The O-Ring, cataloged under National Stock Number 5331-01-287-4819, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Leonardo S.p.a. - Electronics Division - Defence Business Area. Government technical data includes 4 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-287-4819 |
| Primary Part Number | 127606636 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Leonardo S.p.a. - Electronics Division - Defence Business Area |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZW |
| Departure From Cited Document | REQUIRES SPECIAL CLEANING AND PACKAGING IAW MIL-STD-1330,FOR 0XYGEN/NITROGEN/HYDROGEN SERVICE |
| Center Hole Diameter | 2.290 INCHES MINIMUM AND 2.310 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 127606636 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| 230079071 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| Reference | Meaning |
|---|---|
| SAE-AS28775 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS28775-141 | 5/9 Secondary reference U.S. Government activity |
| A180-141 | 5/1 Secondary reference U.S. Government activity |
| MS28775-141CP | 5/9 Secondary reference U.S. Government activity |
| MS28775-141CP | 3/1 Design control — primary reference Sae International Dba Sae International |
| 5331PL0166454 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-01-287-4819 is a O-Ring, manufactured by Leonardo S.p.a. - Electronics Division - Defence Business Area, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-287-4819 has 2 manufacturer part numbers on file: 127606636 (Leonardo S.p.a. - Electronics Division - Defence Business Area), 230079071 (Leonardo S.p.a. - Electronics Division - Defence Business Area).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-398-7469. Verify interchangeability with system specifications before substitution.
Key specifications for 127606636: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Criticality Code Justification: ZZZW; Departure From Cited Document: REQUIRES SPECIAL CLEANING AND PACKAGING IAW MIL-STD-1330,FOR 0XYGEN/NITROGEN/HYDROGEN SERVICE; Center Hole Diameter: 2.290 INCHES MINIMUM AND 2.310 INCHES MAXIMUM IN. 4 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.