---
product_id: 153201697
title: "40W CO2 Glass Laser Tube 700mm Length Dia 50mm for Laser Engraving and Cutting Machine (Buy More Discounts)"
brand: "sentech"
price: "42579 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Sen Tech"
url: https://www.desertcart.is/products/153201697-40w-co2-glass-laser-tube-700mm-length-dia-50mm-laser
store_origin: IS
region: Iceland
---

# 40W stable power output 700mm precision length Pre-installed leads for quick setup 40W CO2 Glass Laser Tube 700mm Length Dia 50mm for Laser Engraving and Cutting Machine (Buy More Discounts)

**Brand:** sentech
**Price:** 42579 kr
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your engraving game with power and precision!

## Quick Answers

- **What is this?** 40W CO2 Glass Laser Tube 700mm Length Dia 50mm for Laser Engraving and Cutting Machine (Buy More Discounts) by sentech
- **How much does it cost?** 42579 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/153201697-40w-co2-glass-laser-tube-700mm-length-dia-50mm-laser)

## Best For

- sentech enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Advanced technology extends tube lifespan, minimizing downtime and maximizing productivity.
- • **Power that Cuts Through:** 40W upgraded laser tube delivers faster, cleaner engraving and cutting performance.
- • **Plug & Play Installation:** Pre-connected leads simplify setup—get your laser up and running in minutes, no hassle.
- • **Factory-Tested Reliability:** Each tube is rigorously tested before shipping, so you avoid costly delays and enjoy peace of mind.
- • **Precision Engineered Length:** 700mm length and 50mm diameter ensure perfect fit and optimal beam focus for your machine.

## Overview

The SenTECH 40W CO2 Glass Laser Tube is a 700mm long, 50mm diameter laser tube designed for engraving and cutting machines. Featuring an upgraded stable power output and pre-installed leads for easy installation, it offers enhanced cutting speed and long operational life. Each tube undergoes factory testing to ensure reliability, making it a trusted choice for professionals seeking efficient and durable laser performance.

## Description

IntroductionOutput power: 40 WDimensions: Length 700 mmInstallation instructions:1. Determine the positive and negative poles of the laser tube ( Near the spiral glass tube inside is positive and the other is negative).2. Insert the water inlet pipe and outlet pipe into the water, usually the positive high pressure line is the input, the part of light output is the exit. Before you launch the machine, you need to check the tube to see whether it is normal. 3. Adjust the optical path with the laser and test switch on the machine. The ultimate goal is to make the laser point enter from the middle of the entrance hole of the laser head, and then adjust the vertical optical path.4. When the light path is adjusted, the engraving can be cut or used, according to the actual situation to control the power output.[WARNING]1. The high-voltage power supply of the laser requires reliable isolation!2. The cooling water should have at least 20 liters, and change it every two weeks.Suitable temperature less than 30 grades3. In winter, the water in the laser tube needs to be discharged first to prevent the tube from freezing and cracking.4.This laser product is not visible light. The laser beam has a burn or more serious damage to the body. In the area of ​​the optical path of the optical transmission, the laser burn must be avoided during work and when you using !Avoid of unnecessary damage, please open one end of the tube and then take the tube out carefully.

Review: Installed leads makes install a breeze - So thankful for the installed leads on the ends. My laser was quickly back up and running. I also think that the packaging was excellent, so that I didn't have to worry about it arriving broken. Hopefully, I will not need another tube any time soon, but if I do - I will order here. Note to laser hobbyists - My laser was by a window, and vented out. My laser froze during a deep freeze and broke. If you have your laser conveniently vented by a window, make sure your laser tube does not freeze!!
Review: Tube arrived defective - I installed this laser tube and a new Power Supply Unit (PSU) at the same time. The laser tube would fire, but not fire at full strength. (See the old and new Power vs Speed charts photo) A brand new laser tube should easily be able to cut through 3mm Baltic Birch plywood using the settings you see on the left. As you can see in the chart on the right, even at 100% Power and 14% Speed, the laser could not cut through. Then I noticed that when the laser ran, it would start flickering after a few seconds. The positive terminal of the laser operates at extremely high voltage (~20,000 Volts). I was worried that maybe the electricity was short circuiting to the case at some point along the wire. That's why I coated the wire connection point AND the terminal of the laser with thick globs of silicone (Please see photo of laser inside.) I also placed a sheet of plexiglass between the laser tube and the metal case. (plexiglass has higher electrical resistance than air) Still, the laser was flickering when it ran. Finally, I tried running the laser in the dark. As you can see from the flashing light in the video, at the positive end of the laser tube something is short circuiting. The flash is happening inside the tube. I know it's not happening at the far side of the tube because there's a sheet of plexiglass between the tube and the wall, and the plexiglass shows no sign of damage. Therefore no electricity is going through it, therefore the short circuit is in the tube. Plus I've tried the machine with 2 other working PSUs and they did not fix the problem. Therefore, again, the problem is this tube. Since the short circuit is inside the laser tube, the laser tube itself is defective. I would like to request a new, fully functional tube be sent to me.

