The O-Ring, cataloged under National Stock Number 5331-01-511-2660, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Aqua-Chem, Inc. Dba Aqua-Chem Inc. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (CAGE 0EXU3) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-511-2660 |
| Primary Part Number | 853-9997 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Aqua-Chem, Inc. Dba Aqua-Chem 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 | X |
| Part Number | Manufacturer |
|---|---|
| 843-C-8043 ITEM 1 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 853-9997 PRIMARY | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 853-9997-000 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| Reference | Meaning |
|---|---|
| 843-C-8043 | D/9 Drawing number reference only Aqua-Chem, Inc. Dba Aqua-Chem Inc |
NSN 5331-01-511-2660 is a O-Ring, manufactured by Aqua-Chem, Inc. Dba Aqua-Chem Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-511-2660 has 3 manufacturer part numbers on file: 843-C-8043 ITEM 1 (Aqua-Chem, Inc. Dba Aqua-Chem Inc), 853-9997 (Aqua-Chem, Inc. Dba Aqua-Chem Inc), 853-9997-000 (Aqua-Chem, Inc. Dba Aqua-Chem Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5331-01-511-2681, 5331-01-511-2736. 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.