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National Stock Number:
9340-00-497-9761
Federal Supply Class:
9340
National Item Identification Number:
004979761
Description:
WINDOW,OBSERVATION
Detail:
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.
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Manufacturer Information:
| 7791932 | 19204 | ARMY, UNITED STATES DEPARTMENT OF THE |
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Techincal Specification:
| EDGE TYPE | BEVELED | | CUBIC MEASURE | 1.367 CUBIC INCHES | | HEAT ABSORBING CHARACTERISTIC | HIGH LIGHT TRANSMISSION | | OVERALL LENGTH | 3.550 INCHES NOMINAL | | OVERALL THICKNESS | 0.150 INCHES NOMINAL | | OVERALL WIDTH | 2.566 INCHES NOMINAL | | MATERIAL DOCUMENT AND CLASSIFICATION | DD-G-451,TYPE I,CLASS 1,QUALITYQ1 FED SPEC SINGLE MATERIAL RESPONSE | | MATERIAL TRANSPARENCY | CLEAR | | MATERIAL | GLASS PLATE | | SPECIAL FEATURES | GLASS IS MIRROR SELECT(FOR SILVERING); ELEMENT PER MIL-R-6771,TYPE I; CLEAR APERATURE = ENTRANCE 66 MM X 63.5MM; SURFACE QUALITY = CENTRAL ZONE 30-10,OUTER ZONE 40-20 PER MIL-O-13830; LIGHT DEVIATION NOT TO EXCEED 2 MIN. OFARC; ANGLE OF INCIDENCE = 45 DEG.,WHITE LIGHT REFLECTANCE 40% +/- 5%,ABSORPTION NOT TO EXCEED 5%; EDGE CHIPS ALLOWABLE OUTSIDE CENTRAL ZONE,SIZE AND NUMBER PER MIL-O-13830; ALL EDGES CHAMFERED TO 0.01 + X 45 DEG. +/- 5 DEG. ; PART TO BE HANDLED ON EDGES ONLY; 2 CORNERS ON POLISHED SIDES CHAMFERED TO0.030 IN. X 45 DEG.; OPPOSITE 2 CORNERS ARE CHAMFERED TO 0.480 IN. X 44 DEGREES | | STYLE DESIGNATOR | CHAMFERED CORNERS | | SURFACE FINISH | GROUND |
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