## Features

- 1. [Parameters]: 40 Watt 700mm length Ø50mm
- 2. Each tube HAS BEEN TESTED before leaving from our factory, we try our best to give a good shopping experience and make you not waste time and lose money.
- 3. [Installation]: You need to make sure the positive and negative pole. We HAVE CONNECTED the LEADS, so that you can quickly install the tube.
- 4. [Upgraded version]: Upgraded laser tube has a more stable power, which is favorable to increase the cutting speed. The tube has LONG-TIME LIFE because of the especial technology.
- 5. [Application]: It is mainly used for LASER ENGRAVING CUTTING MACHINE and other engraving equipments. If it is broken in the transportation, contact us please, we are trying our best to solve your problem.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | SenTECH |
| Item Weight | 1.63 Kilograms |
| Material | Glass |
| Operation Mode | Automatic |
| Product Dimensions | 27.56"L x 1.97"W |
| Style | Laser |

## Product Details

- **Brand:** SenTECH
- **Material:** Glass
- **Product Dimensions:** 27.56"L x 1.97"W
- **Style:** Laser
- **Operation Mode:** Automatic

## Images

![40W CO2 Glass Laser Tube 700mm Length Dia 50mm for Laser Engraving and Cutting Machine (Buy More Discounts) - Image 1](https://m.media-amazon.com/images/I/3177vAO57NL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can i run a rv antifreeze insted of water to prevent freezing?**
A: NO, has to be water. It's not used to prevent freezing, not for melting

**Q: What is the beam radius and divergence?**
A: Hi, dear. 
The beam radius is about 1.5mm.

**Q: I got this tube and it is 4 inches longer than my original will it still work for my machine?**
A: If this fits in your machine you'll need to make sure the power supply matches up to the power requirements of the tube. Without any other information it seems like you have the wrong tube.

**Q: I had issues with pre-wired tubes that there would be arking where the two lines are spiced together.  What is the proper way to avoid this?**
A: I didn't have that issue with this tube. Arcing suggest poor connection. Make sure you have a good amount of bare wire . If your still worried, you can solder the connection. Make sure to insulate the connection.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Installed leads makes install a breeze
*by D***G on January 27, 2023*

So thankful for the installed leads on the ends. My laser was quickly back up and running. I also think that the packaging was excellent, so that I didn't have to worry about it arriving broken. Hopefully, I will not need another tube any time soon, but if I do - I will order here. Note to laser hobbyists - My laser was by a window, and vented out. My laser froze during a deep freeze and broke. If you have your laser conveniently vented by a window, make sure your laser tube does not freeze!!

### ⭐ Tube arrived defective
*by L***A on February 10, 2024*

I installed this laser tube and a new Power Supply Unit (PSU) at the same time. The laser tube would fire, but not fire at full strength. (See the old and new Power vs Speed charts photo) A brand new laser tube should easily be able to cut through 3mm Baltic Birch plywood using the settings you see on the left. As you can see in the chart on the right, even at 100% Power and 14% Speed, the laser could not cut through. Then I noticed that when the laser ran, it would start flickering after a few seconds. The positive terminal of the laser operates at extremely high voltage (~20,000 Volts). I was worried that maybe the electricity was short circuiting to the case at some point along the wire. That's why I coated the wire connection point AND the terminal of the laser with thick globs of silicone (Please see photo of laser inside.) I also placed a sheet of plexiglass between the laser tube and the metal case. (plexiglass has higher electrical resistance than air) Still, the laser was flickering when it ran. Finally, I tried running the laser in the dark. As you can see from the flashing light in the video, at the positive end of the laser tube something is short circuiting. The flash is happening inside the tube. I know it's not happening at the far side of the tube because there's a sheet of plexiglass between the tube and the wall, and the plexiglass shows no sign of damage. Therefore no electricity is going through it, therefore the short circuit is in the tube. Plus I've tried the machine with 2 other working PSUs and they did not fix the problem. Therefore, again, the problem is this tube. Since the short circuit is inside the laser tube, the laser tube itself is defective. I would like to request a new, fully functional tube be sent to me.

### ⭐⭐⭐⭐⭐ Nice quality tube, easy to install, well-packaged.
*by T***H on January 28, 2021*

I needed to replace a weak tube in my K40, and went with this over some slightly lower-priced options based on the reviews and product rating. I'm very happy with it. I did a bit of an overhaul to my machine while I had the tube out, new lights, water cooling loop, new bed, mirrors, fume extraction, and lens. It's running better than it ever has. This tube is outputting excellent power. It arrived very well-packaged in double boxes, with lots of foam. No issues with packaging whatsoever. I think what I appreciated the most though is that it comes with pole leads already attached. I picked up slicone in advance, and was really relieved to not have to use it to secure the leads to each pole post. I was dreading that. I'm sure I'd make a mess of that. I simply cut back the wiring soldered in the new leads that were already attached, slipped on my hoses and I was up and running. I don't know if I had a junk tube from the start or what, but the power from this tube/setup is significantly better than when I got the machine brand new. I hope this tube lasts me a long time, but as of right now I can say that I would buy this again, and recommend it to any K40 owner out there who's on the fence about whether this tube is worth the $20 or whatever they might be able to save elsewhere. You'll get a good tube with pole leads installed that is well-packaged in just a few days time.

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-04*