The O-Ring, cataloged under National Stock Number 5331-01-331-5373, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-331-5373 |
| Primary Part Number | MS9955-013 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.073 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.431 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MS9955-013 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| MS9955-013 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS9955-013 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS9955 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS9955-013 | 5/9 Secondary reference U.S. Government activity |
NSN 5331-01-331-5373 is a O-Ring, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-331-5373 has 2 manufacturer part numbers on file: MS9955-013 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), MS9955-013 (Sae International Dba Sae International).
4 possible matches (shared part number, not a government interchangeability claim): 5331-01-374-2325, 5331-01-398-4993, 5331-01-398-4995. Verify interchangeability with system specifications before substitution.
Key specifications for MS9955-013: Cross-Sectional Height: 0.073 INCHES MAXIMUM IN; Special Features: O-RING SHAPE; Center Hole Diameter: 0.431 INCHES MAXIMUM IN; Material: PLASTIC POLYTETRAFLUOROETHYLENE. 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.