FAQs
Contact Us
- Gavin Yuan
- info@znklaser.com
- +86 19852050793
- Mon – Sun. 9.00 – 20.00
- +86 19852050793
- No. 9, Luoshan Road, Xuzhou Economic and Technological Development Zone, Jiangsu Province, China
Section 1: Product Selection
### Q1: How do I choose the right laser nozzle for my cutting machine?
A:
📸 Photo of your current nozzle or cutting head
⚡ Laser power (e.g., 3kW, 6kW, 12kW, 20kW+)
🔩 Material type and thickness you mainly cut (e.g., carbon steel 6–20mm, stainless steel 3–12mm)
💨 Cutting gas type (oxygen, nitrogen, or air)
Quick Selection Guide:
| Material | Recommended Nozzle Type | Recommended Orifice |
|---|---|---|
| Carbon Steel (Oxygen) | Single-layer | 1.0–2.0mm |
| Stainless Steel / Aluminum (Nitrogen) | Double-layer | 1.0–1.5mm |
| Thick plate high-pressure cutting | High-pressure nozzle | 1.5–3.0mm |
Top Selling Nozzles:
ZNK D32 — #1 Bestseller (848 visits, 33.3% conversion rate)
ZNK C30 — Double-layer chrome-plated (580 visits, 30% conversion)
ZNK D28 — Single-layer high-speed (520 visits, 25% conversion)
### Q2: What is the difference between single-layer and double-layer laser nozzles?
A:
| Type | Gas Channels | Best For | Advantages |
|---|---|---|---|
| Single-layer | 1 | Oxygen cutting, standard applications | Simple design, economical |
| Double-layer | 2 | High-pressure nitrogen cutting | Stable gas flow, cleaner cut edges |
Recommendations:
🔴 Oxygen cutting on carbon steel → Single-layer (ZNK D28 Series)
🔵 Stainless steel / aluminum high-pressure cutting → Double-layer (ZNK C30 Series)
⚡ Thick plate high-pressure cutting → High-pressure double-layer nozzle
### Q3: What nozzle sizes do you offer?
A: We offer a comprehensive size range to suit all cutting heads:
Orifice Size vs. Power / Material:
| Orifice | Power Range | Best Application |
|---|---|---|
| 0.8mm | 1–3kW | Thin plate precision cutting |
| 1.0mm | 2–6kW | General cutting |
| 1.2mm | 3–8kW | Medium / thick plate |
| 1.5mm | 6–12kW | Thick plate cutting |
| 2.0mm | 10–15kW | Ultra-thick plate |
| 2.5–6.0mm | 15kW+ | Special thick-plate processing |
Nozzle Diameter: D20, D22, D24, D25, D28, D32 Height: H11, H12, H15, H15.5 In Stock (Same-day shipping): 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm
### Q4: What are high-pressure (boost) nozzles? When should I use them?
A:
Typical Applications:
| Application | Recommended Nozzle | Pressure Requirement |
|---|---|---|
| Thick carbon steel (>16mm) | High-pressure nozzle | 20–25 bar |
| Thick stainless steel (>10mm) | High-pressure nozzle | 18–24 bar |
| Aluminum cutting | High-pressure nozzle | 16–22 bar |
| Thin plate standard cutting | Regular nozzle | 8–16 bar |
Signs you need a high-pressure nozzle:
Standard nozzle has unstable gas flow at high pressure
Noticeable slag increase when cutting thick plates
Cut surface quality has deteriorated significantly
### Q5: Can you provide free samples before I place a large order?
A: Yes! We provide free samples for quality inspection.
| Order Quantity | Sample Fee | Shipping | Credit |
|---|---|---|---|
| 1–3 pieces | Free | Customer pays | — |
| Order > $1,000 USD | Free | We cover | Full refund |
| Order > $5,000 USD | Free | We cover | Full refund + discount |
Sample delivery: 3–7 days via express courier How to apply: Contact us via WhatsApp: +86 198 5205 0793
### Q6: What materials are your nozzles made of?
A:
| Material | Key Features | Best For | Price Tier |
|---|---|---|---|
| Pure Copper | Excellent thermal conductivity | General applications | Economy |
| Hardened Copper | High durability, deformation-resistant | High-power lasers (6kW+) | Mid-range |
| Chrome-plated Copper | Corrosion-resistant, longer service life | Oxygen cutting | Premium |
Certifications: ISO 9001 | CE | RoHS
### Q7: How do I select Raytools laser protective lenses?
A: Raytools is a professional laser accessories brand trusted by cutting machine manufacturers worldwide. We supply factory-quality lenses at just 10–20% of typical market prices.
Popular Lens Models:
| Model | Dimensions | Compatible Cutting Heads | Power Range | Our Price |
|---|---|---|---|---|
| BT220 / BM110 | 27.9×4.1mm | Raytools cutting heads | 3–6kW | From $1.54 |
| BM109 | 24.9×1.5mm | Raytools BM109 | 1–3kW | Contact us |
| BT340 | 34×4.0mm | High-power models | 6–12kW | Contact us |
Why choose our Raytools lenses?
