PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

64-657 3-8INUnion,pipe

Phelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill · NSN 4730-00-840-9395 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-00-840-9395 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-840-9395. Primary manufacturer part number: 64-657 3-8IN.
Features
  • Union,pipe — FSC 4730
  • Media for Which Designed: WATER-OIL-GAS FIRST RESPONSE
  • Operating Pressure: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
  • Material: COPPER ALLOY SEAT
  • Thread Series Designator: NPT FIRST END
  • Nominal Thread Size: 0.375 INCHES FIRST END IN
  • Connection Type: THREADED INTERNAL PIPE FIRST END
  • Material: COPPER ALLOY OVERALL
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Copper Alloy Seat construction
General Description

The Union,pipe, cataloged under National Stock Number 4730-00-840-9395, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Phelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-00-840-9395
Primary Part Number64-657 3-8IN
Item NameUnion,pipe
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerPhelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill
StatusACTIVE
Media for Which DesignedWATER-OIL-GAS FIRST RESPONSE
Operating Pressure250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
MaterialCOPPER ALLOY SEAT
Thread Series DesignatorNPT FIRST END
Nominal Thread Size0.375 INCHES FIRST END IN
Connection TypeTHREADED INTERNAL PIPE FIRST END
MaterialCOPPER ALLOY OVERALL
Nominal Pipe Size Accommodated0.375 INCHES FIRST END IN
Connection StyleSOCKET W/ FLARE (TUBE) FIRST END
Seat TypeGROUND-JOINT
Nominal Overall Length1.750 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
9540-00-145-8378 INTERCHANGEABLE
Angle,structural
5910-00-406-6135 INTERCHANGEABLE
Capacitor,fixed,paper Dielectric
6660-00-443-4296485 INTERCHANGEABLE
Timer,winds Aloft,t
Warren Industries Inc Dba Warren Industries Inc Div Warren-Knight Instrument Co. and N. Amer. Survey Supply Co.
6625-00-548-8181485 INTERCHANGEABLE
Oscilloscope
Tektronix, Inc.
5330-00-599-512049407 INTERCHANGEABLE
Seal,plain Encased
Dana Automotive Systems Group, Llc Dba Dana Sealing Products
6105-00-706-0952 INTERCHANGEABLE
Motor,direct Current
5950-00-715-635848-5 INTERCHANGEABLE
Coil,radio Frequency
Keysight Technologies Inc
4730-00-840-9399 INTERCHANGEABLE
Union,pipe
5915-00-886-9175 INTERCHANGEABLE
Network,summing No
5815-01-114-6702485 INTERCHANGEABLE
Teleprocessing System
Xerox Corporation
Cross-Reference Index
Part NumberManufacturer
64-657 3-8IN Phelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill (USA)
485 Itt Grinnell Corp (USA)
Related Parts
9540-00-145-8378INTERCHANGEABLE
ANGLE,STRUCTURAL
5910-00-406-6135INTERCHANGEABLE
CAPACITOR,FIXED,PAPER DIELECTRIC
6660-00-443-4296INTERCHANGEABLE
TIMER,WINDS ALOFT,T
485
6625-00-548-8181INTERCHANGEABLE
OSCILLOSCOPE
485
5330-00-599-5120INTERCHANGEABLE
SEAL,PLAIN ENCASED
49407
6105-00-706-0952INTERCHANGEABLE
MOTOR,DIRECT CURRENT
5950-00-715-6358INTERCHANGEABLE
COIL,RADIO FREQUENCY
48-5
4730-00-840-9399INTERCHANGEABLE
UNION,PIPE
5915-00-886-9175INTERCHANGEABLE
NETWORK,SUMMING NO
5815-01-114-6702INTERCHANGEABLE
TELEPROCESSING SYSTEM
485
5930-01-150-8096INTERCHANGEABLE
SWITCH-JOYSTICK ASSEMBLY
485
6625-01-347-2862INTERCHANGEABLE
AMMETER

Frequently Asked Questions

What is NSN 4730-00-840-9395?

NSN 4730-00-840-9395 is a Union,pipe, manufactured by Phelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-00-840-9395?

NSN 4730-00-840-9395 has 2 cross-referenced part numbers: 64-657 3-8IN (Phelps Dodge Industries Inc Phelps Dodge Brass Co Div Lee Vrought and Cast Fittings Mill), 485 (Itt Grinnell Corp).

What NSN replaces 4730-00-840-9395?

There are 12 known substitutes for 4730-00-840-9395: 9540-00-145-8378, 5910-00-406-6135, 6660-00-443-4296 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 64-657 3-8IN?

Key specifications for 64-657 3-8IN: Media for Which Designed: WATER-OIL-GAS FIRST RESPONSE; Operating Pressure: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS; Material: COPPER ALLOY SEAT; Thread Series Designator: NPT FIRST END. 11 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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