The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-422-7136, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hale Products, Inc.. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-422-7136 |
| Primary Part Number | 538-1261-01-0 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hale Products, Inc. |
| Status | ACTIVE |
| First End Thread Series Designator | NPT |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 170.0 FAHRENHEIT DEGF |
| Second End Nominal Thread Size | 1.250 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | PLAIN |
| Second End Thread Series Designator | NPT |
| Second End Nominal Pipe Size Accommodated | 1.250 INCHES IN |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Second End Style Designator | PLAIN |
| First End Connection Type | THREADED INTERNAL PIPE |
| Temp Adjustability | NOT ADJUSTABLE |
| First End Nominal Pipe Size Accommodated | 0.125 INCHES IN |
| Media for Which Designed | WATER, FRESH |
| Second End Connection Type | THREADED EXTERNAL PIPE |
| First End Nominal Thread Size | 0.125 INCHES IN |
| 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 |
|---|---|
| 538-1261-01-0 PRIMARY | Hale Products, Inc. (USA) |
| Reference | Meaning |
|---|---|
| TRV170 | 5/9 Secondary reference Hale Products, Inc. |
| 538-1260-01-0 | 5/9 Secondary reference Hale Products, Inc. |
NSN 4820-01-422-7136 is a Valve,relief,pressure and Temper, manufactured by Hale Products, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-422-7136 has 1 manufacturer part number on file: 538-1261-01-0 (Hale Products, Inc.).
Key specifications for 538-1261-01-0: First End Thread Series Designator: NPT; First End Thread Direction: RIGHT-HAND; Temp Rating: 170.0 FAHRENHEIT DEGF; Second End Nominal Thread Size: 1.250 INCHES IN. 18 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.