The Retainer,optical Element, cataloged under National Stock Number 1240-01-320-1003, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Lockheed Martin Corporation. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-320-1003 |
| Primary Part Number | 13077163-501 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| Hole or Slot Quantity | 4 |
| Drive Type | SLOTTED |
| Hole Chamfer Diameter | 1.029 INCHES MINIMUM AND 1.033 INCHES MAXIMUM IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Recess Depth | 0.130 INCHES NOMINAL IN |
| Recess Diameter | 0.974 INCHES MINIMUM AND 1.004 INCHES MAXIMUM IN |
| Hole Chamfer Angle in Deg | 30.0 |
| Thread Size | 1.125 IN.-40 IN |
| Guide Design | THREAD CHAMFER |
| Width | 0.040 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 0.974 INCHES MINIMUM AND 1.004 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 |
| Part Number | Manufacturer |
|---|---|
| 13077163-501 PRIMARY | Lockheed Martin Corporation (USA) |
| Reference | Meaning |
|---|---|
| 13077163-501 | 5/9 Secondary reference Program Manager Advanced Attack Helicopter Barcom Amcpm-Aah |
NSN 1240-01-320-1003 is a Retainer,optical Element, manufactured by Lockheed Martin Corporation, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-320-1003 has 1 manufacturer part number on file: 13077163-501 (Lockheed Martin Corporation).
Key specifications for 13077163-501: Hole or Slot Quantity: 4; Drive Type: SLOTTED; Hole Chamfer Diameter: 1.029 INCHES MINIMUM AND 1.033 INCHES MAXIMUM IN; Style Designator: RECESSED. 14 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.