The Tightening Bolt Ay, cataloged under National Stock Number 4420-01-504-9052, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-504-9052 |
| Item Name | Tightening Bolt Ay |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| 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 |
|---|---|
| 4-750-31-131-001 PC NO.4 | C/1 Advisory reference — outside the item-of-supply concept Fluid Handling Llc |
| 4-750-31-131-001 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 4-750-31-131-001 PC NO.4 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4-669-24-200-010 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 4-669-24-200-010 | 5/9 Secondary reference Xylem Inc. |
| 4-669-24-200-010 | C/1 Advisory reference — outside the item-of-supply concept Fluid Handling Llc |
NSN 4420-01-504-9052 is a Tightening Bolt Ay, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4420-01-504-9089. Verify interchangeability with system specifications before substitution.
Key specifications for 4420-01-504-9052: Part Name Assigned by Controlling Agency: STAYBOLT TIGHTENING ASSEMBLY; End Item Identification: PF 42 CENTRAL FRESH WATER COOLER. 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.