FAQs

Contact Us

  • Gavin Yuan
  • [email protected]
  • +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

A: Please provide the following details and we’ll recommend the best nozzle model for you:

  • 📸 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:

MaterialRecommended Nozzle TypeRecommended Orifice
Carbon Steel (Oxygen)Single-layer1.0–2.0mm
Stainless Steel / Aluminum (Nitrogen)Double-layer1.0–1.5mm
Thick plate high-pressure cuttingHigh-pressure nozzle1.5–3.0mm

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)

A:

TypeGas ChannelsBest ForAdvantages
Single-layer1Oxygen cutting, standard applicationsSimple design, economical
Double-layer2High-pressure nitrogen cuttingStable 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

A: We offer a comprehensive size range to suit all cutting heads:

Orifice Size vs. Power / Material:

OrificePower RangeBest Application
0.8mm1–3kWThin plate precision cutting
1.0mm2–6kWGeneral cutting
1.2mm3–8kWMedium / thick plate
1.5mm6–12kWThick plate cutting
2.0mm10–15kWUltra-thick plate
2.5–6.0mm15kW+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

A: High-pressure (boost) nozzles are engineered for cutting applications that require extremely high gas pressure — typically above 20 bar.

Typical Applications:

ApplicationRecommended NozzlePressure Requirement
Thick carbon steel (>16mm)High-pressure nozzle20–25 bar
Thick stainless steel (>10mm)High-pressure nozzle18–24 bar
Aluminum cuttingHigh-pressure nozzle16–22 bar
Thin plate standard cuttingRegular nozzle8–16 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

A: Yes! We provide free samples for quality inspection.

Sample Policy:

Order QuantitySample FeeShippingCredit
1–3 piecesFreeCustomer pays—
Order > $1,000 USDFreeWe coverFull refund
Order > $5,000 USDFreeWe coverFull refund + discount

Sample delivery: 3–7 days via express courier How to apply: Contact us via WhatsApp: +86 198 5205 0793

A: All nozzles are made from high-quality, internationally certified materials:

MaterialKey FeaturesBest ForPrice Tier
Pure CopperExcellent thermal conductivityGeneral applicationsEconomy
Hardened CopperHigh durability, deformation-resistantHigh-power lasers (6kW+)Mid-range
Chrome-plated CopperCorrosion-resistant, longer service lifeOxygen cuttingPremium

Certifications: ISO 9001 | CE | RoHS

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:

ModelDimensionsCompatible Cutting HeadsPower RangeOur Price
BT220 / BM11027.9×4.1mmRaytools cutting heads3–6kWFrom $1.54
BM10924.9×1.5mmRaytools BM1091–3kWContact us
BT34034×4.0mmHigh-power models6–12kWContact us

Why choose our Raytools lenses?

  • ✅ Factory quality — certified authentic with anti-counterfeit labels

  • ✅ 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.

A: Protective lenses are the “first line of defense” for your cutting head. Replacing them on time protects your expensive focusing lens.

Replacement Signs:

SymptomMeaningAction
Lens blackened or burnedLens damagedReplace immediately
Cutting quality deterioratedLens contaminatedClean or replace
Lens fogging / condensationMoisture or coolant leakInspect and replace
Visible cracksPhysical damageReplace immediately

Recommended Replacement Cycle:

Usage IntensityCycle
Light useEvery 2–4 weeks
Normal industrial useEvery 1–2 weeks
Heavy / continuous useEvery 3–5 days

💡 Pro tip: Keep 10–20 spare lenses on hand to avoid production downtime.

