The O-Ring, cataloged under National Stock Number 5331-01-526-6261, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Kalrez Usa, Llc. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-526-6261 |
| Primary Part Number | K90301 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Kalrez Usa, Llc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.131 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Criticality Code Justification | AGAV |
| Center Hole Diameter | 4.555 INCHES MINIMUM AND 4.615 INCHES MAXIMUM IN |
| Material | RUBBER SILICONE CLASS Q |
| 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 |
|---|---|
| K90301 | Kalrez Usa, Llc (USA) |
| A9A24701-00616 | Greene Tweed & Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 4074T58P57 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5331-01-526-6261 is a O-Ring, manufactured by Kalrez Usa, Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-526-6261 has 2 manufacturer part numbers on file: K90301 (Kalrez Usa, Llc), A9A24701-00616 (Greene Tweed & Co Inc).
Key specifications for K90301: Cross-Sectional Height: 0.131 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Criticality Code Justification: AGAV; Special Features: NEXT HIGHER ASSY IS NSN 2840-01-526-5791; POWER TURBINE ASSY. 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.