The O-Ring, cataloged under National Stock Number 5331-00-841-8564, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-00-841-8564 |
| Primary Part Number | MS29561-254 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Cross-Sectional Height | 0.139 INCHES NOMINAL IN |
| Outside Diameter | 5.762 INCHES NOMINAL IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Elongation Percentage | 250 MAXIMUM |
| Center Hole Diameter | 5.461 INCHES MINIMUM AND 5.507 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 |
|---|---|
| 137616154 | Leonardo S.p.a. - Electronics Division - Defence Business Area (ITA) |
| MS29561-254 PRIMARY | Sae International Dba Sae International (USA) |
| MS29561-254 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| MS29561-254 | Goriziane Group Spa (ITA) |
| Reference | Meaning |
|---|---|
| STD3000C59 | 5/1 Secondary reference U.S. Government activity |
| 2-254 N4771-70 | 5/9 Secondary reference Parker Hannifin Gmbh O-Ring Division |
| PRP1847&254 | C/1 Advisory reference — outside the item-of-supply concept Parker Hannifin Corporation Div O-Ring Division |
| SAE-AS29561 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS29561-254 | 5/9 Secondary reference U.S. Government activity |
| 2-254 47-071 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 5331PL0810436 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-00-841-8564 is a O-Ring, manufactured by Sae International Dba Sae International, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-841-8564 has 4 manufacturer part numbers on file: 137616154 (Leonardo S.p.a. - Electronics Division - Defence Business Area), MS29561-254 (Sae International Dba Sae International), MS29561-254 (Leonardo Spa Helicopters Division - Production Site), MS29561-254 (Goriziane Group Spa).
Key specifications for MS29561-254: Cross-Sectional Height: 0.139 INCHES NOMINAL IN; Outside Diameter: 5.762 INCHES NOMINAL IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Elongation Percentage: 250 MAXIMUM. 6 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.