The Retainer,optical Element, cataloged under National Stock Number 5855-01-039-2857, 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 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5855-01-039-2857 |
| Primary Part Number | SMD850409 |
| 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 |
| Radius From Geometric Axis to Hole Center | 0.765 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN |
| Shoulder Length | 0.080 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Hole or Slot Quantity | 4 |
| Tapered Shoulder Minor Diameter | 1.437 INCHES MINIMUM AND 1.442 INCHES MAXIMUM IN |
| Drive Type | DRILLED HOLE |
| Drive Facility Angular Spacing in Deg | 90.0 |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Diameter | 0.062 INCHES NOMINAL IN |
| Shoulder Taper Angle in Deg | 20.0 |
| Guide Location | DRIVE EDGE |
| Guide Design | THREAD CHAMFER |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 6061 |
| Flange Thread Size | 1.6875 IN.-32 IN |
| Hole Diameter | 1.437 INCHES MINIMUM AND 1.442 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 |
|---|---|
| SMD850409 | Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc (USA) |
| Reference | Meaning |
|---|---|
| SM-D-850409 | 3/2 Design control — primary reference U.S. Government activity |
| SM-D-850409 | 5/9 Secondary reference A-I-K Inc |
NSN 5855-01-039-2857 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 5855-01-039-2857 has 1 manufacturer part number on file: SMD850409 (Freehold Manufacturing Assembly Company, Inc. Dba Freehold Manufacturing Assembly Co Inc).
Key specifications for SMD850409: Radius From Geometric Axis to Hole Center: 0.765 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN; Shoulder Length: 0.080 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Hole or Slot Quantity: 4; Tapered Shoulder Minor Diameter: 1.437 INCHES MINIMUM AND 1.442 INCHES MAXIMUM IN. 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.