The Seat,valve, cataloged under National Stock Number 4820-01-098-1688, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Eaton Aerospace Llc. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-098-1688 |
| Primary Part Number | 25757 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Eaton Aerospace Llc |
| Status | ACTIVE |
| Body Stepped Inside Diameter | 0.156 INCHES NOMINAL FIRST STEP IN |
| Seating Surface Shape | FLAT |
| Material | STEEL COMP 440C OVERALL |
| Style Designator | PLAIN |
| Seal Accommodation Type | GROOVED |
| Body Outside Diameter | 0.420 INCHES NOMINAL IN |
| Body Stepped Inside Diameter | 0.188 INCHES NOMINAL SECOND STEP IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 25757 PRIMARY | Eaton Aerospace Llc (USA) |
NSN 4820-01-098-1688 is a Seat,valve, manufactured by Eaton Aerospace Llc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-098-1688 has 1 cross-referenced part number: 25757 (Eaton Aerospace Llc).
There are 7 known substitutes for 4820-01-098-1688: 5950-00-347-1763, 5360-00-360-4410, 5330-00-374-9275 and 4 more. Verify interchangeability with system specifications before substitution.
Key specifications for 25757: Body Stepped Inside Diameter: 0.156 INCHES NOMINAL FIRST STEP IN; Overall Height: 0.400 INCHES NOMINAL IN; Seating Surface Shape: FLAT; Material: STEEL COMP 440C OVERALL. 8 total characteristics are documented in the Federal Logistics Information System.