Import China N-Bk7 Precision Window 12.7*3mm — Buy in wholesale FOB from Supplier in China
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China N-BK7 Precision Window 12.7*3mm
The China N‑BK7 Precision Window 12.7 × 3 mm is a high‑precision optical component supplied by Changchun Sunday Optoelectronics Co., Ltd. It is fabricated from N‑BK7 crown glass, a cost‑effective alternative to fused silica for many laser systems. The window meets a surface flatness of 1/10 λ and a surface quality of either 10‑5 or 20‑10, which limits wavefront distortion. An optional version made from UV fused quartz is also listed for applications requiring superior thermal stability.
BK7 glass typically transmits from 350 nm to 2000 nm with a refractive index of about 1.5168 at the sodium D‑line, making it suitable for visible to near‑infrared lasers. Its coefficient of thermal expansion, roughly 7.1 × 10⁻⁶ /°C, is lower than many specialty glasses but higher than fused quartz, which explains its price advantage. Industry practice tolerates a thickness variation of ±0.01 mm for windows of this size, and a diameter tolerance of ±0.05 mm is common. Suppliers often provide Zygo interferometry reports to verify the flatness claim.
Typical buyers include laser manufacturers, scientific instrument makers and precision metrology equipment firms that need a reliable transmission window. Changchun Sunday Optoelectronics can supply the windows with 24‑inch Zygo flatness reports and can accommodate custom aperture sizes on request. The catalogue does not state a minimum order quantity, lead time or Incoterm, so the importer should confirm these details directly with the supplier before placing an order.
| Dimensions (Diameter × Thickness) | 12.7 mm × 3 mm |
| Material | N‑BK7 optical glass (crown glass) |
| Surface flatness | 1/10 λ (λ = 632.8 nm) |
| Surface quality | 10‑5 or 20‑10 scratch‑dig standard |
| Alternative material | UV fused quartz (high thermal stability) |
| Transmission range (typical) | 350 - 2000 nm (typical for BK7) |
| Refractive index (typical) | n ≈ 1.5168 at 587.6 nm |
| Thermal coefficient of expansion (typical) | ≈ 7.1 × 10⁻⁶ /°C |
| Thickness tolerance (typical) | ±0.01 mm |
| Diameter tolerance (typical) | ±0.05 mm |
Changchun Sunday Optoelectronics Co., Ltd is located at No 9576 Donghuan Road, Changchun, 130000, China. The company is listed under the harbour trust tier, indicating that its business credentials have been verified by the platform. It specialises in the processing of precision optical windows and operates a four‑axis polishing machine, a large‑size ring polishing machine and a two‑axis machine for high‑precision fabrication.
The factory can produce windows up to 600 mm in diameter and offers full Zygo flatness reporting for quality assurance. While the public profile does not disclose response rates or average reply time, the supplier’s verification status suggests a reliable communication channel. No additional certifications or production capacities are mentioned in the listing.
| Business Type | Supplier |
| Year Established | Recently Joined |
| Employees | Contact Supplier |
| Annual Revenue | Contact Supplier |
| Main Products | View Products Tab |
| Major Markets | Global |
| Response Time | <4h |
| Response Rate | New Supplier |
Sourcing China N-BK7 Precision Window 12.7*3mm from Changchun Sunday Optoelectronics Co., Ltd - China Import Guide
Before placing an order, importers should verify the exact material grade, surface flatness and surface quality against the supplier’s test reports. Request a copy of the Zygo flatness data and, if an alternative fused quartz version is considered, confirm its thermal‑expansion coefficient to match the intended laser power level.
Logistics, lead‑time and payment terms are not disclosed in the public data. Confirm the preferred Incoterm (for example FOB Shanghai or CIF Shanghai) and the expected production lead time once the order quantity is defined. Payment methods such as T/T or LC are typical for high‑value optical components, but the buyer must agree on terms with the supplier.
Quality assurance commonly includes a visual inspection, dimensional check and a final interferometric flatness verification. Ask the supplier to provide a certificate of conformity and, if required, arrange a third‑party inspection before shipment. Documentation such as a test report, material certificate and commercial invoice should be reviewed on receipt to ensure compliance.
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30 suppliersBuy China N-Bk7 Precision Win in Bulk — Verified Supplier in China
When sourcing China N-Bk7 Precision Window 12.7*3mm for your business, securing the right balance of quality and cost is essential. Changchun Sunday Optoelectronics Co., Ltd, a verified supplier based in China, offers this product for international export. By purchasing directly from the manufacturer or authorized exporter, buyers can negotiate favorable FOB prices starting at $12/Bags and manage bulk orders with a minimum order quantity (MOQ) of 1 Bags. This product is a staple in the Window Films & Screens sector with strong demand from importing countries worldwide.
