BLT421S Consumables: Lens Sizes, Nozzles, Ceramic Rings & Spare Stock
WangAlex1. BLT421S Consumable Sizes and Specifications
Before ordering BLT421S laser cutting head replacement parts, confirm the component position, dimensions and part number.
| Consumable | Specification | Buying Notes |
|---|---|---|
| Upper protective lens | D25.4×4mm | Confirm the exact lens position |
| 2nd-upper protective lens | D25.4×4mm | Separate position; verify the correct part |
| 2nd-lower protective lens | D25.4×4mm | Check the installed cartridge |
| Lower protective lens | D34×5mm | Do not confuse with D25.4×4mm |
| Collimation lens | D32 F100 mm | Confirm the complete optical specification |
| Focus lens | D32 F150 or F200 mm | Select according to the installed head version |
| Flat-cutting nozzle | M11 × 0.75 thread | Choose the correct orifice and nozzle type |
| Ceramic body / ceramic ring | D41 H34 M11 | Confirm dimensions and mounting compatibility |
| Ceramic locking ring | P.S.J0020 | Check the thread and matching assembly |
| Lower protective window spring seal | SRLC-P385 | Verify the part number before purchase |
| Lower protective window cover | DP.M.Q0249AA | This is a cover, not the spring seal |
Important: The dimensions above identify different components and positions. F150 and F200 focusing assemblies also use different part numbers. Always confirm the installed configuration before ordering.
2. Recommended Spare Stock for BLT421S
The quantities below are practical starting points for one laser cutting machine, not official BOCHU stocking requirements.
| Consumable | Suggested Stock | Priority |
|---|---|---|
| Frequently used nozzles | 10–20 pcs, each sizes | High |
| D25.4 × 4 mm protective lenses | 10-50 pcs | High |
| D34 × 5 mm protective lenses | 100 pcs | High |
| Ceramic bodies | 5 pcs | Medium |
| Ceramic locking rings | 1–2 pcs | Medium |
| Spring seals | 5 pcs | Medium |
| Focus or collimation optical assemblies | 1 pc per required type | As needed |
| Sensor module or other major assemblies | 0–1 pc, depending on downtime risk | As needed |
For high-volume cutting operations, increase stock according to consumption and supplier lead time. Distributors should prioritize common nozzle sizes and protective lenses, while keeping expensive assemblies in smaller quantities unless demand justifies more stock.
3. Where to Buy BLT421S Consumables
Browse our related product categories to find replacement parts for your fiber laser cutting equipment:
- Laser Protective Lenses — replacement windows in different diameters and thicknesses.
- Laser Cutting Nozzles — single-layer, double-layer and other nozzle options.
- Focus Lenses — focusing optics for compatible cutting heads.
- Collimation Lenses — collimation optics and related replacement parts.
- Ceramic Rings — ceramic bodies and related components.
- Laser Cutting Heads — explore compatible cutting head products.
If you are unsure which BLT421S consumable you need, send us a photo of the original part, its dimensions or the part number. We can help check the required specification before you place an order.
4. Frequently Asked Questions
What size protective lens does the BLT421S use?
The product manual identifies D25.4×4 mm protective windows in the upper and intermediate positions, and a D34×5mm lower protective window.
What nozzle fits the BLT421S?
The documented nozzle thread is D28 M11×0.75. Select the nozzle orifice and profile according to your material, thickness and cutting process. BLT421S laser head can use both normal D28 nozzles and high speed D28 nozzles.
Does the BLT421S use F150 or F200 focus lenses?
Both focal-length configurations are documented. Confirm which version is installed before ordering a replacement focusing assembly.
How many BLT421S consumables should I keep in stock?
Start with frequently used nozzles and protective windows, then keep a smaller quantity of ceramic bodies and spring seals. Adjust quantities to machine usage, cutting conditions and delivery lead time.
5. Contact Us for BLT421S Replacement Parts
Need BLT421S laser cutting head consumables, replacement lenses or bulk pricing?
Email: alex@umaklaser.com
WhatsApp: +86 18766152065
Website: lasernozzles.com
Send us your required specifications and quantities for a quotation.