The Tightening Bolt Ay, cataloged under National Stock Number 4420-01-504-9089, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Tightening Bolt Ay |
| FSC / FSG | 4420 — Heat Exchangers and Steam Condensers (FSG 44) |
| Parameter | Value |
|---|---|
| NSN | 4420-01-504-9089 |
| 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 |
|---|---|
| 4-669-24-200-011 | C/1 Advisory reference — outside the item-of-supply concept Fluid Handling Llc |
| 4-750-31-131-001 PC NO.5 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4-750-31-131-001 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 4-669-24-200-011 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 4-750-31-131-001 PC NO.5 | C/1 Advisory reference — outside the item-of-supply concept Fluid Handling Llc |
NSN 4420-01-504-9089 is a Tightening Bolt Ay, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
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.