NSN 1240-00-641-0657
Part Details | OPTICAL INSTRUMENT WINDOW
1240-00-641-0657 A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.
Alternate Parts: 3000042, 238518PC6, 1240-00-641-0657, 00-641-0657, 1240006410657, 006410657
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 12 | JAN 01, 1963 | 00-641-0657 | 10908 ( WINDOW, OPTICAL INSTRUMENT ) |
REFERENCE DRAWINGS & PICTURES
Cross Reference | NSN 1240-00-641-0657
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 3000042 | 10001 | NAVAIR AND NAVSEA MANAGEDORIGINAL DESIGN ACTIVITY DWG NOT |
| 238518PC6 | 10001 | NAVAIR AND NAVSEA MANAGEDORIGINAL DESIGN ACTIVITY DWG NOT |
Technical Data | NSN 1240-00-641-0657
| Characteristic | Specifications |
|---|---|
| REFRACTION INDEX | 1.5171 NOMINAL |
| POLISHED SURFACE | BOTH |
| REFLECTION REDUCING SURFACE | BOTH |
| POLISHED PERIPHERY | NOT PROVIDED |
| DIAMETER | 49.000 MILLIMETERS NOMINAL |
| THICKNESS | 5.000 MILLIMETERS NOMINAL |
| BEVEL ANGLE IN DEG | 30.000 NOMINAL |
| BEVEL DEPTH | 3.750 MILLIMETERS NOMINAL |
| FSC APPLICATION DATA | TELESCOPE MK 77 MOD 0 |