NSN 1240-00-864-2936
Part Details | OPTICAL INSTRUMENT WINDOW
1240-00-864-2936 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: 7645552, 1240-00-864-2936, 00-864-2936, 1240008642936, 008642936
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 12 | JAN 01, 1962 | 00-864-2936 | 10908 ( WINDOW, OPTICAL INSTRUMENT ) |
REFERENCE DRAWINGS & PICTURES
Cross Reference | NSN 1240-00-864-2936
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 7645552 | 19200 | US ARMY ARDEC RDECOM |
Technical Data | NSN 1240-00-864-2936
| Characteristic | Specifications |
|---|---|
| POLISHED SURFACE | BOTH |
| SURFACE FINISH | GROUND AND POLISHED |
| POLISHED PERIPHERY | PROVIDED |
| DIAMETER | 1.740 INCHES MINIMUM AND 1.745 INCHES MAXIMUM |
| THICKNESS | 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| BEVEL ANGLE IN DEG | 42.000 MINIMUM AND 48.000 MAXIMUM |
| BEVEL DEPTH | 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM |
| SPECIAL FEATURES | ELEMENT IN ACCORD WITH SPEC MIL-O-13830; SPHERICAL POWER NOT TO EXCEED 3 FRINGES,ASTIGMATISM 2 FRINGES; LIGHT DEVIATION NOT TO EXCEED 2 MINUTES (0.033 DEG) OF ARC; SURFACES QUALITY 80-50; USED ON PERISCOPE AND HOWITZERS M109A2 AND M109A3 |