The Valve,safety Relief, cataloged under National Stock Number 4820-01-691-8972, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hy-Lok Usa, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-691-8972 |
| Primary Part Number | EF8F-12N |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hy-Lok Usa, Inc. |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Flange Shape | HEXAGON ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Connection Style | FLARE(TUBE) ALL ENDS |
| Nominal Length | 3.23 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM A479 T+316 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Valve Size | 0.75 INCHES IN |
| Material | STEEL COMP 316 BODY |
| Material | RUBBER SYNTHETIC O-RING |
| 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 |
|---|---|
| EF8F-12N PRIMARY | Hy-Lok Usa, Inc. (USA) |
NSN 4820-01-691-8972 is a Valve,safety Relief, manufactured by Hy-Lok Usa, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-691-8972 has 1 manufacturer part number on file: EF8F-12N (Hy-Lok Usa, Inc.).
Key specifications for EF8F-12N: Flow Control Device: POPPET; Flange Shape: HEXAGON ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Connection Style: FLARE(TUBE) ALL ENDS. 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.