PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1718Piston,poppet,valve

Droitcour Co · NSN 4820-00-421-0438 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-421-0438 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-421-0438. Primary manufacturer part number: 1718.
Features
  • Piston,poppet,valve — FSC 4820
  • FSC Application Data: HYDRAULIC RELIEF VALVE 48208789158
  • General Characteristics Item Description: ALUMINUM ALLOY,
  • 1 verified cross-reference
  • Primary manufacturer: Droitcour Co
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Piston,poppet,valve, cataloged under National Stock Number 4820-00-421-0438, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Droitcour Co. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, 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
NSN4820-00-421-0438
Primary Part Number1718
Item NamePiston,poppet,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerDroitcour Co
StatusACTIVE
FSC Application DataHYDRAULIC RELIEF VALVE 48208789158
General Characteristics Item DescriptionALUMINUM ALLOY,
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5930-00-065-7759123SCEC185-1 INTERCHANGEABLE
Switch,pressure
Northrop Grumman Systems Corporation
6675-00-222-2542 INTERCHANGEABLE
Measurer,map
5310-00-261-6189 INTERCHANGEABLE
Washer,lock
5905-00-463-93260816-0015 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Agilent Technologies, Inc. Div Agilent Technologies Headquarters
4330-00-469-112450127S4503-705797 INTERCHANGEABLE
Cover,fluid Filter
Naval Sea Systems Command
6320-00-480-7922171-8 INTERCHANGEABLE
Modification Kit,signal System
Lockheed Martin Corporation Div Rms
5930-00-756-8117242318R91 INTERCHANGEABLE
Switch,push-Pull
Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/
5360-00-845-7428 INTERCHANGEABLE
Spring,helical,extension
5905-00-879-66391718 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5331-00-921-6774 INTERCHANGEABLE
O-Ring
Cross-Reference Index
Part NumberManufacturer
1718 PRIMARY Droitcour Co (USA)
Related Parts
5930-00-065-7759INTERCHANGEABLE
SWITCH,PRESSURE
123SCEC185-1
6675-00-222-2542INTERCHANGEABLE
MEASURER,MAP
5310-00-261-6189INTERCHANGEABLE
WASHER,LOCK
5905-00-463-9326INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
0816-0015
4330-00-469-1124INTERCHANGEABLE
COVER,FLUID FILTER
50127S4503-705797
6320-00-480-7922INTERCHANGEABLE
MODIFICATION KIT,SIGNAL SYSTEM
171-8
5930-00-756-8117INTERCHANGEABLE
SWITCH,PUSH-PULL
242318R91
5360-00-845-7428INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
5905-00-879-6639INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
1718
5331-00-921-6774INTERCHANGEABLE
O-RING
5930-01-005-8845INTERCHANGEABLE
SWITCH,ROTARY
1718
4720-01-035-6601INTERCHANGEABLE
HOSE,NONMETALLIC
AE246-8

Frequently Asked Questions

What is NSN 4820-00-421-0438?

NSN 4820-00-421-0438 is a Piston,poppet,valve, manufactured by Droitcour Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-421-0438?

NSN 4820-00-421-0438 has 1 cross-referenced part number: 1718 (Droitcour Co).

What NSN replaces 4820-00-421-0438?

There are 12 known substitutes for 4820-00-421-0438: 5930-00-065-7759, 6675-00-222-2542, 5310-00-261-6189 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1718?

Key specifications for 1718: FSC Application Data: HYDRAULIC RELIEF VALVE 48208789158; General Characteristics Item Description: ALUMINUM ALLOY,. 2 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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