The Valve,check, cataloged under National Stock Number 4820-01-444-3281, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-444-3281 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Bolt Circle Nominal Diameter | 0.540 INCHES FIRST END IN |
| Supplementary Features | NO LEAKAGE PERMISSABLE WHEN VALVE IS CLOSED, MAXIMUM WEIGHT SHALL NOT EXCEED .10LBS LBS |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Face to Face Distance | 1.650 INCHES IN |
| Thread Class | 3A FIRST END A |
| Thread Quantity Per Inch | 16 FIRST END |
| Material | STEEL COMP 303 STEM |
| Material | RUBBER SYNTHETIC PACKING |
| Material | PLASTIC POLYAMIDE NYLON FLOW CONTROL DEVICE |
| Material | ALUMINUM ALLOY 2011 OR ALUMINUM ALLOY 2017 OR ALUMINUM ALLOY 2024 BODY |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Reference | Meaning |
|---|---|
| 901-344-567 | 1/2 Source control — Government-approved source U.S. Government activity |
| 901-344-567-101 | 3/2 Design control — primary reference U.S. Government activity |
| 2G7150 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-444-3281 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-444-3281: Bolt Circle Nominal Diameter: 0.540 INCHES FIRST END IN; Supplementary Features: NO LEAKAGE PERMISSABLE WHEN VALVE IS CLOSED, MAXIMUM WEIGHT SHALL NOT EXCEED .10LBS LBS; Nominal Thread Size: 0.750 INCHES FIRST END IN; Special Features: MATERIAL: HOUSING AND PLUG GRIP:2011-T3,2017-T4,2024-T4 OR 8061-T6 AL ALY, VALVE: PLASTIC UNFILLED,SEALS: ALL ELASTOMERIC ELEMENTS PER MIL-R-83248, TYPE I CLASS 2, CRES LOCKING PINS: 303 STAINLESS STEEL. 11 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.