The O-Ring, cataloged under National Stock Number 5331-01-526-8373, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Greene Tweed & Co Inc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Greene Tweed & Co Inc (CAGE 5F573); Kalrez Usa, Llc (CAGE 0GGM9) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-526-8373 |
| Primary Part Number | A9A11301-00616 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Greene Tweed & Co Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| A9A11301-00616 PRIMARY | Greene Tweed & Co Inc (USA) |
| K92099 PRIMARY | Kalrez Usa, Llc (USA) |
| Reference | Meaning |
|---|---|
| 4074T58P55 | 1/2 Source control — Government-approved source U.S. Government activity |
| 4074T58 | D/9 Drawing number reference only U.S. Government activity |
NSN 5331-01-526-8373 is a O-Ring, manufactured by Greene Tweed & Co Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-526-8373 has 2 manufacturer part numbers on file: A9A11301-00616 (Greene Tweed & Co Inc), K92099 (Kalrez Usa, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-576-3020. Verify interchangeability with system specifications before substitution.
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.