The Retainer,optical Element, cataloged under National Stock Number 1240-01-173-9839, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1240-01-173-9839 |
| Primary Part Number | 82A5027A1529 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service |
| Status | ACTIVE |
| Hole or Slot Quantity | 1 |
| Drive Type | DRILLED HOLE |
| Style Designator | RECESSED |
| Material Document and Classification | WW-T-700/6, T6, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE |
| Recess Depth | 2.9 MILLIMETERS NOMINAL MM |
| Recess Diameter | 35.8 MILLIMETERS NOMINAL MM |
| Thread Size | 1.687 IN.-32 IN |
| Material | ALUMINUM ALLOY 6061 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 82A5027A1529 PRIMARY | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service (USA) |
| 82A5027A1529 | Seiler Instrument and Manufacturing Company, Incorporated (USA) |
| Reference | Meaning |
|---|---|
| 82A5027A1529 | 5/9 Secondary reference L3 Technologies, Inc. Dba Insight Technology Division Div Insight Technology Division |
NSN 1240-01-173-9839 is a Retainer,optical Element, manufactured by Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-173-9839 has 2 manufacturer part numbers on file: 82A5027A1529 (Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service), 82A5027A1529 (Seiler Instrument and Manufacturing Company, Incorporated).
Key specifications for 82A5027A1529: Hole or Slot Quantity: 1; Drive Type: DRILLED HOLE; Style Designator: RECESSED; Material Document and Classification: WW-T-700/6, T6, TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE. 8 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.
NSN 1240-01-173-9839 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.