The Stem and Bellows Assembly, cataloged under National Stock Number 4820-00-431-9304, 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1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-431-9304 |
| Item Name | Stem and Bellows Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF BRONZE BELLOWS 1;BRASS STEM 1; SYNTHETIC RUBBER SEAT 1;SYNTHETIC RUBBER O-RING 1;BRASS FLANGE 1;PLASTIC KNOB 1;4 MTG HOLES IN FLANGE 0.170 IN.DIA;1.00 IN.C TO C,ALL HOLES 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 |
|---|---|
| 2050-016 | 5/9 Secondary reference Veeco Instruments Inc. Dba Upa Technology |
| 2050-016-03 | 5/9 Secondary reference Veeco Instruments Inc. Dba Upa Technology |
| 2050-016-03 | 3/9 Design control — primary reference Vacuum Instrument Corporation Dba Vic Leak Detection |
NSN 4820-00-431-9304 is a Stem and Bellows Assembly, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5945-01-064-6186, 5935-01-208-2650. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-431-9304: General Characteristics Item Description: CONSISTS OF BRONZE BELLOWS 1;BRASS STEM 1; SYNTHETIC RUBBER SEAT 1;SYNTHETIC RUBBER O-RING 1;BRASS FLANGE 1;PLASTIC KNOB 1;4 MTG HOLES IN FLANGE 0.170 IN.DIA;1.00 IN.C TO C,ALL HOLES IN; End Item Identification: GRUMMAN AEROSPACE A10 AIRCRAFT. 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 4820-00-431-9304 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.