The O-Ring, cataloged under National Stock Number 5331-01-312-7662, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | The Boeing Company (CAGE 8V613) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-312-7662 |
| Primary Part Number | 7-311527068-17 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Cross-Sectional Height | 0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN |
| Center Hole Diameter | 9.005 INCHES MINIMUM AND 9.030 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 | X |
| Part Number | Manufacturer |
|---|---|
| 7-311527068-17 | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| 7-311527068-17 | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| 29980-2108 | 5/9 Secondary reference Precision Seals Inc |
| 558519 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5331-01-312-7662 is a O-Ring, manufactured by The Boeing Company, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-312-7662 has 1 manufacturer part number on file: 7-311527068-17 (The Boeing Company).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-542-4933, 5340-01-588-4015. Verify interchangeability with system specifications before substitution.
Key specifications for 7-311527068-17: Cross-Sectional Height: 0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN; Center Hole Diameter: 9.005 INCHES MINIMUM AND 9.030 INCHES MAXIMUM IN. 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.