The Cover,operator,valve, cataloged under National Stock Number 4820-01-121-9546, 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1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-121-9546 |
| Item Name | Cover,operator,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL BRONZE,MIL-B-23921;11.500 IN. OD;1.125 IN. ID;1.719 IN. THK;TEN 0.281 IN. DIA HOLES EQUALLY SPACED ON A 11.000 IN. DIA BOLT CIRCLE;FOUR 0.125 IN. DIA HOLES EQUALLY SPACED ON A 8.000 IN. DIA BOLT CIRCLE;THREE THREADED HOLES EQUALLY SPACED ON A 1.750 IN. DIA BOLT CIRCLE 8-32 UNC 2B THDS;ONE THREADED HOLE 0.125-18 NPTF INTERNAL PIPE THDS SET AT A 45 DEG ANGLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2640-635-10 ITEM 2 | 3/2 Design control — primary reference U.S. Government activity |
| 2640-635-10 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-121-9546 is a Cover,operator,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-121-9546: General Characteristics Item Description: MATERIAL BRONZE,MIL-B-23921;11.500 IN. OD;1.125 IN. ID;1.719 IN. THK;TEN 0.281 IN. DIA HOLES EQUALLY SPACED ON A 11.000 IN. DIA BOLT CIRCLE;FOUR 0.125 IN. DIA HOLES EQUALLY SPACED ON A 8.000 IN. DIA BOLT CIRCLE;THREE THREADED HOLES EQUALLY SPACED ON A 1.750 IN. DIA BOLT CIRCLE 8-32 UNC 2B THDS;ONE THREADED HOLE 0.125-18 NPTF INTERNAL PIPE THDS SET AT A 45 DEG ANGLE IN; End Item Identification: MANUAL OPERATOR ASSEMBLY 3 PORT VALVE MODEL 2640-635-10. 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.
NSN 4820-01-121-9546 has DEMIL Code Q. 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.