---
product_id: 653781833
title: "QSJ 180Pcs Threaded Inserts Heat Set Inserts Kit M2.5x4x3.5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials"
brand: "qsj"
price: "$16.80"
currency: USD
in_stock: true
reviews_count: 8
category: "Qsj"
url: https://www.desertcart.us/products/653781833-qsj-180pcs-threaded-inserts-heat-set-inserts-kit-m2-5x4x3
store_origin: US
region: United States of America
---

# Heat-set with included soldering tip 180 premium brass inserts M2.5x4x3.5 precision size QSJ 180Pcs Threaded Inserts Heat Set Inserts Kit M2.5x4x3.5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials

**Brand:** qsj
**Price:** $16.80
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your 3D prints with brass-backed strength — don’t get left holding weak plastic!

## Quick Answers

- **What is this?** QSJ 180Pcs Threaded Inserts Heat Set Inserts Kit M2.5x4x3.5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials by qsj
- **How much does it cost?** $16.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/653781833-qsj-180pcs-threaded-inserts-heat-set-inserts-kit-m2-5x4x3)

## Best For

- qsj enthusiasts

## Why This Product

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

## Key Features

- • **Precision Fit:** M2.5x4x3.5 size engineered for perfect embedding and maximum grip in plastic materials.
- • **Heat-Set Simplicity:** Includes a custom soldering iron tip for seamless, mess-free installation into 3D printed plastics.
- • **Bulk Brass Brilliance:** 180 high-quality brass inserts for long-lasting durability and professional-grade fastening.
- • **Versatile Reinforcement:** Ideal for 3D printed prototypes, plastic joints, and quick emergency fixes that demand strength.
- • **Reliable Structural Integrity:** Transforms fragile plastic parts into robust, screw-ready components that withstand stress.

## Overview

The QSJ 180Pcs Threaded Inserts Kit features 180 precision brass inserts (M2.5x4x3.5) designed for heat-set installation into 3D printed plastics. Included is a soldering iron tip tailored for easy embedding, ensuring durable, reliable threaded connections that reinforce plastic parts and prototypes with professional-grade strength.

## Description

QSJ 180Pcs Threaded Inserts Heat Set Inserts Kit M2.5x4x3.5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials: desertcart.com: Industrial & Scientific

Review: great for projects, great for emergencies, great heat inserts - i bought these for a few random projects i had or will have so it just sat in my drawer, soldering iron tips and everything. but when i needed these inserts oh boy did they work beautifully. i don't have the most professional soldering iron but the soldering iron tip this comes with fits great and fits the little inserts good enough for me to melt them into whatever i need and once ive melted them in, boy do they grip. the inserts are tough and tight in the plastic, and it's easy to use to screw in whatever you need. the example i bought a plastic shotgun stock that came in a pretty poor state, where the buttpad was supposed to screw on and there was no hole for the screw. come in these little inserts, went in nice and smooth and worked with my junk drawer mlok screws for a quick, cheap and solid fix, the few dollars i paid for these inserts actually made my shotgun stock worth it's price which is a win.
Review: love it - Worth the money just to have the tip for the soldering iron. Everything fits and works well with my weller soldering iron.

## Features

- 【Packaging】: Each set includes 180 high-quality brass threaded inserts, each measuring M2.5x4x3.5, accompanied by a soldering iron tip for easy installation.
- 【Premium Material】: Crafted from high-quality brass, these threaded inserts ensure durability and excellent performance, making them ideal for various 3D printing plastic materials.
- 【Easy to Use】: Pre-drill a pilot hole in the target plastic material. Using a soldering iron, heat up the insert until it reaches the Tm. Align it with the pilot hole and firmly press it into the plastic material. Apply slight downward pressure to ensure proper embedding. Allow it to cool down and solidify within the plastic material.
- 【Versatile Application】 These threaded inserts are perfect for a wide range of applications, such as securing parts in 3D-printed prototypes, reinforcing plastic joints, or adding threaded inserts to plastic components.
- 【Reliable Fastening Solution】: By embedding these threaded inserts, you can achieve a strong and reliable connection, enhancing the structural integrity of your plastic products and ensuring they withstand stress and tension.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D7M383N8 |
| Best Sellers Rank | #6,738 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #12 in Nut Inserts |
| Brand | QSJ |
| Color | Gold |
| Compatible Groove Diameter | 10.2 Millimeters |
| Customer Reviews | 4.7 out of 5 stars 205 Reviews |
| Drive Style | Spline |
| Exterior Finish | Brass |
| Fastener Type | Insert |
| Finish Types | Polished |
| Inside Thread Size | M2.5 |
| Item Dimensions | 3.15 x 2.76 x 0.47 inches |
| Item Height | 1.2 centimeters |
| Manufacturer | qsj-nut |
| Material | Brass |
| Material Type | Brass |
| Maximum Shear Strength | [High] |
| Metal Type | Brass |
| Number of Pieces | 180 |
| Screw Head Style | Square |
| Size Name | (180pcs) M2.5x4x3.5 |
| Thread Class | Class 2A |
| Thread Coverage | Partially Threaded |
| Thread Size | #8-32 |
| Thread Style | Right Hand |
| Thread Type | Unified National Coarse |

## Product Details

- **Material:** Brass
- **Fastener Type:** Insert
- **Thread Size:** #8-32
- **Exterior Finish:** Brass
- **Color:** Gold

## Images

![QSJ 180Pcs Threaded Inserts Heat Set Inserts Kit M2.5x4x3.5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials - Image 1](https://m.media-amazon.com/images/I/71gWth7AoVL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ great for projects, great for emergencies, great heat inserts
*by M***O on May 30, 2025*

i bought these for a few random projects i had or will have so it just sat in my drawer, soldering iron tips and everything. but when i needed these inserts oh boy did they work beautifully. i don't have the most professional soldering iron but the soldering iron tip this comes with fits great and fits the little inserts good enough for me to melt them into whatever i need and once ive melted them in, boy do they grip. the inserts are tough and tight in the plastic, and it's easy to use to screw in whatever you need. the example i bought a plastic shotgun stock that came in a pretty poor state, where the buttpad was supposed to screw on and there was no hole for the screw. come in these little inserts, went in nice and smooth and worked with my junk drawer mlok screws for a quick, cheap and solid fix, the few dollars i paid for these inserts actually made my shotgun stock worth it's price which is a win.

### ⭐⭐⭐⭐⭐ love it
*by B***D on December 30, 2025*

Worth the money just to have the tip for the soldering iron. Everything fits and works well with my weller soldering iron.

### ⭐⭐⭐⭐⭐ Good grip
*by M***A on December 9, 2025*

Very nice. Pro tip, flip upside down and press into table to get a nice surface finish.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-22*