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| Specifications |
| Material: |
N-BK7 grade A glass |
| Diameter: |
We offer standard round windows with diameter from 5.0mm to 150mm. Some are listed below. |
| Surface Flatness: |
best finish l/20 depends on the size |
| Surface Quality: |
from 10-5 to 60-40 depends on the size |
| Parallelism: |
± upto 2 arc seconds |
| Clear Aperture: |
> 90%~95% central |
| Chamfer: |
< 0.25~0.5 mm at 45o |
| Antireflection Coating: |
single layer, multi-layer broadband, customer specified |
| Part No. | Diameter | Thickness | Surface Quality | Surface Flatness |
| BKW0026 | 5.0 mm | 1.0 mm | 10-5 | l/10 |
| BKW0031 | 5.0 mm | 1.5 mm | 10-5 | l/10 |
| BKW0050 | 6.0 mm | 1.0 mm | 10-5 | l/10 |
| BKW0057 | 6.0 mm | 1.5 mm | 10-5 | l/10 |
| BKW0067 | 6.35 mm | 1.0 mm | 10-5 | l/10 |
| BKW0070 | 6.35 mm | 1.5 mm | 10-5 | l/10 |
| BKW0115 | 8.0 mm | 1.0 mm | 10-5 | l/4 |
| BKW0120 | 8.0 mm | 1.5 mm | 10-5 | l/4 |
| BKW0139 | 9.0 mm | 1.0 mm | 20-10 | l/5 |
| BKW0146 | 9.0 mm | 2.0 mm | 20-10 | l/10 |
| BKW0165 | 10.0 mm | 1.5 mm | 0-5 | l/5 |
| BKW0173 | 10.0 mm | 2.0 mm | 10-5 | l/8 |
| BKW0205 | 12.7 mm | 2.0 mm | 40-20 | l/2 |
| BKW0209 | 12.7 mm | 2.0 mm | 10-5 | l/10 |
| BKW0211 | 12.7 mm | 2.5 mm | 20-10 | l/4 |
| BKW0214 | 12.7 mm | 2.5 mm | 10-5 | l/10 |
| BKW0217 | 12.7 mm | 3.0 mm | 10-5 | l/10 |
| BKW0236 | 13.5 mm | 2.0 mm | 20-10 | l/4 |
| BKW0242 | 13.5 mm | 2.5 mm | 20-10 | l/10 |
| BKW0268 | 15.0 mm | 2.0 mm | 20-10 | l/4 |
| BKW0275 | 15.0 mm | 3.0 mm | 20-10 | l/10 |
| BKW0296 | 18.0 mm | 2.0 mm | 40-20 | l/2 |
| BKW0302 | 18.0 mm | 3.0 mm | 20-10 | l/4 |
| BKW0336 | 20.0 mm | 2.0 mm | 40-20 | l/2 |
| BKW0339 | 20.0 mm | 3.0 mm | 20-10 | l/4 |
| BKW0367 | 21.5 mm | 2.0 mm | 40-20 | l/2 |
| BKW0375 | 21.5 mm | 3.0 mm | 20-10 | l/8 |
| BKW0418 | 25.0 mm | 2.0 mm | 40-20 | l/4 |
| BKW0426 | 25.0 mm | 3.0 mm | 20-10 | l/4 |
| BKW0442 | 25.4 mm | 2.0 mm | 40-20 | l/2 |
| BKW0446 | 25.4 mm | 3.0 mm | 40-20 | l/5 |
| BKW0451 | 25.4 mm | 5.0 mm | 20-10 | l/10 |
| BKW0480 | 27.5 mm | 3.0 mm | 40-20 | l/4 |
| BKW0487 | 27.5 mm | 4.0 mm | 20-10 | l/10 |
| BKW0512 | 30.0 mm | 3.0 mm | 20-10 | l/4 |
| BKW0518 | 30.0 mm | 4.0 mm | 20-10 | l/10 |
| BKW0539 | 32.5 mm | 3.0 mm | 20-10 | l/4 |
| BKW0546 | 32.5 mm | 4.0 mm | 20-10 | l/4 |
| BKW0567 | 34.5 mm | 3.0 mm | 40-20 | l/4 |
| BKW0572 | 34.5 mm | 4.0 mm | 20-10 | l/10 |
| BKW0626 | 38.1 mm | 3.0 mm | 40-20 | l/4 |
| BKW0630 | 38.1 mm | 4.0 mm | 20-10 | l/4 |
| BKW0637 | 38.1 mm | 5.0 mm | 20-10 | l/10 |
| BKW0815 | 50.8 mm | 3.0 mm | 40-20 | l/4 |
| BKW0822 | 50.8 mm | 4.0 mm | 40-20 | l/4 |
| BKW0826 | 50.8 mm | 5.0 mm | 20-10 | l/10 |
| BKW0835 | 50.8 mm | 6.0 mm | 20-10 | l/10 |
| BKW1129 | 76.2 mm | 4.0 mm | 40-20 | l/4 |
| BKW1142 | 76.2 mm | 6.0 mm | 20-10 | l/10 |
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