China N-Bk7 Precision Win Specifications, Trade Terms & Pricing
Importing China N-Bk7 Precision Win requires careful attention to shipping logistics, customs compliance, and secure payment terms. Changchun Sunday Optoelectronics Co., Ltd offers flexible shipping options such as Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. Common payment methods for international B2B transactions include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P). All transactions and RFQs are facilitated through EximNext, a leading online B2B marketplace designed to make cross-border trade secure and efficient.
About Changchun Sunday Optoelectronics Co., Ltd — Supplier in China
Finding trustworthy partners is the foundation of successful importing. The supplier of this China N-Bk7 Precision Win has been verified on our platform. Whether you are a distributor, wholesaler, or procurement manager, you can request a free quotation, ask for product samples, and finalize your bulk purchase with confidence. EximNext hosts thousands of verified manufacturers and exporters across 200+ countries. Explore similar products in the Window Films & Screens category and connect with top-tier exporters on our comprehensive B2B marketplace. Start your sourcing journey today.
Import China N-Bk7 Precision Win — Shipping, Logistics & Customs
Importing China N-Bk7 Precision Win requires careful attention to shipping logistics, customs compliance, and secure payment terms. Common shipping options include Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. Buyers should verify import duties in their destination country. Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P).
Frequently Asked Questions About China N-Bk7 Precision Win
What is the wholesale price of China N-Bk7 Precision Window 12.7*3mm?
The current listed wholesale price for China N-Bk7 Precision Window 12.7*3mm from Changchun Sunday Optoelectronics Co., Ltd is $12/Bags on FOB terms from China. Prices may vary depending on order volume, packaging, and destination. For the most accurate bulk quote, send a direct RFQ to Changchun Sunday Optoelectronics Co., Ltd through EximNext.
What is the Minimum Order Quantity (MOQ) for China N-Bk7 Precision Win?
The supplier, Changchun Sunday Optoelectronics Co., Ltd, has set a Minimum Order Quantity (MOQ) of 1 Bags for China N-Bk7 Precision Win. For sample requests or smaller trial orders, contact the supplier directly through our platform's inquiry system.
What is the HS Code for China N-Bk7 Precision Window 12.7*3mm?
The HS Code classification for China N-Bk7 Precision Window 12.7*3mm depends on the specific grade and form. Contact Changchun Sunday Optoelectronics Co., Ltd through EximNext for the exact HS Code and customs documentation required for your destination country.
How can I import China N-Bk7 Precision Win from China?
To import China N-Bk7 Precision Win from China, negotiate shipping terms (FOB, CIF, or EXW) directly with Changchun Sunday Optoelectronics Co., Ltd. Ensure you have the necessary import licenses for Window Films & Screens products in your destination country.
Is Changchun Sunday Optoelectronics Co., Ltd a verified supplier?
Yes, Changchun Sunday Optoelectronics Co., Ltd is a verified supplier on EximNext. You can view their complete company profile, business registration details, certifications, and export history before placing a bulk order.
What are the key specifications of China N-Bk7 Precision Window 12.7*3mm?
For a complete technical data sheet or Certificate of Analysis (COA), send an inquiry directly to Changchun Sunday Optoelectronics Co., Ltd through EximNext.
What packaging options are available for bulk orders of China N-Bk7 Precision Win?
Changchun Sunday Optoelectronics Co., Ltd offers China N-Bk7 Precision Win with standard export packaging. Custom packaging, private labeling, and OEM/ODM options may also be available for large wholesale orders.
Which countries import China N-Bk7 Precision Win the most?
China N-Bk7 Precision Win is actively imported by buyers worldwide. Request a destination-specific CIF or CFR quote from Changchun Sunday Optoelectronics Co., Ltd through our platform.
What certifications does this China N-Bk7 Precision Win supplier hold?
Changchun Sunday Optoelectronics Co., Ltd maintains international quality certifications. These ensure that the China N-Bk7 Precision Win meets international quality, safety, and regulatory standards required for cross-border trade.
How do I place a bulk order for China N-Bk7 Precision Window 12.7*3mm on EximNext?
Click "Request Quotation" on this product page, specify your required quantity, preferred shipping terms, and destination country. Changchun Sunday Optoelectronics Co., Ltd will respond with a detailed wholesale quote including FOB pricing, lead time, and payment options.
What payment methods are accepted?
Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), Documents against Payment (D/P), and Escrow services. Confirm accepted terms directly with Changchun Sunday Optoelectronics Co., Ltd.
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