The O-Ring, cataloged under National Stock Number 5331-01-507-9057, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Freudenberg-Nok General Partnership. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-507-9057 |
| Primary Part Number | 2532499-243 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Freudenberg-Nok General Partnership |
| Status | ACTIVE |
| Cross-Sectional Height | 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Hardness Rating | 87.0 SHORE DUROMETER A MINIMUM AND 97.0 SHORE DUROMETER A MAXIMUM |
| Center Hole Diameter | 4.094 INCHES MINIMUM AND 4.124 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 2532499-243 PRIMARY | Freudenberg-Nok General Partnership (USA) |
| 2532499-243 | Bae Systems Land & Armaments L.p. (USA) |
| Reference | Meaning |
|---|---|
| 2532499-243 | 5/9 Secondary reference Naval Sea Systems Command |
| 2532499-243 | 5/2 Secondary reference U.S. Government activity |
| 2532499-243 | 7/2 Vendor item drawing reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 5331-01-507-9057 is a O-Ring, manufactured by Freudenberg-Nok General Partnership, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-507-9057 has 2 manufacturer part numbers on file: 2532499-243 (Freudenberg-Nok General Partnership), 2532499-243 (Bae Systems Land & Armaments L.p.).
Key specifications for 2532499-243: Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Hardness Rating: 87.0 SHORE DUROMETER A MINIMUM AND 97.0 SHORE DUROMETER A MAXIMUM; Center Hole Diameter: 4.094 INCHES MINIMUM AND 4.124 INCHES MAXIMUM IN; Material: RUBBER SYNTHETIC. 4 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.