The Seat,valve, cataloged under National Stock Number 4820-00-031-7453, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Defense & Development Enterprises Llc. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-031-7453 |
| Primary Part Number | 21549-1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Defense & Development Enterprises Llc |
| Status | ACTIVE |
| Body Outside Diameter | 0.495 INCHES NOMINAL IN |
| Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | QQ-S-763 CL 6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material | STEEL COMP 416 OVERALL |
| FSC Application Data | VALVE |
| Style Designator | PLAIN FLANGED |
| Under Flange Height | 0.232 INCHES NOMINAL IN |
| Flange Diameter | 0.656 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 0.048 INCHES NOMINAL IN |
| Body Inside Diameter | 0.315 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-031-7453 is a Seat,valve, manufactured by Defense & Development Enterprises Llc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-031-7453 has 3 cross-referenced part numbers: 21549-1 (Defense & Development Enterprises Llc), KC4070 (Kendall Controls Corp), 21549-1 (Triumph Thermal Systems - Maryland, Inc.).
There are 3 known substitutes for 4820-00-031-7453: 1650-00-992-3676, 6130-01-137-1286, 3040-01-317-7491. Verify interchangeability with system specifications before substitution.
Key specifications for 21549-1: Body Outside Diameter: 0.495 INCHES NOMINAL IN; Hardness Rating: 28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL; Material Document and Classification: QQ-S-763 CL 6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material: STEEL COMP 416 OVERALL. 11 total characteristics are documented in the Federal Logistics Information System.