The Disc Locknut,valve, cataloged under National Stock Number 4820-01-177-0002, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-177-0002 |
| Item Name | Disc Locknut,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | 1.250 IN. WIDTH ACROSS FLATS,0.812 IN. LG,THREADED ONE END 1.000-20 NEF-2B 0.609 IN. DEEP IN |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| F-58779CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 21F58779-175-00 | C/1 Advisory reference — outside the item-of-supply concept William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| 21F58779-175-00CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| F-58779 | 3/1 Design control — primary reference William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
NSN 4820-01-177-0002 is a Disc Locknut,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-177-0002: General Characteristics Item Description: 1.250 IN. WIDTH ACROSS FLATS,0.812 IN. LG,THREADED ONE END 1.000-20 NEF-2B 0.609 IN. DEEP IN; Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. 3 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.