The Window,optical Instrument, cataloged under National Stock Number 1240-00-171-4178, is classified within Federal Supply Class 1240 (No Item Name Available) of the Fire Control Equipment group. The primary manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-00-171-4178 |
| Primary Part Number | 1040155 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — No Item Name Available |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Polished Periphery | NOT PROVIDED |
| Refraction Index | 1.5170 NOMINAL |
| Thickness | 5.800 MILLIMETERS MINIMUM AND 6.200 MILLIMETERS MAXIMUM MM |
| Diameter | 50.950 MILLIMETERS MINIMUM AND 51.000 MILLIMETERS MAXIMUM MM |
| Material | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |
| Material Document and Classification | JAN-G-174, TYPE 517-645, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| FSC Application Data | TELESCOPE MK 102 MOD 3 |
| Polished Surface | BOTH |
| Bevel Depth | 0.750 MILLIMETERS NOMINAL MM |
| Reflection Reducing Surface | BOTH |
| Bevel Angle in Deg | 45.000 NOMINAL |
| Dispersion | 64.5 ANGSTROMS NOMINAL |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 1240-00-171-4178 is a Window,optical Instrument, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 1240 (No Item Name Available). Status: active.
NSN 1240-00-171-4178 has 2 cross-referenced part numbers: 1040155 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 52476 (Optical Technology Devices Inc).
There are 3 known substitutes for 1240-00-171-4178: 1610-00-127-6517, 5340-01-434-2219, 4730-01-503-7906. Verify interchangeability with system specifications before substitution.
Key specifications for 1040155: Polished Periphery: NOT PROVIDED; Refraction Index: 1.5170 NOMINAL; Thickness: 5.800 MILLIMETERS MINIMUM AND 6.200 MILLIMETERS MAXIMUM MM; Diameter: 50.950 MILLIMETERS MINIMUM AND 51.000 MILLIMETERS MAXIMUM MM. 12 total characteristics are documented in the Federal Logistics Information System.