The Seat,valve, cataloged under National Stock Number 4820-00-975-7128, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Woodward Hrt Inc. Government technical data includes 13 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-975-7128 |
| Primary Part Number | 42576 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Woodward Hrt Inc |
| Status | ACTIVE |
| Seating Surface Shape | ANGULAR |
| Seat Angle in Deg | 90.000 NOMINAL |
| Flange Diameter | 0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Under Flange Height | 0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN |
| Body Stepped Inside Diameter | 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM FIRST STEP IN |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL |
| Body Stepped Inside Diameter | 0.250 INCHES NOMINAL SECOND STEP IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Material Document and Classification | QQ-S-763,CLASS 440C FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Flange Seat to Disk End Height | 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-975-7128 is a Seat,valve, manufactured by Woodward Hrt Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-975-7128 has 2 cross-referenced part numbers: 975-7128 (Marine Diesel, Inc. Dba Marine Diesel), 42576 (Woodward Hrt Inc).
There are 4 known substitutes for 4820-00-975-7128: 5330-00-179-0910, 4920-00-838-6265, 5950-01-019-5303 and 1 more. Verify interchangeability with system specifications before substitution.
Key specifications for 42576: Seating Surface Shape: ANGULAR; Seat Angle in Deg: 90.000 NOMINAL; Flange Diameter: 0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN; Body Outside Diameter: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN. 14 total characteristics are documented in the Federal Logistics Information System.