The Valve,restrictor Check, cataloged under National Stock Number 4820-01-181-5766, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Crissair Inc Div Esco Technologies. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-181-5766 |
| Primary Part Number | 6F3256 |
| Item Name | Valve,restrictor Check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Crissair Inc Div Esco Technologies |
| Status | ACTIVE |
| Valve Operation Method | AUTOMATIC |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Flow Control Device | POPPET |
| Thread Class | 3A FIRST END A |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Disk Loading Method | SPRING |
| Material | STEEL BODY |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 5590-151 | The Boeing Company Div Defense (USA) |
| 6F3256 PRIMARY | Crissair Inc Div Esco Technologies (USA) |
| 236251 | The Boeing Company Div Defense (USA) |
| 5590 | The Boeing Company Div Defense (USA) |
| B3160 PRIMARY | Preece Inc Decca Valves Div (USA) |
| A254615 | The Boeing Company Div Defense (USA) |
| 286251 | The Boeing Company Div Defense (USA) |
NSN 4820-01-181-5766 is a Valve,restrictor Check, manufactured by Crissair Inc Div Esco Technologies, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-181-5766 has 7 cross-referenced part numbers: 5590-151 (The Boeing Company Div Defense), 6F3256 (Crissair Inc Div Esco Technologies), 236251 (The Boeing Company Div Defense), 5590 (The Boeing Company Div Defense), B3160 (Preece Inc Decca Valves Div) and 2 more.
There are 12 known substitutes for 4820-01-181-5766: 8110-00-030-7780, 3110-00-100-6186, 2520-00-225-1445 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 6F3256: Valve Operation Method: AUTOMATIC; Connection Type: THREADED EXTERNAL TUBE ALL ENDS; Nominal Thread Size: 0.562 INCHES FIRST END IN; Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END. 10 total characteristics are documented in the Federal Logistics Information System.