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K40 is a broad label, not a universal optical specification. Measure the installed mirror diameter and thickness and inspect the mirror mounts before ordering. Many K40 replacement paths use 20 mm mirrors, but some machines have different mounts. The genuine replacement mirrors come first; the labelled near-miss kits include mirrors but also require mount or lens compatibility checks.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Cloudray 20 mm Silicon Reflective Mirror Set | $30-$40 | Amazon |
| 2 | OMTech 20 mm Gold-Coated Silicon Mirror Set | $20-$35 | Amazon |
| 3 | Stanser 20 mm Molybdenum Mirror Set | $40-$55 | Amazon |
| 4 | Stanser 25 mm Molybdenum Mirror Set | $40-$55 | Amazon |
| 5 | Cloudray K-Series K40 Head Set, D20 Mo | $65-$85 | Amazon |
| 6 | Cloudray K-Series K40 Head Set, D12 Mo | $65-$85 | Amazon |
| 7 | Cloudray K-Series Whole Set D20 FL50.8 | $75-$90 | Amazon |
| 8 | DIPA Cloudray K40 Laser Head Set | $65-$80 | Amazon |
| 9 | Cloudray K-Series 20 mm Mirror Mount Set | $50-$65 | Amazon · eBay |
The picks, in detail
Cloudray 20 mm Silicon Reflective Mirror Set
Three 20 mm silicon mirrors with gold coating for CO2 laser systems including K40 applications.
- three mirrors
- 20 mm diameter
- 3 mm thickness
- K40 application stated
- Silicon substrate
- Measure existing mount before ordering
OMTech 20 mm Gold-Coated Silicon Mirror Set
Three 20 mm, 3 mm silicon replacement mirrors listed for 30 W to 200 W CO2 machines.
- set of three
- gold-coated silicon
- 20 mm by 3 mm
- CO2 replacement set
- Includes three optical surfaces
- Not proof of fit for every K40 mount
Stanser 20 mm Molybdenum Mirror Set
Three 20 mm molybdenum mirrors for CO2 laser heads.
- three mirrors
- 20 mm option
- molybdenum material
- Actual mirror-only set
- Material clearly identified
- Verify thickness and mount retention
Stanser 25 mm Molybdenum Mirror Set
Three 25 by 3 mm molybdenum mirrors for larger compatible CO2 mounts.
- three mirrors
- 25 mm diameter
- 3 mm thickness
- Clearly dimensioned
- Useful only with 25 mm mounts
- Near-miss for stock 20 mm K40 mounts
Cloudray K-Series K40 Head Set, D20 Mo
Labelled near-miss: K40 head and mount system supplied with 20 mm molybdenum mirrors.
- three D20 mirrors
- K40 head system
- air-assist head
- Includes optical path hardware
- 20 mm mirror size stated
- Requires structural compatibility check
Cloudray K-Series K40 Head Set, D12 Mo
Labelled near-miss: K40 head system using 20 mm mirrors with a 12 mm lens format.
- 20 mm mirrors
- 12 mm lens format
- head and mounts
- Complete optical-hardware route
- Mirror diameter specified
- Lens size and mount layout must match machine
Cloudray K-Series Whole Set D20 FL50.8
Labelled near-miss: complete K40-oriented set with three 20 mm Mo mirrors and a 20 mm 50.8 mm focal-length lens.
- three 20 mm Mo mirrors
- 20 mm lens
- 50.8 mm focal length
- Set contents disclosed
- Includes mounts and head
- May require a custom mounting plate
DIPA Cloudray K40 Laser Head Set
Labelled near-miss: K40 upgrade set including three 20 mm molybdenum mirrors, mounts, and a 12 mm lens.
- three 20 mm Mo mirrors
- 12 mm ZnSe lens
- three mirror mounts
- Detailed contents published
- K40-specific upgrade path
- It is a head-and-mount kit, not mirror-only replacement
Cloudray K-Series 20 mm Mirror Mount Set
Labelled near-miss: mirror-mount and head assembly offered in K40 configurations with 20 mm Mo optics.
- 20 mm mirror format
- mount assembly
- CO2 laser head
- Can replace worn mounts and optics together
- K40 configuration listed
- Machine structure varies; direct fit is not assured
Buying tips
- Measure the existing mirror diameter and thickness, then inspect each mount before ordering; K40 machines are not all built the same.
- A mirror set is not a lens set: a focus lens needs its own diameter and focal-length match.
- Disconnect power and follow the machine maker’s optical-alignment and laser-safety procedure after any mirror or mount work.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.