The Seat,valve, cataloged under National Stock Number 4820-00-036-1985, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 13 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-036-1985 |
| Primary Part Number | 76-S-104 PIECE 4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.688 INCHES NOMINAL IN |
| Under Flange Height | 1.875 INCHES NOMINAL IN |
| Thread Length | 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Nominal Thread Size | 4.250 INCHES SINGLE THREADED PORTION IN |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Style Designator | THREADED FLANGED |
| Flange Diameter | 4.250 INCHES NOMINAL IN |
| Seating Surface Shape | ANGULAR |
| Material | STEEL OVERALL |
| Body Inside Diameter | 3.375 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 83757 | Ashcroft Inc Dba Heise (USA) |
| 0083757 | Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse (USA) |
| 76-S-104 PIECE 4 PRIMARY | Derbyshire Machine & Tool Co (USA) |
NSN 4820-00-036-1985 is a Seat,valve, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-036-1985 has 3 cross-referenced part numbers: 83757 (Ashcroft Inc Dba Heise), 0083757 (Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse), 76-S-104 PIECE 4 (Derbyshire Machine & Tool Co).
There are 4 known substitutes for 4820-00-036-1985: 5315-00-013-7164, 5306-00-453-2808, 2915-00-945-5836 and 1 more. Verify interchangeability with system specifications before substitution.
Key specifications for 76-S-104 PIECE 4: Flange Seat to Disk End Height: 0.688 INCHES NOMINAL IN; Under Flange Height: 1.875 INCHES NOMINAL IN; Thread Length: 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN; Thread Quantity Per Inch: 14 SINGLE THREADED PORTION. 13 total characteristics are documented in the Federal Logistics Information System.