The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-481-2587, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-481-2587 |
| Primary Part Number | 40398-407 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Style Designator | SOCKET W/BRAZING RING |
| Special Test Features | HI SHOCK TESTING AND VIBRATION TESTING, AERO NAV LABORATORIES, 9-4042, 12/29/99. |
| Temp Rating | 165.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | QQ-N-281, CLASS B FED SPEC SINGLE MATERIAL RESPONSE STEM |
| End Connection Quantity | 2 |
| Outlet Pressure Range | 50.0 TO 150.0 CAMERA MOUNT |
| Valve Loading Method | SPRING |
| First End Connection Type | UNTHREADED INTERNAL PIPE |
| First End Nominal Pipe Size Accommodated | 0.750 INCHES IN |
| Material | NICKEL ALLOY AND COPPER ALLOY SEAT |
| Material | NICKEL ALLOY R-405 STEM |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE |
| Media for Which Designed | WATER, SALT |
| Furnished Items | BRAZING RING |
| Filter | NOT INCLUDED |
| 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 |
|---|---|
| 40398-407 PRIMARY | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| 40398-4 ASSY 40398-407 | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 40398-4 | D/9 Drawing number reference only Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
NSN 4820-01-481-2587 is a Valve,regulating,fluid Pressure, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-481-2587 has 2 manufacturer part numbers on file: 40398-407 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40398-4 ASSY 40398-407 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
3 possible matches (shared part number, not a government interchangeability claim): 4810-01-682-5259, 4810-01-683-8703, 4820-01-687-7665. Verify interchangeability with system specifications before substitution.
Key specifications for 40398-407: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU. 20 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.