The O-Ring, cataloged under National Stock Number 5331-01-099-2557, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Fitzhugh Clifton Dba Hyperox Technologies. Government technical data includes 10 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through both NSN and commercial part number lookups. 16 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-01-099-2557 |
| Primary Part Number | AMS7259-012 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Fitzhugh Clifton Dba Hyperox Technologies |
| Status | ACTIVE |
| Temp Rating | -30.0 FAHRENHEIT AND 500.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Outside Diameter | 0.504 INCHES NOMINAL IN |
| Hardness Rating | 85.0 SHORE DUROMETER A MINIMUM AND 95.0 SHORE DUROMETER A MAXIMUM |
| Criticality Code Justification | ZZZW |
| Material Document and Classification | MIL-R-83248 MIL SPEC SINGLE MATERIAL RESPONSE |
| Departure From Cited Document | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Nondefinitive Spec/std Data | 1 TYPE AND 2 CLASS |
| Center Hole Diameter | 0.359 INCHES MINIMUM AND 0.369 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| AMS7259-012 | Fitzhugh Clifton Dba Hyperox Technologies (USA) |
| AS3581-012CP | Dbr Industries, Inc. Dba Dbr Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| M83248/2-012CP | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| PL7499 ITEM 81 | 5/9 Secondary reference Hale Hamilton (valves) Ltd Div Cad Uxbridge |
| M83248-2-012CP | 5/9 Secondary reference Dbr Industries, Inc. Dba Dbr Industries Inc |
| B0387 | 5/9 Secondary reference Hale Hamilton (valves) Ltd Div Cad Uxbridge |
| AS3581-012CP | 3/1 Design control — primary reference Sae International Dba Sae International |
| PL 7500 ITEM 80 | 5/9 Secondary reference Hale Hamilton (valves) Ltd Div Cad Uxbridge |
| M83248-2-012CP | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| PL7455 ITEM 60 | 5/9 Secondary reference Hale Hamilton (valves) Ltd Div Cad Uxbridge |
| M83248/2-012 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| AS3581-012CP | 5/9 Secondary reference U.S. Government activity |
| 63020 ITEM 16CP | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| M83248-2-012 | 5/9 Secondary reference U.S. Government activity |
| 5331PL0899174 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| PL7456 ITEM 60 | 5/9 Secondary reference Hale Hamilton (valves) Ltd Div Cad Uxbridge |
| 63020 ITEM 16 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS3581 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 5331-01-099-2557 is a O-Ring, manufactured by Fitzhugh Clifton Dba Hyperox Technologies, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-099-2557 has 2 manufacturer part numbers on file: AMS7259-012 (Fitzhugh Clifton Dba Hyperox Technologies), AS3581-012CP (Dbr Industries, Inc. Dba Dbr Industries Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5331-01-355-7875, 5331-01-472-9810. Verify interchangeability with system specifications before substitution.
Key specifications for AMS7259-012: Temp Rating: -30.0 FAHRENHEIT AND 500.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Outside Diameter: 0.504 INCHES NOMINAL IN; Hardness Rating: 85.0 SHORE DUROMETER A MINIMUM AND 95.0 SHORE DUROMETER A MAXIMUM. 10 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.