The Window,optical Instrument, cataloged under National Stock Number 1240-01-209-3934, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-209-3934 |
| Primary Part Number | 12343612 |
| Item Name | Window,optical Instrument |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Surface Finish | GROUND AND POLISHED |
| Bevel Depth | 0.020 INCHES NOMINAL IN |
| Material Document and Classification | MIL-G-174, GRADE B, TYPE 517-642 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 0.410 INCHES NOMINAL IN |
| Reflection Reducing Surface | BOTH |
| Polished Periphery | PROVIDED |
| Bevel Angle in Deg | 45.000 NOMINAL |
| Material | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |
| Polished Surface | BOTH |
| Thickness | 0.050 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12343612 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 1240-01-209-3934 is a Window,optical Instrument, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-209-3934 has 1 manufacturer part number on file: 12343612 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12343612: Surface Finish: GROUND AND POLISHED; Bevel Depth: 0.020 INCHES NOMINAL IN; Material Document and Classification: MIL-G-174, GRADE B, TYPE 517-642 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Diameter: 0.410 INCHES NOMINAL IN. 10 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1240-01-209-3934 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.