’s internal thread specification.
Length and Diameter
The length of the insert should match the thickness of your plastic or wood part. Longer inserts provide better pull-out strength but require deeper holes. Diameter must fit the hole size precisely.
Select a length that ensures full thread engagement without protruding beyond the surface.
Installation Method
Most plastic inserts require heat from a soldering iron. Wood inserts often use a press or screw-in tool. Check what tools are included or needed separately to avoid extra costs.
Ensure you have the right tools like soldering irons or installation drivers before buying.
Knurling Design
Spiral knurling provides better torque resistance than straight knurling. It grips the material more firmly during rotation. Look for 45-degree angled designs for maximum pull-out strength.
Opt for spiral knurling to ensure the insert stays fixed under load.
Packaging and Organization
Inserts come in bulk or kits with organized cases. Labeled compartments make finding sizes faster. A storage case helps prevent loss and keeps hardware clean.
Choose a kit with clear organization to save time during assembly and maintenance.
Corrosion Resistance
Brass is naturally corrosion resistant, but quality varies. Lead-free brass offers better longevity and conductivity. For marine or humid environments, verify the material specification.
High-quality brass resists rust and oxidation for long-term reliability in various conditions.
Quantity and Value
Kits range from 10 pieces to over 500. Bulk kits offer better value per insert. Ensure the quantity matches your project needs to avoid frequent reordering.
Buy enough inserts to complete your project with spares for future repairs.
How to Use and Care for Your Brass Threaded Inserts
For plastic parts, drill a hole matching the insert diameter. Heat the insert with a soldering iron until soft, then press it flush into the hole. Allow it to cool fully before threading.
For wood, drill a pilot hole using the recommended size for the wood type. Use a drive tool to screw the insert into the hole until flush. Apply firm pressure to ensure a tight fit.
Store inserts in a dry, organized container to prevent loss and rust. Clean tools after use to ensure proper heat transfer. Always inspect inserts for damage before installation to ensure safety.
Frequently Asked Questions
What is the best way to install brass inserts in 3D printed parts?
Heat the insert with a soldering iron until it softens. Press it into the hole and hold it flush. Let it cool completely before applying a screw to ensure a tight bond.
Can brass inserts be used in all plastics?
They work well with most thermoplastics like PLA, PETG, and ABS. Avoid brittle plastics that may crack under heat. Always test on a scrap piece first for best results.
Why do inserts spin when I tighten a screw?
This usually means the hole is too large or the knurling didn’t bite into the material. Try a larger insert or ensure you heated it enough to melt slightly into the plastic.
Are metric and SAE inserts interchangeable?
No, metric and SAE threads have different pitches. Using the wrong type will damage your screw and part. Always match the thread system to your hardware needs.
How do I choose the right length for my insert?
The length should match the thickness of your material. Longer inserts provide better strength but require deeper holes. Check your project specs to pick the right size.
Do brass inserts rust easily?
Brass is corrosion resistant and rarely rusts. However, low-quality brass may oxidize. Choose lead-free, high-quality inserts for better durability and longevity.
What tools do I need to install wood inserts?
You need a drill bit matching the insert diameter and a T-wrench or installation tool. Ensure the pilot hole is clean to allow smooth insertion.
Can I reuse brass threaded inserts?
Yes, heat-set inserts can often be removed and reused. Use a drill or pliers to back them out gently. Check the threads for wear before reusing.
Final Thoughts on Choosing the Best Brass Threaded Inserts
We reviewed ten excellent brass inserts for plastic and wood. The top pick is the 600+7Pcs kit for its tool inclusion and quality. The budget option remains the 350Pcs kit for value.
Prioritize thread size accuracy and material compatibility for your project. Ensure you have the right tools like irons or drivers. This ensures installation is smooth and results are strong.
Prices fluctuate frequently so check current offers before buying. Verify stock levels and return policies for peace of mind. With the right insert, your builds will last longer.