The Stud,closure, cataloged under National Stock Number 4470-00-273-1889, is classified within Federal Supply Class 4470 (Nuclear Reactors) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4470-00-273-1889 |
| Item Name | Stud,closure |
| FSC / FSG | 4470 / 44 — Nuclear Reactors |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS. |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 820-4384426-8 | 5/1 Secondary reference U.S. Government activity |
| 264902E MK 30-8 | 5/9 Secondary reference U.S. Government activity |
| 495846 PT 275220 | 5/1 Secondary reference Curtiss-Wright Controls, Inc. Div Actuation Division |
| NF-42242PC8104 | 5/1 Secondary reference Amec Foster Wheeler North America Corp. Dba Foster Wheeler |
| 28576F PC 30-8 | 5/9 Secondary reference U.S. Government activity |
| 493037 PC 273590 | 5/9 Secondary reference Instruments and Flight Research, Inc. |
| 71-02-31139E12IT40 | 3/1 Design control — primary reference Struthers Wells Corp |
| 26878FMK325 | 5/9 Secondary reference U.S. Government activity |
| 66-2-5491E3PC7-6 | 5/1 Secondary reference Struthers Wells Corp |
| 820-4384426PC8 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4470-00-273-1889 is a Stud,closure, classified under FSC 4470, Nuclear Reactors. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5307-01-667-3375. Verify interchangeability with system specifications before substitution.
Key specifications for 4470-00-273-1889: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.. 2 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.
NSN 4470-00-273-1889 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.