The Seat,valve, cataloged under National Stock Number 4820-01-540-8802, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Ship Systems Command. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, 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 | 4820-01-540-8802 |
| Primary Part Number | 803-1385637-08X-08 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Naval Ship Systems Command |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 1.094 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| Material Document and Classification | ASTM A494 GR -30C ASSN STD SINGLE MATERIAL RESPONSE OR QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Style Designator | THREADED FLANGED |
| Seating Surface Shape | FLAT |
| Body Inside Diameter | 7.938 INCHES NOMINAL IN |
| Material | NICKEL ALLOY OVERALL |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Length | 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Under Flange Height | 0.750 INCHES NOMINAL IN |
| Flange Diameter | 9.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 1385637 | Naval Ship Systems Command (USA) |
| 803-1385637-08X-08 PRIMARY | Naval Ship Systems Command (USA) |
NSN 4820-01-540-8802 is a Seat,valve, manufactured by Naval Ship Systems Command, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-540-8802 has 2 cross-referenced part numbers: 1385637 (Naval Ship Systems Command), 803-1385637-08X-08 (Naval Ship Systems Command).
There are 12 known substitutes for 4820-01-540-8802: 4820-00-058-3630, 4820-00-243-6698, 4820-00-878-4325 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 803-1385637-08X-08: Flange Seat to Disk End Height: 1.094 INCHES NOMINAL IN; Thread Quantity Per Inch: 12 SINGLE THREADED PORTION; Thread Series Designator: UNS SINGLE THREADED PORTION; Material Document and Classification: ASTM A494 GR -30C ASSN STD SINGLE MATERIAL RESPONSE OR QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 14 total characteristics are documented in the Federal Logistics Information System.