The Seat Mechanical Sea, cataloged under National Stock Number 5331-01-543-3950, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-543-3950 |
| Primary Part Number | 1978837 ITEM 3L1 |
| Item Name | Seat Mechanical Sea |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONROL STANDARD FOR LEVEL I ITEMS |
| 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 |
|---|---|
| 1978837 ITEM 3L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 1978917L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 1978917 | 5/1 Secondary reference Northrop Grumman Systems Corporation |
| 1978837 ITEM 3 | 3/1 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5331-01-543-3950 is a Seat Mechanical Sea, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-543-3950 has 2 manufacturer part numbers on file: 1978837 ITEM 3L1 (Naval Inventory Control Point Mechanicsburg), 1978917L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 1978837 ITEM 3L1: Criticality Code Justification: ZZZY; Part Name Assigned by Controlling Agency: SEAT, MECHANICAL SEAL; End Item Identification: AB-1383/BPS-16(V) TRIDENT, RADAR MAST; AB-1382/BPS-16(V), RADAR MAST; AB-1383A/BPS-16(V), MAST ASSEMBLY A; Reference Number Differentiating Characteristics: MATERIAL CONROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONROL STANDARD FOR LEVEL I ITEMS. 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.