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ACCOUNT RELATED

A: Replacement frequency depends on usage intensity:

Usage LevelReplacement CycleTypical Scenario
Light useEvery 2–4 weeksPrototyping, small batches
Normal industrialEvery 3–7 daysStandard production
Heavy / high-powerEvery 1–3 daysThick 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

A: Follow these 5 troubleshooting steps:

  1. Check gas purity — Nitrogen must be >99.9%; air cutting needs dry, clean air

  2. Check gas pressure — Confirm pressure matches nozzle specs; check for leaks

  3. Check focus distance — Maintain 0.5–1.5mm standard height; avoid collisions

  4. Check material quality — Avoid rusty or oily surfaces; material must be clean

  5. Inspect nozzle condition — Look for damage or wear; replace if necessary

A: Lens contamination directly impacts cutting quality. Clean carefully:

Cleaning Procedure:

  1. Wear nitrile gloves — never touch the lens surface with bare fingers

  2. Use dedicated lens paper — apply a small amount of optical cleaning fluid

  3. Wipe gently — spiral motion from center outward

  4. Inspect light transmission — confirm no residue or smears remain

Common Mistakes to Avoid:

❌ Don’tReason
Blow with your mouthSaliva and moisture contaminate the lens
Use regular tissueFibers scratch the coating
Use alcoholDamages the optical coating
Wipe too hardCauses 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

A: Slag is one of the most common laser cutting issues. Use this systematic approach:

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:

MaterialGasPressure RangeNotes
Carbon steelOxygen8–15 barHigh pressure blows off slag
Stainless steelNitrogen15–22 barHigh pressure = slag-free edges
AluminumNitrogen16–24 barHigher pressure required

A: Follow this checklist to maximize cutting head life:

Daily Checks:

  • Protective lens clean and undamaged?
  • Nozzle clear of clogs or deformation?
  • Copper nozzle contact ring in good condition?
  • Cooling water flowing normally?

Weekly Checks:

  • Cutting head exterior for visible damage?
  • Seals showing signs of aging?
  • Gas lines for leaks?
  • Sensor probe responding correctly?

Monthly Checks:

  • Focusing lens condition
  • Recalibrate laser beam path
  • Full cooling system inspection
  • Clean accumulated metal dust and debris

A: Use these reference parameters as a starting point — fine-tune for your specific equipment:

Carbon Steel (Oxygen cutting):

ThicknessPowerSpeedGas PressureNozzle Orifice
3mm3kW4 m/min8 bar1.0mm
6mm6kW2.5 m/min10 bar1.2mm
10mm6kW1.2 m/min12 bar1.5mm
16mm12kW0.8 m/min15 bar2.0mm

Stainless Steel (Nitrogen cutting):

ThicknessPowerSpeedGas PressureNozzle Orifice
2mm6kW10 m/min16 bar1.0mm
3mm6kW6 m/min18 bar1.2mm
6mm12kW3 m/min20 bar1.5mm
10mm15kW1.5 m/min22 bar2.0mm

Aluminum (Nitrogen cutting):

ThicknessPowerSpeedGas PressureNozzle Orifice
3mm12kW5 m/min18 bar1.2mm
6mm15kW2 m/min20 bar1.5mm
10mm20kW1 m/min22 bar2.0mm

⚠️ These parameters are for reference only. Actual values depend on your machine brand, beam quality, and focal length.

A:

Common Causes:

  • Sudden temperature changes causing moisture condensation

  • Cooling system water leak

  • High workshop humidity (>60%)

Immediate Response:

  1. Stop cutting — prevent further contamination or lens damage

  2. Replace protective lens — a fogged lens may already be compromised

  3. Inspect cooling system — check for water leaks at fittings

  4. Check gas lines — ensure dry gas circulation

  5. Reduce workshop humidity — use a dehumidifier if necessary

Prevention Measures:

MethodDetails
Maintain stable temperatureAvoid large thermal swings in the workshop
Use dry gasEnsure gas supply is dried before use
Inspect seals regularlyPrevent coolant seepage into optical cavity
Dehumidify workspaceKeep relative humidity below 60%

A:

Warning Signs:

SymptomLikely CauseRecommended Action
Regular streaks on cut surfaceCollimator / focusing lens issueClean or replace lens set
Unusual noise from cutting headBearing damageSchedule professional repair
Frequent collisionsHeight sensor failureInspect and replace probe
Uneven gas distributionDamaged gas distributorRepair or replace
Noticeably reduced laser powerAging or contaminated lensReplace full lens assembly

Recommendation: Schedule a professional inspection every 6 months, or immediately if any of the above symptoms appear.

