---
product_id: 416136297
title: "221PCS Thread Knurled Brass Nuts, M2 M2.5 M3 M4 M5 M6 Insert Embedment Nuts Assortment Kit Female Knurled Threaded Insert Nuts for 3D Printing(6 Specifications)"
brand: "ruicaifu"
price: "$73.36"
currency: USD
in_stock: true
url: https://www.desertcart.ec/products/416136297-221pcs-thread-knurled-brass-nuts-m2-m2-5-m3-m4
store_origin: EC
region: Ecuador
---

# Heat-embed install ready 221 precision brass nuts 6 size specs M2-M6 221PCS Thread Knurled Brass Nuts, M2 M2.5 M3 M4 M5 M6 Insert Embedment Nuts Assortment Kit Female Knurled Threaded Insert Nuts for 3D Printing(6 Specifications)

**Brand:** ruicaifu
**Price:** $73.36
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your build game with precision brass power!

## Quick Answers

- **What is this?** 221PCS Thread Knurled Brass Nuts, M2 M2.5 M3 M4 M5 M6 Insert Embedment Nuts Assortment Kit Female Knurled Threaded Insert Nuts for 3D Printing(6 Specifications) by ruicaifu
- **How much does it cost?** $73.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/416136297-221pcs-thread-knurled-brass-nuts-m2-m2-5-m3-m4)

## Best For

- ruicaifu enthusiasts

## Why This Product

- Trusted ruicaifu brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Size Range:** Six essential thread sizes (M2 to M6) cover all your 3D printing and plastic fastening needs.
- • **Complete Assortment Kit:** 221 pieces plus bent-foot tweezers—ready for any project, no last-minute runs.
- • **Smooth, Burr-Free Finish:** Safe to handle and ensures perfect screw compatibility without slipping.
- • **Precision Engineered Brass:** High-hardness, corrosion-resistant nuts built to last and perform flawlessly.
- • **Effortless Heat-Embed Installation:** Embed directly into thermoplastics with no extra tools—speed up your workflow.

## Overview

This 221-piece brass knurled nut assortment offers six thread sizes (M2 to M6) crafted from durable, corrosion-resistant brass. Designed for easy heat-embed installation into thermoplastics, these nuts provide high precision, deep threads, and a smooth finish for secure, slip-free fastening—ideal for 3D printing, electronics, and automotive plastic parts.

## Description

Full description not available

## Features

- Premium Material: The thread knurled brass nuts and bolts are made of high-hardness brass, durable, corrosion-resistant, thermally conductive, can be used for a long time and can be installed in many different types of materials.
- Wonderful Workmanship: Our female thread knurled nuts have high precision, deep threads, are compatible with corresponding screws, and are not prone to slipping. And the surface of the nut is smooth and free of burrs, which will not hurt your hands, so you can use it with confidence.
- Easy to Install: After the thread knurled brass nut is heated, it is embedded in a plastic part or injected directly through a mold. The installation can be completed without the assistance of other tools, convenient and fast.
- Wide Application: The female thread knurled nuts are designed for thermoplastics, such as laptop plastic casings, 3D printers, mobile phone casings, automotive plastic parts, and so on.
- What You Get: The package includes 60pcs M2 thread knurled brass nuts, 40pcs M2.5 thread knurled brass nuts, 60pcs M3 thread knurled brass nuts, 30pcs M4 thread knurled brass nuts, 20pcs M5 thread knurled brass nuts, 10pcs M6 thread knurled brass nuts and 1pcs bent-foot tweezers. Nuts of different specifications for you to choose, enough quantity for you to replace and use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Head style | Rändelschraube |
| Finish type | Brass |
| Shape | Rechteckig |
| Item diameter | 6 Millimetres |
| Thread size | M 2 5 |
| Number of pieces | 221 |
| Number of items | 221 |
| Manufacturer | Ruicaifu |
| UPC | 749350477154 |
| Part number | RCF-221luomutaozhuang-0118 |
| Item Weight | 180 g |
| Manufacturer reference | RCF-221luomutaozhuang-0118 |
| Size | M2.5 |
| Finish | Brass |
| Head Style | Rändelschraube |
| Cutting Diameter | 6 Millimetres |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Size:** M2, M2.5, M3, M4, M5, M6
- **Colour:** Silver
- **Material:** Brass
- **Brand:** Ruicaifu
- **Fastener type:** Insert

## Images

![221PCS Thread Knurled Brass Nuts, M2 M2.5 M3 M4 M5 M6 Insert Embedment Nuts Assortment Kit Female Knurled Threaded Insert Nuts for 3D Printing(6 Specifications) - Image 1](https://m.media-amazon.com/images/I/71sOPgHYrXL.jpg)

## Frequently Bought Together

- 221PCS Thread Knurled Brass Nuts, M2 M2.5 M3 M4 M5 M6 Insert Embedment Nuts Assortment Kit Female Knurled Threaded Insert Nuts for 3D Printing(6 Specifications)
- FandWay Heat-Set Insert Soldering Tips Adaptor for Install M2 M2.5 M3 M4 M5 Thread Insert Nut.Compatible with Hakko FX-888D and Weller SP40NKUS Soldering Irons,Used for Connecting 3D Printed Parts.

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**Shop now:** [https://www.desertcart.ec/products/416136297-221pcs-thread-knurled-brass-nuts-m2-m2-5-m3-m4](https://www.desertcart.ec/products/416136297-221pcs-thread-knurled-brass-nuts-m2-m2-5-m3-m4)

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-03-06*