The Reference Standard Set,physical, cataloged under National Stock Number 6635-01-321-3321, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6635-01-321-3321 |
| Item Name | Reference Standard Set,physical |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| 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 |
| Reference | Meaning |
|---|---|
| 225513 | 3/9 Design control — primary reference Illinois Tool Works, Inc. Div Magnaflux |
NSN 6635-01-321-3321 is a Reference Standard Set,physical, classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6810-01-518-0736. Verify interchangeability with system specifications before substitution.
Key specifications for 6635-01-321-3321: End Item Identification: MODEL FM-150 SAMPLE CONDUCTOR. 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.