The Seat,valve, cataloged under National Stock Number 4820-00-533-3969, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 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 | 4820-00-533-3969 |
| Primary Part Number | 252-5A |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| Seating Surface Shape | FLAT |
| Style Designator | PLAIN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM BODY |
| Material Document and Classification | AISI 8720 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| FSC Application Data | PUMP,ROTART,HYDRAULIC SYSTEM,AIRCRAFT |
| Material | STEEL OVERALL |
| Body Inside Diameter | 0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.314 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN |
| Surface Treatment | OXIDE OVERALL |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-533-3969 is a Seat,valve, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-533-3969 has 2 cross-referenced part numbers: 252-5A (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 252-5A (Donallco Inc).
There are 2 known substitutes for 4820-00-533-3969: 1650-00-222-4525, 2520-00-802-4103. Verify interchangeability with system specifications before substitution.
Key specifications for 252-5A: Seating Surface Shape: FLAT; Style Designator: PLAIN; Hardness Rating: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM BODY; Material Document and Classification: AISI 8720 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 10 total characteristics are documented in the Federal Logistics Information System.