What thread size and standard does this fitting nut use?

This FFVRVSS kit contains M4x6x5.5mm threaded inserts, which are metric. The M4 designation refers to the internal thread size. Ensure this metric size matches the screw or bolt you intend to use for a secure connection.

What material is this fitting nut made from?

These fitting nuts are made from premium lead-free brass, chosen for its excellent thermal conductivity, corrosion resistance, and strength. This material ensures clean, precise threads that resist stripping and deformation for reliable, long-term use in plastic applications.

How do I install these brass threaded inserts?

Installation requires a soldering iron. Heat the iron to 200-250°C for PLA or 350-400°C for PETG/ABS. Press the insert straight into a pre-drilled pilot hole (slightly smaller than 5mm) until flush, holding steady for 3-5 seconds while the plastic cools and locks it in place.

Are these brass inserts suitable for all 3D printing plastics?

Yes, these inserts are designed for universal compatibility with common thermoplastics including PLA, PETG, ABS, PPS, and PP. Their heat-set installation method works effectively across these materials, providing strong, reusable threads.

What is the pull-out strength of these inserts?

The 45-degree opposing spiral knurling on these inserts provides superior torque resistance and pull-out strength compared to straight-thread inserts. This design ensures they remain firmly seated in your 3D printed parts even under significant stress.

Can I use these inserts for metal-to-metal connections?

No, these threaded inserts are specifically designed for heat-setting into thermoplastics like PLA, PETG, and ABS. They create strong, reusable metal threads within plastic components, not for connecting metal parts directly.

How do I choose the right size nut insert for my project?

This kit provides the M4x6x5.5mm size, which is a popular choice for many 3D printing applications. For other projects, ensure you match the internal thread size (M4 in this case) to the screw or bolt you plan to use, and verify the outer diameter fits your pilot hole.

What are the benefits of using brass threaded inserts over just screwing into plastic?

Brass threaded inserts offer significantly stronger, more durable, and reusable threads compared to directly screwing into plastic. They prevent stripping, withstand higher torque, and resist wear from repeated assembly and disassembly, extending the life of your plastic components.

FFVRVSS M4 Brass Threaded Inserts 100 Pcs

Name: FFVRVSS M4x6x5.5 Brass Threaded Inserts Kit (100 Pcs) | Heat Set for 3D Printing
Brand: FFVRVSS
SKU: qcm0801
Price: 1205.00 INR
Availability: InStock

About this item

FFVRVSS M4x6x5.5 brass threaded inserts provide a robust solution for adding durable, reusable metal threads to your 3D printed projects and plastic components. This kit includes 100 lead-free brass inserts, designed for easy heat-set installation into thermoplastics like PLA, PETG, and ABS. The 45-degree spiral knurling ensures superior torque resistance and pull-out strength, making them ideal for electronics, furniture, and automotive applications.

Installation is straightforward: heat a soldering iron to the appropriate temperature (200-250°C for PLA, 350-400°C for PETG/ABS), press the insert into a pre-drilled pilot hole (slightly smaller than 5mm outer diameter), and hold for 3-5 seconds as the plastic cools and secures the insert. The built-in guide eliminates the need for countersinking, simplifying the process for makers and hobbyists.

These brass inserts offer excellent thermal conductivity and corrosion resistance, withstanding temperatures above 300°C. They are perfect for creating strong, removable threaded connections in electronics enclosures, circuit boards, toy assembly, and furniture repair. The kit comes in an organized, labeled compartment case for quick access to the M4 size, ensuring you have enough for multiple projects.

Key Features

3D PRINTING INSERT KIT — 100Pcs M4x6x5.5mm lead-free brass heat set threaded inserts in one organized labeled case. No more buying loose inserts separately - everything to add strong reusable metal threads to plastic 3D printed parts, ready to install.
PREMIUM LEAD-FREE BRASS — High-quality lead-free brass with excellent thermal conductivity and corrosion resistance. Withstands above 300°C/572°F. Clean, precise threads resist stripping, breaking, and deformation for reliable long-term use.
BUILT FOR MAKERS AND HOBBYISTS — Designed for 3D printing enthusiasts, prototypers, and DIY repair. Works with all thermoplastics including PLA, PETG, ABS, PPS, and PP. Ideal for electronics, toys, furniture, automotive casings, and laptop housings.
45-DEGREE SPIRAL KNURLING — Opposing spiral knurling delivers high torque resistance and pull-out strength vs straight inserts. No countersinking - heat with a soldering iron (not included) and press in for a firm, permanent hold.
ORGANIZED AND READY TO USE — 100pcs of the most popular M4 size in a labeled compartment for quick access. Compact sturdy case fits any toolbox. Backed by strict quality inspection and responsive customer support.