✅ Only 10–20% of market price (Market: $10–20 / Ours: from $1.54)
✅ In stock — ships same day
✅ #2 bestseller: Raytools Lens 27.9mm (770 visits, 73.3% conversion rate)
How to order: Share your cutting head model or a photo — we’ll confirm compatibility in minutes.
### Q8: How do I know when to replace laser protective lenses?
A:
Replacement Signs:
| Symptom | Meaning | Action |
|---|---|---|
| Lens blackened or burned | Lens damaged | Replace immediately |
| Cutting quality deteriorated | Lens contaminated | Clean or replace |
| Lens fogging / condensation | Moisture or coolant leak | Inspect and replace |
| Visible cracks | Physical damage | Replace immediately |
Recommended Replacement Cycle:
| Usage Intensity | Cycle |
|---|---|
| Light use | Every 2–4 weeks |
| Normal industrial use | Every 1–2 weeks |
| Heavy / continuous use | Every 3–5 days |
💡 Pro tip: Keep 10–20 spare lenses on hand to avoid production downtime.
### Q9: How do I select and maintain capacitive sensor probes?
### Q10: What materials can handheld laser marking machines mark?
### Q11: What cutting head spare parts do you offer?
### Q12: Do you offer lens cleaning and maintenance tools?
Section 2: Technical Support
### Q1: How often should I replace laser nozzles?
A:
| Usage Level | Replacement Cycle | Typical Scenario |
|---|---|---|
| Light use | Every 2–4 weeks | Prototyping, small batches |
| Normal industrial | Every 3–7 days | Standard production |
| Heavy / high-power | Every 1–3 days | Thick plate, continuous cutting |
Signs you need a new nozzle:
🔴 Noticeably decreased cutting quality or increased slag
🔴 Abnormal increase in gas consumption
🔴 Visible deformation or damage at nozzle tip
🔴 Wavy or uneven lines appearing on cut surface
### Q2: My nozzle keeps clogging. What should I do?
A: Follow these 5 troubleshooting steps:
Check gas purity — Nitrogen must be >99.9%; air cutting needs dry, clean air
Check gas pressure — Confirm pressure matches nozzle specs; check for leaks
Check focus distance — Maintain 0.5–1.5mm standard height; avoid collisions
Check material quality — Avoid rusty or oily surfaces; material must be clean
Inspect nozzle condition — Look for damage or wear; replace if necessary
### Q3: How do I clean and maintain laser lenses?
A: Lens contamination directly impacts cutting quality. Clean carefully:
Cleaning Procedure:
Wear nitrile gloves
Use dedicated lens paper — apply a small amount of optical cleaning fluid
Wipe gently — spiral motion from center outward
Inspect light transmission — confirm no residue or smears remain
Common Mistakes to Avoid:
| ❌ Don’t | Reason |
|---|---|
| Blow with your mouth | Saliva and moisture contaminate the lens |
| Use regular tissue | Fibers scratch the coating |
| Use alcohol | Damages the optical coating |
| Wipe too hard | Causes coating to peel or micro-scratch |
Maintenance Schedule:
Protective lens: Check every shift
Focusing lens: Inspect monthly
Spare lenses: Store in a sealed, dry container
### Q4: What should I do when cutting produces excessive slag?
A:
Slag Troubleshooting Flowchart:
Excessive Slag
├─ Gas Issue
│ ├─ Insufficient pressure → Increase gas pressure
│ ├─ Insufficient purity → Use higher purity gas
│ └─ Wrong gas type → Switch (e.g., O₂ → N₂ for stainless)
│
├─ Nozzle Issue
│ ├─ Nozzle clogged → Clean or replace nozzle
│ ├─ Wrong orifice size → Match orifice to material/thickness
│ └─ Nozzle damaged → Replace with new nozzle
│
└─ Parameter Issue
├─ Insufficient power → Increase laser power
├─ Cutting speed too fast → Reduce speed
└─ Focus offset → Re-calibrate focal point
Material-Specific Gas Recommendations:
| Material | Gas | Pressure Range | Notes |
|---|---|---|---|
| Carbon steel | Oxygen | 8–15 bar | High pressure blows off slag |
| Stainless steel | Nitrogen | 15–22 bar | High pressure = slag-free edges |
| Aluminum | Nitrogen | 16–24 bar | Higher pressure required |
### Q5: Cutting Head Daily Maintenance Checklist
DELIVERY & RETURN
1. What items can't be returned?
About return wrong items, As long as the。。。 is not damaged, no stains.
It will not affect us sale again, you can pack it well and return back to us.
We will check it after received the goods. If there is no problem, we will refund you immediately.
However, since it is not the product problem, please note that the shipping cost and taxes(including the taxes on ourside ) should be paid by yourside.
As you know, we are in China. Actually the shipping cost for returning may be equal to or higher than the price of the prodcut itself.
2. What items can't be returned?
About return wrong items, As long as the。。。 is not damaged, no stains.
It will not affect us sale again, you can pack it well and return back to us.
We will check it after received the goods. If there is no problem, we will refund you immediately.
However, since it is not the product problem, please note that the shipping cost and taxes(including the taxes on ourside ) should be paid by yourside.
