The Seat,valve, cataloged under National Stock Number 4820-01-129-5636, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-129-5636 |
| Primary Part Number | 91575-103 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.125 INCHES NOMINAL IN |
| Flange Diameter | 0.375 INCHES NOMINAL IN |
| Thread Length | 0.156 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.173 INCHES NOMINAL IN |
| Nominal Thread Size | 0.312 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.183 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Material | STEEL COMP 316 OVERALL |
| Seat Angle in Deg | 60.000 NOMINAL |
| Thread Series Designator | UNEF SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 8113F8 ITEM 18 | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA) |
| 91575-103 PRIMARY | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA) |
| Reference | Meaning |
|---|---|
| 8113F8 | D/9 Drawing number reference only Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok |
NSN 4820-01-129-5636 is a Seat,valve, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-129-5636 has 2 manufacturer part numbers on file: 8113F8 ITEM 18 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok), 91575-103 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
Key specifications for 91575-103: Flange Seat to Disk End Height: 0.125 INCHES NOMINAL IN; Flange Diameter: 0.375 INCHES NOMINAL IN; Thread Length: 0.156 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.