Why choose this product

Superior Thread Strength for 3D Prints

FFVRVSS M4 brass threaded inserts are engineered to solve the problem of weak, easily stripped screw holes in 3D printed parts. Unlike direct plastic threads, these inserts provide robust, reusable metal threads that withstand higher torque and repeated use. The 45-degree spiral knurling ensures maximum grip, preventing pull-out even in demanding applications. This means your 3D printed creations, from electronics enclosures to functional prototypes, will have reliable, long-lasting connections.

Ideal for Makers, Skip if...

Perfect for 3D printing enthusiasts, DIY repairers, and electronics hobbyists needing durable threaded connections in PLA, PETG, ABS, and other plastics. Skip if you require inserts for metal applications or if your project involves extreme vibration without proper locking mechanisms. Not suitable for direct use without a heat source like a soldering iron.

How to use

Print or drill a pilot hole slightly smaller than the insert's outer diameter (approx. 5mm for M4x6x5.5mm). Ensure the hole is clean and straight for optimal insert seating. — Prepare Pilot Hole
Heat your soldering iron to the appropriate temperature: 200-250°C for PLA, or 350-400°C for PETG/ABS and other higher-temperature plastics. Ensure the iron tip is clean. — Heat Soldering Iron
Align the insert with the pilot hole and press it straight down using the heated soldering iron tip. Apply steady pressure until the insert is flush with the plastic surface. — Press Insert into Hole
Hold the insert steady for 3-5 seconds while the surrounding plastic cools and solidifies. This allows the molten plastic to flow around the knurling, creating a strong, permanent bond. — Allow Plastic to Cool

Example scenarios

Typical situations where FFVRVSS M4x6x5.5 Brass Threaded Inserts Kit (100 Pcs) | Heat Set for 3D Printing helps — illustrative scenarios, not customer reviews.

Scenario 1

Illustrative example

Where it helps

A maker in Bangalore needs to assemble a custom 3D printed enclosure for an electronics project that requires frequent access for maintenance.

How this product helps

Using FFVRVSS M4 brass inserts ensures the enclosure's screw holes remain strong and reusable after multiple openings and closings, preventing stripped plastic threads and ensuring a secure fit for sensitive components.

Scenario 2

Illustrative example

Where it helps

A hobbyist in Delhi is repairing a plastic toy or furniture item that has stripped screw holes, needing a durable fix for reassembly.

How this product helps

Heat-setting these brass inserts into the damaged plastic provides a robust, permanent metal thread solution, allowing the item to be reassembled securely and withstand future use without further thread wear.

Specifications & installation

Specifications

Primary Material	Lead-Free Brass
Thread Type	Internal Metric Thread
Temperature Resistance	Above 300°C (572°F)

Installation & usage

Installation Method	Heat Set (Soldering Iron Required)
Recommended Pilot Hole Size	Slightly smaller than 5mm (insert OD)
Recommended Iron Temperature	200-250°C (PLA), 350-400°C (PETG/ABS)
Compatible Thermoplastics	PLA, PETG, ABS, PPS, PP
Cost per use	100 Pcs kit — ₹12.05 per insert

How we compare

Feature	FFVRVSS M4x6x5.5 Brass	Others
Material	Lead-Free Brass	Varies (Brass, Steel, Aluminum)
Thread Design	45° Spiral Knurling	Often Straight or Basic Knurling
Installation	Heat Set (Soldering Iron)	Heat Set or Screw-In (Varies)
Quantity	100 Pcs (M4x6x5.5mm)	Varies (often smaller packs or multi-size kits)
Cost per Insert	₹12.05 per insert	₹10 - ₹30 per insert (approx.)

SKU	qcm0801
Brand	FFVRVSS
Product Type	Nut Insert
Thread Size	M4x6x5.5mm
Quantity	100 Pcs
Material	Lead-Free Brass
Knurling Style	45-Degree Spiral
Color	Brass
Item Shape	Round
Finish Type	Brass
Country of Origin	Not stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners
Dimensions (Case)	2.6 x 2.6 x 0.65 inches (approx. 6.6 x 6.6 x 1.65 cm)

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FFVRVSS M4x6x5.5 Brass Threaded Inserts Kit (100 Pcs) | Heat Set for 3D Printing

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