The Retainer,optical Element, cataloged under National Stock Number 5855-01-662-0849, 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 Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5855-01-662-0849 |
| Primary Part Number | 6631658-1 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc |
| Status | ACTIVE |
| Flange Diameter | 2.000 INCHES NOMINAL IN |
| Shoulder Length | 0.100 INCHES NOMINAL IN |
| Shoulder Diameter | 1.900 INCHES NOMINAL IN |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Guide Design | THREAD RELIEF |
| Internal Annular Serration | PROVIDED |
| Material | ALUMINUM ALLOY |
| Hole Diameter | 1.830 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 |
| Part Number | Manufacturer |
|---|---|
| 6631658-1 | Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 6631658-1 | 3/2 Design control — primary reference U.S. Government activity |
| 6631658 | D/9 Drawing number reference only U.S. Government activity |
NSN 5855-01-662-0849 is a Retainer,optical Element, manufactured by Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-662-0849 has 1 manufacturer part number on file: 6631658-1 (Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc).
Key specifications for 6631658-1: Flange Diameter: 2.000 INCHES NOMINAL IN; Shoulder Length: 0.100 INCHES NOMINAL IN; Shoulder Diameter: 1.900 INCHES NOMINAL IN; Style Designator: SHOULDERED. 9 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.