The O-Ring, cataloged under National Stock Number 5331-01-539-6990, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Air Techniques, Inc.. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-539-6990 |
| Primary Part Number | 85527 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Air Techniques, 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 |
|---|---|
| 85527 PRIMARY | Air Techniques, Inc. (USA) |
| Reference | Meaning |
|---|---|
| LL-H58-6042 | 5/1 Secondary reference Naval Medical Material Support Command Detachment |
NSN 5331-01-539-6990 is a O-Ring, manufactured by Air Techniques, Inc., classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-539-6990 has 1 manufacturer part number on file: 85527 (Air Techniques, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 7010-01-697-1225. Verify interchangeability with system specifications before substitution.
Key specifications for 85527: Special Features: SMALL; End Item Identification: COMPRESSOR-DEHYDRATOR. 0 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.