Zero-Length Glass Viewports
Larson Electronic Glass zero-length glass viewports are supplied with fully annealed, commercial grade, optical quality 7056 glass windows in nine standard sizes from ¾” through 6”. Moderate cost combined with good optical and physical properties make them the preferred choice for a wide variety of applications.
Our zero length viewports are offered with CF type flanges for use below 1x10-11 Torr, and in ISO type o-ring seal flanges for use in intermediate vacuum ranges. Window surfaces offer a minimum of distortion and provide maximum light transmission suitable for most applications. Custom viewports are also available.
Features:
- Zero-length offers greater distortion-free view area
- Zero-length viewports magnetic Kovar® content only 1% to 3%
- Kovar® offers superior mechanical strength
- >90% Transmission from 360nm to 2300nm
- Optional AR Coatings available
- CF mount bakeable to 250°C, 10°C/Min gradient , 200°C maximum with AR Coating
- ISO Kwik-Flange® and Large-Flange® bakeable to 200°C, 10°C/Min gradient
- Can be used with leaded glass shields
Request a quote today on the zero length glass viewports you need, or contact Larson Electronic Glass for assistance.
Larson Electronic Glass offers "Zero-Length Glass Viewports" available in 9 standard sizes from 3/4 inch through 6 inch with a variety of flange options. Dimensions are in inches unless otherwise noted.
| Image | Zero-Length Glass Viewports | Flange | View diameter (V) | Height (H) | Glass thickness (T) | Model Number | Part Number |
|---|---|---|---|---|---|---|---|
 | 3/4" Zero-Length Glass Viewport | 1.33" CF | .63" | .29" | .070" | VP-075-F1 | 111102 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.6-133 | 112401 | |||||
 | 3/4" Zero-Length Glass Viewport | NW16 | .63" | .36" | .070" | VP-075-K1 | 111104 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.6B-K16 | 112444 | |||||
 | 3/4" Zero-Length Viewport | NW25 | .63" | .21" | .070" | VP-075-K2 | 111105 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.6-K25 | 112524 | |||||
 | 3/4" Zero-Length Viewport | NW40 | .63" | .50" | .070" | VP-075-K4 | 111106 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.6-K40 | 112539 | |||||
 | 1" Zero-Length Glass Viewport | 2.75" CF | .90" | .50" | .085" | VP-100-F2 | 111110 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.9-275 | 112405 | |||||
 | 1" Zero-Length Glass Viewport | NW25 | .90" | .51" | .085" | VP-100-K2 | 111115 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.9B-K25 | 112445 | |||||
 | 1" Zero-Length Glass Viewport | NW40 | .90" | .45" | .085" | VP-100-K4 | 111116 |
| Purchase at Accu-Glass Products, Inc. | VPG-0.9B-K40 | 112446 | |||||
 | 1-1/2" Zero-Length Glass Viewport | 2.75" CF | 1.40" | .50" | .105" | VP-150-F2 | 111162 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.4-275 | 112402 | |||||
 | 1-1/2" Zero-Length Viewport | 3.37" CF | 1.40" | .63" | .105" | VP-150-F3 | 111163 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.4-338 | 112406 | |||||
 | 1-1/2" Zero-Length Glass Viewport | NW50 | 1.40" | .50" | .105" | VP-150-K5 | 111166 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.4B-K50 | 112447 | |||||
 | 1-1/2" Zero-Length Glass Viewport | NW63 | 1.40" | .73" | .105" | VP-150-L6 | 111167 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.4-L63 | 112541 | |||||
 | 1-1/2" Zero-Length Glass Viewport | NW80 | 1.40" | .73" | .105" | VP-150-L8 | 111168 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.4-L80 | 112448 | |||||
 | 2" Zero-Length Glass Viewport | 3.37" CF | 1.90" | .63" | .125" | VP-200-F3 | 111192 |
| Purchase at Accu-Glass Products, Inc. | VPG-1.9-338 | 112411 | |||||
 | 2" Zero-Length Glass Viewport | NW63 | 1.90" | .73" | .125" | VP-200-L6 | 111195 |
| Purchase at Accu-Glass Products, Inc. | VPG‐1.9‐L63 | 112414 | |||||
 | 2" Zero-Length Glass Viewport | NW80 | 1.90" | .73" | .125" | VP-200-L8 | 111196 |
| Purchase at Accu-Glass Products, Inc. | VPG‐1.9‐L80 | 112449 | |||||
 | 2-1/2" Zero-Length Glass Viewport | 4.5" CF | 2.69" | .68" | .170" | VP-250-F4 | 111212 |
| Purchase at Accu-Glass Products, Inc. | VPG-2.7-450 | 112403 | |||||
 | 2-1/2" Zero-Length Glass Viewport | 4.62" CF | 2.69" | .75" | .170" | VP-250-F5 | 111213 |
| Purchase at Accu-Glass Products, Inc. | VPG-2.7-462 | 112408 | |||||
 | 3" Zero-Length Glass Viewport | 6" CF | 2.69" | .78" | .170" | VP-300-F6 | 111233 |
| Purchase at Accu-Glass Products, Inc. | VPG-2.7-600 | 112409 | |||||
 | 3" Zero-Length Glass Viewport | NW100 | 2.69" | .73" | .170" | VP-300-L10 | 111235 |
| Purchase at Accu-Glass Products, Inc. | VPG-2.7-L100 | 112451 | |||||
 | 4" Zero-Length Glass Viewport | 6" CF | 3.88" | .78" | .200" | VP-400-F6 | 111272 |
| Purchase at Accu-Glass Products, Inc. | VPG-3.8-600 | 112404 | |||||