PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

40399-903Valve,regulating,fluid Pressure

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-244-5366 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-244-5366 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-244-5366. Primary manufacturer part number: 40399-903.
Features
  • Valve,regulating,fluid Pressure — FSC 4820
  • Filter: NOT INCLUDED
  • First End Style Designator: SOCKET W/BRAZING RING
  • End Connection Quantity: 2
  • First End Nominal Pipe Size Accommodated: 1.000 INCHES IN
  • Body Style: STRAIGHT THRU
  • Material: NICKEL ALLOY STEM
  • Material Document and Classification: MIL-D-17650 MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Nickel Alloy Stem construction
General Description

The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-244-5366, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-244-5366
Primary Part Number40399-903
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusACTIVE
FilterNOT INCLUDED
First End Style DesignatorSOCKET W/BRAZING RING
End Connection Quantity2
First End Nominal Pipe Size Accommodated1.000 INCHES IN
Body StyleSTRAIGHT THRU
MaterialNICKEL ALLOY STEM
Material Document and ClassificationMIL-D-17650 MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
Material Document and ClassificationQQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE SEAT
MaterialRUBBER SYNTHETIC FLOW CONTROL DEVICE
Material Document and ClassificationQQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE STEM
Material Document and ClassificationASTM B61 ASSN STD SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED
Media for Which DesignedWATER, SALT
MaterialNICKEL ALLOY AND COPPER ALLOY SEAT
Regulation TypeAUTOMATIC SINGLE STAGE
Flow Control DeviceDISK
Maximum Inlet Pressure RatingERR-060
First End Connection TypeUNTHREADED INTERNAL PIPE
Second End Relationship with First EndIDENTICAL
Valve Loading MethodSPRING
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
1630-00-672-441040-399 INTERCHANGEABLE
Control Box Assembly,anti-Skid D
Hydro-Aire Aerospace Corp
4820-01-256-361340399-901 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-464-445140399-911 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-466-248540399-910 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-467-549740399-410 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
5340-01-471-703440399 INTERCHANGEABLE
Snap Hook
Lynn Electronics Llc
Cross-Reference Index
Part NumberManufacturer
40399-903 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40399 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
1630-00-672-4410INTERCHANGEABLE
CONTROL BOX ASSEMBLY,ANTI-SKID D
40-399
4820-01-256-3613INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40399-901
4820-01-464-4451INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40399-911
4820-01-466-2485INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40399-910
4820-01-467-5497INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40399-410
5340-01-471-7034INTERCHANGEABLE
SNAP HOOK
40399

Frequently Asked Questions

What is NSN 4820-01-244-5366?

NSN 4820-01-244-5366 is a Valve,regulating,fluid Pressure, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-244-5366?

NSN 4820-01-244-5366 has 2 cross-referenced part numbers: 40399-903 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40399 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).

What NSN replaces 4820-01-244-5366?

There are 6 known substitutes for 4820-01-244-5366: 1630-00-672-4410, 4820-01-256-3613, 4820-01-464-4451 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 40399-903?

Key specifications for 40399-903: Filter: NOT INCLUDED; First End Style Designator: SOCKET W/BRAZING RING; End Connection Quantity: 2; First End Nominal Pipe Size Accommodated: 1.000 INCHES IN. 19 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com