The Retainer,optical Element, cataloged under National Stock Number 1240-01-320-0121, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-320-0121 |
| Primary Part Number | 13077324-501 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| Hole Chamfer Diameter | 1.715 INCHES MINIMUM AND 1.725 INCHES MAXIMUM IN |
| Style Designator | RECESSED |
| Setscrew Notch | NOT PROVIDED |
| Recess Depth | 0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN |
| Recess Diameter | 1.968 INCHES MINIMUM AND 1.969 INCHES MAXIMUM IN |
| Guide Location | BOTH EDGES |
| Hole Chamfer Angle in Deg | 15.0 |
| Thread Size | 1.9375 IN.-32 IN |
| Guide Design | THREAD CHAMFER |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 1.570 INCHES MINIMUM AND 1.575 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 |
|---|---|
| 13077324-501 | Omega Precision (USA) |
| 13077324-501 | Paragon Machine Inc. (USA) |
| 13077324-501 PRIMARY | Lockheed Martin Corporation (USA) |
| Reference | Meaning |
|---|---|
| 13077324-501 | 5/9 Secondary reference Program Manager Advanced Attack Helicopter Barcom Amcpm-Aah |
NSN 1240-01-320-0121 is a Retainer,optical Element, manufactured by Lockheed Martin Corporation, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-320-0121 has 3 manufacturer part numbers on file: 13077324-501 (Omega Precision), 13077324-501 (Paragon Machine Inc.), 13077324-501 (Lockheed Martin Corporation).
Key specifications for 13077324-501: Hole Chamfer Diameter: 1.715 INCHES MINIMUM AND 1.725 INCHES MAXIMUM IN; Style Designator: RECESSED; Setscrew Notch: NOT PROVIDED; Overall Length: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN. 12 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.