The Valve,safety Relief, cataloged under National Stock Number 4820-01-418-4081, 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 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-418-4081 |
| Primary Part Number | R10AH1H112-BM3 AND D49501 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Material Document and Classification | ASTM B61 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE AND ASTM BG-710 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +59.0 TO 72.0 POUNDS PER SQUARE INCH LBS |
| Disk Loading Method | SPRING |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY SEAT |
| Material | COPPER ALLOY 922 BODY |
| Material | NICKEL ALLOY AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| R10AH1H112-BM3 AND D49501 PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| R10AH1H112-BM3 AND D49501 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| D49501 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-418-4081 is a Valve,safety Relief, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-418-4081 has 1 manufacturer part number on file: R10AH1H112-BM3 AND D49501 (Hunt Valve Company, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-651-0931. Verify interchangeability with system specifications before substitution.
Key specifications for R10AH1H112-BM3 AND D49501: Material Document and Classification: ASTM B61 ASSN STD SINGLE MATERIAL RESPONSE BODY; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE SEAT; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE AND ASTM BG-710 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE. 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.