The Retainer,optical Element, cataloged under National Stock Number 1240-00-210-4396, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-00-210-4396 |
| Primary Part Number | 1390118 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Radius From Geometric Axis to Hole Center | 0.856 INCHES MINIMUM AND 0.862 INCHES MAXIMUM IN |
| Hole or Slot Quantity | 4 |
| Drive Type | DRILLED HOLE |
| Drive Facility Angular Spacing in Deg | 90.0 |
| Hole Chamfer Diameter | 1.457 INCHES MINIMUM AND 1.462 INCHES MAXIMUM IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Diameter | 0.079 INCHES NOMINAL IN |
| Recess Depth | 0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN |
| Recess Diameter | 1.541 INCHES MINIMUM AND 1.543 INCHES MAXIMUM IN |
| Guide Location | BOTH EDGES |
| Hole Chamfer Angle in Deg | 0.0 |
| Thread Size | 1.874 IN.-32 IN |
| Guide Design | THREAD CHAMFER |
| Depth | 0.250 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY |
| Hole Diameter | 1.457 INCHES MINIMUM AND 1.462 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1240-00-210-4396 is a Retainer,optical Element, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-00-210-4396 has 3 manufacturer part numbers on file: 789PC4 (Leica Inc Surveying and Photogrammetry Systems Div), 789PC4 (American Optical Co), 1390118 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 1390118: Radius From Geometric Axis to Hole Center: 0.856 INCHES MINIMUM AND 0.862 INCHES MAXIMUM IN; Hole or Slot Quantity: 4; Drive Type: DRILLED HOLE; Drive Facility Angular Spacing in Deg: 90.0. 18 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.
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.