The Plate,restrictor, cataloged under National Stock Number 4820-01-204-8451, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-204-8451 |
| Item Name | Plate,restrictor |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | CAST NICKEL COPPER QQ-N-288 COMP E;O/A OD 12.368 IN.;ID 9.438 IN.;CONCAVE TO A 0.500 IN. RADIUS;1.000 IN. THICK;58 HOLES 1.062 IN. DIA SYMMETRICAL ABOUT CENTERLINE IN THREE DIFFERENT DETAIL PATTERNS;MEDIA SEAWATER IN |
| 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 |
|---|---|
| 83553-78X3 | D/9 Drawing number reference only U.S. Government activity |
| SSBN654-209-2147527 PIECE 27 | 5/9 Secondary reference U.S. Government activity |
| SSBN608-209-2472787 | D/9 Drawing number reference only U.S. Government activity |
| 76553-78-24 | D/9 Drawing number reference only U.S. Government activity |
| SSBN654-209-2147527 | D/9 Drawing number reference only U.S. Government activity |
| SSBN608-209-2472787 PIECE 27 | 5/2 Secondary reference U.S. Government activity |
| 83553-78X3 PIECE 27 | 3/2 Design control — primary reference U.S. Government activity |
| 76553-78X24 PIE | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 76553-78-24 PIECE 27 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-204-8451 is a Plate,restrictor, classified under FSC 4820, Valves, Nonpowered. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-209-0894, 3010-01-210-1385, 3010-01-210-1386. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-204-8451: General Characteristics Item Description: CAST NICKEL COPPER QQ-N-288 COMP E;O/A OD 12.368 IN.;ID 9.438 IN.;CONCAVE TO A 0.500 IN. RADIUS;1.000 IN. THICK;58 HOLES 1.062 IN. DIA SYMMETRICAL ABOUT CENTERLINE IN THREE DIFFERENT DETAIL PATTERNS;MEDIA SEAWATER IN. 1 specification is 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.