The Retainer,optical Element, cataloged under National Stock Number 5855-01-180-2172, is classified within Federal Supply Class 5855 (Night Vision Equipment, Emitted and Reflected Radiation) of the Communication, Detection, and Coherent Radiation Equipment group. The manufacturer of record is Lockheed Martin Corporation. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5855-01-180-2172 |
| Primary Part Number | 13075884 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| Flange Diameter | 2.500 INCHES NOMINAL IN |
| Shoulder Length | 0.170 INCHES NOMINAL IN |
| Hole or Slot Quantity | 4 |
| Drive Type | SLOTTED |
| Drive Facility Angular Spacing in Deg | 90.0 |
| Shoulder Thread Size | 2.3125 IN.-40 IN |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Diameter | 2.500 INCHES NOMINAL IN |
| Guide Location | EDGE OPPOSITE DRIVE EDGE |
| Guide Design | THREAD RELIEF |
| Depth | 0.040 INCHES NOMINAL IN |
| Width | 0.060 INCHES NOMINAL IN |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Hole Diameter | 2.188 INCHES NOMINAL 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 5855-01-180-2172 is a Retainer,optical Element, manufactured by Lockheed Martin Corporation, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-180-2172 has 2 manufacturer part numbers on file: 13075884 (Lockheed Martin Corporation), 13075884 (Norman Engineering Corporation).
Key specifications for 13075884: Flange Diameter: 2.500 INCHES NOMINAL IN; Shoulder Length: 0.170 INCHES NOMINAL IN; Hole or Slot Quantity: 4; Drive Type: SLOTTED. 16 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.