The O-Ring, cataloged under National Stock Number 5331-01-255-1846, 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 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-255-1846 |
| Primary Part Number | 501-4555457 ITEM 8CP |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| 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 |
|---|---|
| 501-4555457 ITEM 8CP | Naval Inventory Control Point Mechanicsburg (USA) |
| 2730-145 ITEM 8CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2730-145 ITEM 8 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 501-4555457 ITE | C/1 Advisory reference — outside the item-of-supply concept Huntington Ingalls Inc Div Newport News Shipbuilding |
| 501-4555457 ITEM 8 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5331-01-255-1846 is a O-Ring, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-255-1846 has 2 manufacturer part numbers on file: 501-4555457 ITEM 8CP (Naval Inventory Control Point Mechanicsburg), 2730-145 ITEM 8CP (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-266-0584. Verify interchangeability with system specifications before substitution.
Key specifications for 501-4555457 ITEM 8CP: Criticality Code Justification: ZZZY; Material: PLASTIC POLYTETRAFLUOROETHYLENE; Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. 3 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.