The Seat,valve, cataloged under National Stock Number 4820-00-063-8911, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Steward Machine Co Inc. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-063-8911 |
| Primary Part Number | 620-608 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Steward Machine Co Inc |
| Status | ACTIVE |
| Under Flange Height | 0.188 INCHES NOMINAL IN |
| Seat Angle in Deg | 30.000 NOMINAL |
| Material | COBALT ALLOY FACE |
| Seating Surface Shape | ANGULAR |
| Body Inside Diameter | 1.290 INCHES MINIMUM AND 1.292 INCHES MAXIMUM IN |
| Hardness Rating | 202.0 BRINELL STANDARD NOMINAL BODY |
| Material | STEEL COMP 410 BODY |
| Style Designator | PLAIN FLANGED |
| Hardness Rating | 202.0 BRINELL STANDARD NOMINAL FACE |
| Body Outside Diameter | 2.315 INCHES MINIMUM AND 2.320 INCHES MAXIMUM IN |
| Flange Seat to Disk End Height | 0.750 INCHES NOMINAL IN |
| Flange Diameter | 2.805 INCHES MINIMUM AND 2.810 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 620-608 PRIMARY | Steward Machine Co Inc (USA) |
| 620-608 | Hardie-Tynes Co., Inc. (USA) |
| 60-620PC608 | Hardie-Tynes Co., Inc. (USA) |
NSN 4820-00-063-8911 is a Seat,valve, manufactured by Steward Machine Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-063-8911 has 3 cross-referenced part numbers: 620-608 (Steward Machine Co Inc), 620-608 (Hardie-Tynes Co., Inc.), 60-620PC608 (Hardie-Tynes Co., Inc.).
There are 2 known substitutes for 4820-00-063-8911: 3020-00-251-0865, 2990-01-261-5430. Verify interchangeability with system specifications before substitution.
Key specifications for 620-608: Under Flange Height: 0.188 INCHES NOMINAL IN; Seat Angle in Deg: 30.000 NOMINAL; Material: COBALT ALLOY FACE; Seating Surface Shape: ANGULAR. 12 total characteristics are documented in the Federal Logistics Information System.