The Disk Assembly, cataloged under National Stock Number 4820-01-056-1687, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mission Systems Orchard Park Inc. Government technical data includes 2 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-056-1687 |
| Primary Part Number | 1970-502 3-3CP |
| Item Name | Disk Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mission Systems Orchard Park Inc |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 1970-502 3-3CP | Mission Systems Orchard Park Inc (USA) |
| 1970-002 ITEM 02 | Mission Systems Orchard Park Inc (USA) |
| 1970 002NV-1S FIND2CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| PL1970 002NV-2A FIND 2CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 1970-002 ITEM 02 | 5/9 Secondary reference Carleton Technologies Inc Div Tampa Facility |
| PL1970 002NV-1A FIND 2CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| PL1970 002NV-2A FIND 2 | 5/9 Secondary reference Mission Systems Orchard Park Inc |
| 19705023-3CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| PL1790 002NV-1A FIND 2 | 5/9 Secondary reference Mission Systems Orchard Park Inc |
| 1970-502 3-3CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 19705023-3 | 3/1 Design control — primary reference Mission Systems Orchard Park Inc |
NSN 4820-01-056-1687 is a Disk Assembly, manufactured by Mission Systems Orchard Park Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-056-1687 has 3 manufacturer part numbers on file: 1970-502 3-3CP (Mission Systems Orchard Park Inc), 1970-002 ITEM 02 (Mission Systems Orchard Park Inc), 1970 002NV-1S FIND2CP (Naval Inventory Control Point Mechanicsburg).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-192-5638, 4820-01-486-8491, 4820-01-541-4342. Verify interchangeability with system specifications before substitution.
Key specifications for 1970-502 3-3CP: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. 2 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.