The Variable Orifice, cataloged under National Stock Number 4820-01-085-4998, 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1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-085-4998 |
| Item Name | Variable Orifice |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL CRES QQ-S-763 CL304 CONDITION A; 2 IDENTICAL FLUID ENDS; UNTHREADED INTERNAL PIPE; ACCOMODATES 0.500 IN. NOMINAL PIPE; WORKING PRESSURE 3000.0 PSI; WORKING TEMP 0.0 DEG F TO 180.0 DEG F; STEM HAS HEXAGONAL WRENCHING FEATURE; DISTANCE ACROSS FLATS 0.370 IN.; LENGTH 6.250 IN.; WIDTH 1.375 IN.; FURNISHED W/PLATE AND LOCKING SCREW; ORIFICE 0.500 IN. 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 |
|---|---|
| 18-97-1255 | 3/2 Design control — primary reference U.S. Government activity |
| 845-4558748 | D/9 Drawing number reference only U.S. Government activity |
| 845-4558748ASSYC | 3/2 Design control — primary reference U.S. Government activity |
| 2642-799-01ASSYC | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-085-4998 is a Variable Orifice, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-160-8244. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-085-4998: General Characteristics Item Description: MATERIAL CRES QQ-S-763 CL304 CONDITION A; 2 IDENTICAL FLUID ENDS; UNTHREADED INTERNAL PIPE; ACCOMODATES 0.500 IN. NOMINAL PIPE; WORKING PRESSURE 3000.0 PSI; WORKING TEMP 0.0 DEG F TO 180.0 DEG F; STEM HAS HEXAGONAL WRENCHING FEATURE; DISTANCE ACROSS FLATS 0.370 IN.; LENGTH 6.250 IN.; WIDTH 1.375 IN.; FURNISHED W/PLATE AND LOCKING SCREW; ORIFICE 0.500 IN. 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.