Orders & Services

A:

Product TypeMOQNotes
Standard nozzles10 pcs/sizeIn stock, ships immediately
Lens products5 pcsOriginal packaging
Sensors / probes10 pcsStandard specs
Custom nozzles100 pcsManufactured to drawing
Sample orders1 pcMixed items allowed

We understand the need for small trial batches — sample orders are always welcome!

A:

Order AmountPayment Method
< $10,000100% T/T prepayment
$10,000 – $50,00050% deposit, 50% before shipment
> $50,000Negotiable credit terms
Sample ordersT/T, PayPal, Alipay

Accepted Currencies: USD, EUR, CNY Company account: Supports wire transfer (T/T) PayPal: Available for samples and small orders

A:

Order TypeLead TimeShipping Method
In-stock items3–7 daysDHL / FedEx / UPS
Standard orders7–15 daysAir freight
Custom / OEM orders15–30 daysAir or sea freight
Bulk orders (>1,000 pcs)20–40 daysSea freight

Express Option: DHL Express (3–5 days) — available at extra charge. Tracking: Full shipment tracking provided for all orders.

A: Import duties depend on your country and order value:

RegionOrder ValueTax Situation
EU≤ €150VAT collected at checkout — no extra fees on arrival
EU> €150Import VAT + customs duty payable upon arrival
UK≤ £135VAT collected at checkout — no extra fees
UK> £135VAT + customs duty required upon arrival
USA< $800Duty-free under de minimis threshold
USA≥ $800Customs duty may apply
Others—Check your local import regulations

Tips to reduce duty costs:

  • Orders below the duty-free threshold avoid import fees

  • We provide a commercial invoice and certificate of origin with every shipment

  • Contact us to discuss shipping strategies for large orders

A: Yes! We offer full customization services:

ServiceDescriptionMOQ
OEMCustom packaging, branded labels500 pcs/model
ODMManufactured to your specifications or drawings100 pcs
White LabelFull private-label solution1,000 pcs

Customization Process:

  1. Share your design or technical requirements

  2. We provide a proposal and quotation

  3. Confirm and produce samples for approval

  4. Mass production

  5. Quality inspection → shipment

A:

CertificationScope
ISO 9001Quality Management System
CEEuropean market compliance
RoHSEnvironmental / hazardous substance compliance
SGSThird-party material testing

Quality Assurance Process:

  • 100% factory inspection before shipment

  • Material test certificates available on request

  • Third-party testing reports available for bulk orders

A:

Volume Discount Tiers:

Order AmountDiscountExample Savings
$1,000 – $5,0005% off$1,000 → $950
$5,000 – $10,0008% off$5,000 → $4,600
$10,000 – $30,00012% off$10,000 → $8,800
> $30,00015%+Contact us

Agent / Distributor Program:

TierAnnual PurchaseDiscount
Bronze$10,000 – $30,00020%
Silver$30,000 – $100,00025%
Gold$100,000 – $300,00030%
Diamond$300,000+35%

Agent Benefits Include:

  • Regional exclusive distribution rights

  • Official brand authorization certificate

  • Dedicated customer service support

  • Priority stock allocation

A:

ChannelDetails
📧 Email[email protected]
📱 WhatsApp+86 198 5205 0793
☎️ Phone+86 198 5205 0793
🌐 Websitehttps://znklaser.com
👤 ContactGavin Yuan (Founder)

Business Hours: Monday – Saturday, 09:00–18:00 (Beijing Time, UTC+8) Response Guarantee: All inquiries answered within 24 hours.

For a fast quote, please include:

  1. Product model number or photos

  2. Quantity required

  3. Your country / region

  4. Preferred shipping method (air / sea / express)

CONTACT US TODAY

  • +86 19852050793
  • [email protected]
  • WhatsApp : +86 19852050793
  • Founder : Gavin Yuan
  • Add: No. 9, Luoshan Road, Xuzhou Economic and Technological Development Zone, Jiangsu Province, China

©2012 China ZNK All Rights Reserved

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