Laser cutting procurement
Prepare enquiry →Laser Protective Windows / 27.9 × 4.1 mm Laser Protective Windows
Laser optics · Procurement enquiries
27.9 × 4.1 mm Laser Protective Windows
Request 27.9 × 4.1 mm replacement cover glass for fiber laser cutting-head enquiries. Keep exact dimensions, head and part references for a batch quote.
Exact specification and supply terms are confirmed in the quotation.
Product identity & nominal size
Keep 27.9 × 4.1 mm in the enquiry as written. Do not round the request to 28 × 4 mm or treat a nearby catalogue size as the same part. A drawing or legible part reference is the best starting point for checking the intended fit.
- Record both decimal dimensions in millimetres.
- If measurements and the part label disagree, submit both as separate references.
- Confirm the installation position and drawing tolerances before ordering.
Available nominal sizes
Choose a nominal size to prepare an enquiry. Listed dimensions do not establish stock, optical grade or verified compatibility.
1 nominal size options
Position & head reference
Confirm the installation position from your exact head documentation. Market references are shown separately and remain subject to part-level checking.
Power grade verification
No verified power grade is currently published for this enquiry option. Provide your operating conditions so the quotation can specify the required evidence.
Typical application enquiry
Replacement protective-lens and cover-glass enquiries for fiber laser cutting heads. Keep the 27.9 × 4.1 mm dimensions unchanged in purchase lines, head-reference checks and quotation requests; do not replace them with a rounded catalogue size.
Specifications
Requested nominal size: 27.9 × 4.1 mm. Manufacturing tolerances, material, coating and optical performance must be specified in the quotation.
| Nominal enquiry size | Requested diameter | Requested thickness | Basis |
|---|---|---|---|
| 27.9 × 4.1 mm | 27.9 mm | 4.1 mm | Enquiry dimensions; supplied specification requires confirmation |
Available enquiry variants
This page covers one nominal size. Different material or coating configurations should be added as documented variants after qualification; none are represented as verified options yet.
How to order
Copy the nominal dimensions, add the exact head and part reference, then provide wavelength and quantity. Ask the quotation to identify the specification revision and acceptance documents.
Compatibility Matrix
Compatibility can vary by head revision, optical position and power grade. Use the references below as a purchasing guide and share the exact model or part number when available.
Verified Reference: confirmed exact-configuration evidence. Common Reference: an association recorded in existing professional research. Model Check Required: brand or series level only — share your exact head model or part number.
| Maker / head reference | Nominal size reference | Reference Status | Notes | Action |
|---|---|---|---|---|
| Raytools BM109 | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5 (top) / 27.9x4.1 (bottom). | View size → |
| Raytools BM111 | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5 (top) / 27.9x4.1 (bottom). | View size → |
| Raytools BD04K | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5 (top) / 27.9x4.1 (bottom). | View size → |
| Raytools BT240S | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5 (top) / 27.9x4.1 (bottom). | View size → |
| Raytools BT220RC | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5 (top) / 27.9x4.1 (bottom). | View size → |
| Raytools FM220 | 27.9 × 4.1 mm | Common Reference | Research size context: 22.4x4.1 (50/60mm FL) / 27.9x4.1 (80/100mm FL). | View size → |
| Bodor Unspecified (10-pack 'Bodor equipment') | 27.9 × 4.1 mm | Common Reference | Research size context: 24.9x1.5, 27.9x4.1, 37x7. | View size → |
| OSPRI Exact model required | Confirm from part reference | Model Check Required | Provide the exact head model and part reference for checking. | Send model → |
| SUP Exact model required | Confirm from part reference | Model Check Required | Provide the exact head model and part reference for checking. | Send model → |
| Qilin Exact model required | Confirm from part reference | Model Check Required | Provide the exact head model and part reference for checking. | Send model → |
| Hanwei Exact model required | Confirm from part reference | Model Check Required | Provide the exact head model and part reference for checking. | Send model → |
11 reference rows
Read the cross-reference guide →Frequently Asked Questions
What should I check for 27.9 × 4.1 mm?
Keep 27.9 × 4.1 mm in the enquiry as written. Do not round the request to 28 × 4 mm or treat a nearby catalogue size as the same part. A drawing or legible part reference is the best starting point for checking the intended fit.
Does the listed size confirm compatibility?
No. Treat the dimensions as an enquiry starting point. Confirm the head model, revision, window position, drawing and required optical specification before ordering.
How are power grades confirmed?
Ask for evidence tied to the exact material, coating, wavelength and operating conditions of the quoted part. A machine power label or nominal window size is not a verified grade for the replacement.
What are the MOQ, stock and lead time?
Request a quotation with your size and quantity. Availability, minimum order quantity and delivery timing are confirmed for the quoted configuration.
Prepare a complete enquiry
Send the details you know. Leave uncertain inputs open for confirmation.
| Enquiry input | What to provide |
|---|---|
| Size | Diameter × thickness in mm; include drawing tolerances if available. |
| Cutting Head Model | Exact head maker, model, revision and installation position; for welding, provide the welding-head model. |
| Laser Power | State the machine operating power as an enquiry input, not as a window rating. |
| Wavelength | Provide the laser-source wavelength from the equipment documentation. |
| Quantity | Quantity per size, sample needs and repeat-order forecast if known. |
| Part Number | Copy the existing part reference exactly; identify whose reference it is. |
| Photo / Drawing Reference | Include an accessible reference link or document identifier in your enquiry. No upload is offered here. |
Product enquiry: 27.9 × 4.1 mm Laser Protective Windows Size: 27.9 × 4.1 mm Cutting / welding head model and position: Laser power: Wavelength: Quantity per size: Part number: Photo / drawing reference:
In the RFQ form, enter size under Dimensions / specification and the quantity in Quantity. Paste this checklist into Additional requirements for the head model, power and part reference. WhatsApp opens the same enquiry inputs. This page does not offer file upload.
Resources & Media
Laser Protective Windows →Laser Optics product family →Optical Component RFQ Checklist →Protective Window Compatibility Cross-Reference →How to Identify Your Laser Protective Window →
Request evidence for the actual part
Use the quotation to confirm the material, coating, inspection record and any required test data. The representative image is for product-category identification only.