| Item Name | Window Optical Inst |
| Federal Supply Group (FSG) | Fire Control Equipment |
| Federal Supply Class (FSC) | 1240 Optical Sighting And Ranging Equipment |
| National Item Identification Number (NIIN) | 00-171-4182 (001714182) |
| NCB Code | USA (00) |
| Manufacturer | Navair And Navsea Managed |
| MRC | Criteria | Characteristic |
|---|---|---|
| FEAT | SPECIAL FEATURES | 4 CORNERS 4.0 MM /0.1575 IN./ RADIUS |
| ABGL | WIDTH | 29.500 MILLIMETERS NOMINAL |
| ABRY | LENGTH | 56.800 MILLIMETERS NOMINAL |
| MATL | MATERIAL | GLASS, OPTICAL, JAN-G-174, TYPE 523-586, GRADE C |
| ABNM | THICKNESS | 3.000 MILLIMETERS NOMINAL |
| BMMX | REFRACTION INDEX | 1.5230 NOMINAL |
| BMSG | POLISHED SURFACE | BOTH |
| BMSK | REFLECTION REDUCING SURFACE | BOTH |
| BMSM | POLISHED PERIPHERY | NOT PROVIDED |
| Relevant Components for NSN - 1240-00-171-4182, 1240001714182 | ||||
| 1265-00-614-8088 (1265006148088) | 1240-01-118-9964 (1240011189964) | 1285-00-449-6275 (1285004496275) | 1270-01-119-6523 (1270011196523) | |
| 1290-01-330-1595 (1290013301595) | 1270-00-313-9175 (1270003139175) | 1280-00-868-4875 (1280008684875) | 1290-01-546-6194 (1290015466194) | |
| 1290-01-416-9390 (1290014169390) | 1290-01-069-3391 (1290010693391) | 1270-00-019-7649 (1270000197649) | 1270-00-023-3389 (1270000233389) | |
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