| 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) | 00-171-7901 (001717901) |
| NCB Code | USA (00) |
| Manufacturer | Navair And Navsea Managed |
| MRC | Criteria | Characteristic |
|---|---|---|
| ZZZV | III FSC APPLICATION DATA | RANGEFINDER MK 51 MODS 0-3 |
| MATL | MATERIAL | GLASS, OPTICAL, JAN-G-174, TYPE 517-645, GRADE C |
| ABMZ | DIAMETER | 60.000 MILLIMETERS NOMINAL |
| ABNM | THICKNESS | 7.000 MILLIMETERS NOMINAL |
| BMMX | REFRACTION INDEX | 1.5170 NOMINAL |
| BMSG | POLISHED SURFACE | BOTH |
| BMSH | DISPERSION | 64.5 ANGSTROMS NOMINAL |
| BMSK | REFLECTION REDUCING SURFACE | BOTH |
| BMSM | POLISHED PERIPHERY | NOT PROVIDED |
| Relevant Components for NSN - 1240-00-171-7901, 1240001717901 | ||||
| 1220-00-603-3266 (1220006033266) | 1270-00-345-7085 (1270003457085) | 1280-00-507-8645 (1280005078645) | 1240-00-389-3528 (1240003893528) | |
| 1280-01-224-9344 (1280012249344) | 1210-00-275-8925 (1210002758925) | 1240-01-500-3263 (1240015003263) | 1270-00-916-0160 (1270009160160) | |
| 1285-00-760-9308 (1285007609308) | 1260-00-382-4403 (1260003824403) | 1220-00-389-3368 (1220003893368) | 1260-00-724-0473 (1260007240473) | |
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