NSN 1240-00-555-1661
Part Details | OBSERVATION WINDOW
1240-00-555-1661 A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See WINDOW (as modified); SCALE, CATHODE RAY TUBE; SCALE, PLOTTING; WINDOW, METAL; WINDOW, WOOD; and WINDOW PANEL, AIRCRAFT.
Alternate Parts: 8261623, 1240-00-555-1661, 00-555-1661, 1240005551661, 005551661
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 12 | JAN 01, 1963 | 00-555-1661 | 16880 ( WINDOW, OBSERVATION ) |
REFERENCE DRAWINGS & PICTURES
CIRCULAR
Cross Reference | NSN 1240-00-555-1661
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 8261623 | 19200 | US ARMY ARDEC RDECOM |
Technical Data | NSN 1240-00-555-1661
| Characteristic | Specifications |
|---|---|
| STYLE DESIGNATOR | CIRCULAR |
| OVERALL DIAMETER | 1.934 INCHES MINIMUM AND 1.937 INCHES MAXIMUM |
| OVERALL THICKNESS | 0.312 INCHES NOMINAL |
| MATERIAL | GLASS PLATE |
| SURFACE FINISH | POLISHED |
| MATERIAL TRANSPARENCY | CLEAR |
| EDGE TYPE | BEVELED |
| PLY QUANTITY | 1 |
| SPECIAL FEATURES | LIGHT DEVIATION NOT TO EXCEED 2 MIN OF ARC AND SURFACE QUALITY 80-50 |
| CRITICALITY CODE JUSTIFICATION | ADAV |
