The O-Ring, cataloged under National Stock Number 5331-01-398-8776, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 3 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-398-8776 |
| Primary Part Number | 6561921 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Cross-Sectional Height | 0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| 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 |
|---|---|
| 6561921 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5331-01-398-8776 is a O-Ring, manufactured by Naval Sea Systems Command, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-398-8776 has 1 manufacturer part number on file: 6561921 (Naval Sea Systems Command).
Key specifications for 6561921: Cross-Sectional Height: 0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN; Special Features: SUGGESTED SOURCES OF SUPLY PARKER-HANNIFIN AND PRECISION RUBBER PRODUCTS; Center Hole Diameter: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR. 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.