The Valve,safety Relief, cataloged under National Stock Number 4820-00-138-2285, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 15 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-138-2285 |
| Primary Part Number | 11663148 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Surface Treatment Document and Classification | MIL-A-8625,TY 1 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-A-200/3,ALLOY2024,T4 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-225/6,ALLOY2024,T4 FED SPEC 2ND MATERIAL RESPONSE BODY |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.563 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| Valve Operation Method | HYDRAULIC |
| 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 |
|---|---|
| 11663148 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 4820-00-138-2285 is a Valve,safety Relief, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-138-2285 has 1 manufacturer part number on file: 11663148 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 11663148: Flow Control Device: POPPET; Surface Treatment Document and Classification: MIL-A-8625,TY 1 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Connection Style: FLARED (TUBE) ALL ENDS; Style Designator: STRAIGHT THRU. 15 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.