The O-Ring, cataloged under National Stock Number 5331-01-697-0644, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is King Instrument Company, Inc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-01-697-0644 |
| Primary Part Number | OR020VT |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | King Instrument Company, 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 |
|---|---|
| OR020VT PRIMARY | King Instrument Company, Inc (USA) |
| Reference | Meaning |
|---|---|
| AS-7710-712 REV B ITEM 6 | 5/1 Secondary reference King Instrument Company, Inc |
| AS-7710-712 REV B | D/9 Drawing number reference only King Instrument Company, Inc |
NSN 5331-01-697-0644 is a O-Ring, manufactured by King Instrument Company, Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-697-0644 has 1 manufacturer part number on file: OR020VT (King Instrument Company, Inc).
1 possible match (shared part number, not a government interchangeability claim): 6680-01-697-2035. Verify interchangeability with system specifications before substitution.
Key specifications for OR020VT: End Item Identification: FLOWMETER, 4. 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.