The Valve,safety Relief, cataloged under National Stock Number 4820-00-289-0839, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-289-0839 |
| Primary Part Number | R10AP2P203-BM1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Face Design | PLAIN FIRST END |
| Bolt Circle Nominal Diameter | 8.875 INCHES FIRST END IN |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.688 INCHES FIRST END IN |
| Adjustable Pressure Range | +10.0 TO 12.0 POUNDS PER SQUARE INCH LBS |
| Nominal Outside Diameter | 10.125 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 12 FIRST END |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY SEAT |
| Material | COPPER ALLOY STEM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| R10AP2P203-BM1 PRIMARY | Hunt Valve Company, Inc. (USA) |
| D52008 | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| D52008 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10AP2P203-BM1 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| 1817 6IN 10T12PSI FLGE | 3/1 Design control — primary reference Gma Cover Corp |
NSN 4820-00-289-0839 is a Valve,safety Relief, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-289-0839 has 2 manufacturer part numbers on file: R10AP2P203-BM1 (Hunt Valve Company, Inc.), D52008 (Hunt Valve Company, Inc.).
4 possible matches (shared part number, not a government interchangeability claim): 5930-01-210-5020, 4820-01-311-4846, 4820-01-311-4951. Verify interchangeability with system specifications before substitution.
Key specifications for R10AP2P203-BM1: Flange Shape: ROUND WITH HOLES FIRST END; Flange Face Design: PLAIN FIRST END; Bolt Circle Nominal Diameter: 8.875 INCHES FIRST END IN; Connection Type: FLANGE FIRST END. 13 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.