As you know, we are in China. Actually the shipping cost for returning may be equal to or higher than the price of the prodcut itself.
ORDER RELATED
1.Will I be charged a customs tax?
Ship from CN: Taxes may apply for imported goods/services and is regulated by the country law. Cloudray Laser Store is not responsible for any tax invoice charged on its products. Shipping rates are estimates and may depend on different policies and tax rates applied per country. Please contact local customs for clarity and information.
Tax laws for selling to EU member countries changed on July 1, 2021, orders equal to or less than 150 EUR have VAT applied to them, and orders greater than 150 EUR have import VAT and duties applied.
For European Union, orders equal to or less than 150 EUR at checkout, as merchant, we will collect VAT on orders, and our customers don’t pay taxes upon delivery. If orders over than 150 EUR, as merchant, we do not charge you any VAT, you local Customs will charge you import VAT and duties when parcel arrive in your country.
The UK VAT laws that came into force on January 1, 2021 result in new VAT requirements for sales equal to or less than 135 GBP.
For United Kingdom, If the sale of goods is equal to or less than 135 GBP, In this case, VAT is collected at the point of sale and remitted by the merchant. If the sale of goods is over 135 GBP, In this case, VAT and duties are remitted by the importer.
Ship from US / DE / UK: The price includes VAT tax. Tax does not need to be paid separately.
2.Will I be charged a customs tax?
Ship from CN: Taxes may apply for imported goods/services and is regulated by the country law. Cloudray Laser Store is not responsible for any tax invoice charged on its products. Shipping rates are estimates and may depend on different policies and tax rates applied per country. Please contact local customs for clarity and information.
Tax laws for selling to EU member countries changed on July 1, 2021, orders equal to or less than 150 EUR have VAT applied to them, and orders greater than 150 EUR have import VAT and duties applied.
For European Union, orders equal to or less than 150 EUR at checkout, as merchant, we will collect VAT on orders, and our customers don’t pay taxes upon delivery. If orders over than 150 EUR, as merchant, we do not charge you any VAT, you local Customs will charge you import VAT and duties when parcel arrive in your country.
The UK VAT laws that came into force on January 1, 2021 result in new VAT requirements for sales equal to or less than 135 GBP.
For United Kingdom, If the sale of goods is equal to or less than 135 GBP, In this case, VAT is collected at the point of sale and remitted by the merchant. If the sale of goods is over 135 GBP, In this case, VAT and duties are remitted by the importer.
Ship from US / DE / UK: The price includes VAT tax. Tax does not need to be paid separately.
PAYMENT ISSUES
1.What should I do if my card is declined?
——Payment failed: 80022:Not Sufficient Funds
It usually happens when cardholder send up to $1000 in a single transaction. (This amount can vary, though, depending on your currency.)
In this case, would you please recheck with your bank or financial staff?
——Payment failed: 80097:Transaction Declined
It usually happens when cardholder Fail to Pass 3D Authorized Service.
In this case, please try to confirm card number and 3D verification are correct and then re-pay.
——Payment failed: 10000: Payment is declined
It usually happens when the bank security alarms are triggered, then our bank may determine this order is high risk, so they refused.
Could you please provide the credit card Numbers ( first six and last four digits)?Or passport, driving licence?
Cloudray will offer your informat to our bank, so that our bank add you to white list of acceptable customers.
——Payment failed: 80010:Transaction Do Not Honour
It usually happens when the bank security alarms are triggered, then your bank may determine this order is high risk, so they refused.
The following takes place:
1. Related to overseas consumption, in order to ensure the security of the cardholder’s credit card, the bank will refuse to process overseas consumption. Or set by the customers himself.
2. The buyer has set a limit on the amount of online purchases, so the payment fails.
If the above problem is not resolved, you can pay via Paypal.
Bank Account (Paypal):cloudray.pay@gmail.com
2.What should I do if my card is declined?
——Payment failed: 80022:Not Sufficient Funds
It usually happens when cardholder send up to $1000 in a single transaction. (This amount can vary, though, depending on your currency.)
In this case, would you please recheck with your bank or financial staff?
——Payment failed: 80097:Transaction Declined
It usually happens when cardholder Fail to Pass 3D Authorized Service.
In this case, please try to confirm card number and 3D verification are correct and then re-pay.
——Payment failed: 10000: Payment is declined
It usually happens when the bank security alarms are triggered, then our bank may determine this order is high risk, so they refused.
Could you please provide the credit card Numbers ( first six and last four digits)?Or passport, driving licence?
Cloudray will offer your informat to our bank, so that our bank add you to white list of acceptable customers.
——Payment failed: 80010:Transaction Do Not Honour
It usually happens when the bank security alarms are triggered, then your bank may determine this order is high risk, so they refused.
The following takes place:
1. Related to overseas consumption, in order to ensure the security of the cardholder’s credit card, the bank will refuse to process overseas consumption. Or set by the customers himself.
2. The buyer has set a limit on the amount of online purchases, so the payment fails.
If the above problem is not resolved, you can pay via Paypal.
Bank Account (Paypal):cloudray.pay@gmail.com
