The O-Ring, cataloged under National Stock Number 5331-01-306-9603, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Goriziane Group Spa. Government technical data includes 9 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-01-306-9603 |
| Primary Part Number | MS28778-12 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Goriziane Group Spa |
| Status | ACTIVE |
| Temp Rating | -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.112 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Criticality Code Justification | ZZZW |
| Elongation Percentage | 80 MAXIMUM |
| Departure From Cited Document | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Peripheral Diameter | 1.156 INCHES NOMINAL IN |
| Center Hole Diameter | 0.918 INCHES MINIMUM AND 0.930 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 | Y |
| Part Number | Manufacturer |
|---|---|
| MS28778-12 | Goriziane Group Spa (ITA) |
| Reference | Meaning |
|---|---|
| MS28778-12 | 3/1 Design control — primary reference Sae International Dba Sae International |
| 19A11-C-12-2 | 5/9 Secondary reference U.S. Government activity |
| 19A11-C-12-2 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| MS28778-12 | 5/9 Secondary reference U.S. Government activity |
| MS28778-12 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| MS28778-12 | 5/9 Secondary reference U.S. Government activity |
| 5331PL2248024 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-01-306-9603 is a O-Ring, manufactured by Goriziane Group Spa, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-306-9603 has 1 manufacturer part number on file: MS28778-12 (Goriziane Group Spa).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-624-5846. Verify interchangeability with system specifications before substitution.
Key specifications for MS28778-12: Temp Rating: -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.112 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Hardness Rating: 90.0 SHORE DUROMETER A NOMINAL; Criticality Code Justification: ZZZW. 9 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.