The O-Ring, cataloged under National Stock Number 5331-01-539-6397, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Greene Tweed & Co Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-539-6397 |
| Primary Part Number | 722A8MS-772-9173 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Greene Tweed & Co Inc |
| Status | ACTIVE |
| Temp Rating | -350.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.139 INCHES NOMINAL IN |
| Hardness Rating | 60.0 SHORE DUROMETER D NOMINAL |
| Center Hole Diameter | 2.248 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 |
|---|---|
| 722A8MS-772-9173 | Greene Tweed & Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 722A8MS-777-9173 | 3/9 Design control — primary reference Greene Tweed & Co Inc |
NSN 5331-01-539-6397 is a O-Ring, manufactured by Greene Tweed & Co Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-539-6397 has 1 manufacturer part number on file: 722A8MS-772-9173 (Greene Tweed & Co Inc).
Key specifications for 722A8MS-772-9173: Temp Rating: -350.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.139 INCHES NOMINAL IN; Hardness Rating: 60.0 SHORE DUROMETER D NOMINAL; Special Features: NON STANDARD SIZE WITH SOLDI BACK UP. 5 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.