PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

01-368Seat,valve

Ontic Engineering & Manufacturing, Inc Dba Ontic Us · NSN 4820-00-441-9824 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-441-9824 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-441-9824. Primary manufacturer part number: 01-368.
Features
  • Seat,valve — FSC 4820
  • Body Inside Diameter: 0.155 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN
  • Material: STEEL OVERALL
  • Flange Diameter: 0.378 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
  • Flange Seat to Disk End Height: 0.057 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN
  • Under Flange Height: 0.120 INCHES MINIMUM AND 0.131 INCHES MAXIMUM IN
  • Body Outside Diameter: 0.276 INCHES MINIMUM AND 0.278 INCHES MAXIMUM IN
  • FSC Application Data: PUMP,ACFT HYDRAULIC GEAR
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-00-441-9824, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-00-441-9824
Primary Part Number01-368
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerOntic Engineering & Manufacturing, Inc Dba Ontic Us
StatusACTIVE
Body Inside Diameter0.155 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN
MaterialSTEEL OVERALL
Flange Diameter0.378 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
Flange Seat to Disk End Height0.057 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN
Under Flange Height0.120 INCHES MINIMUM AND 0.131 INCHES MAXIMUM IN
Body Outside Diameter0.276 INCHES MINIMUM AND 0.278 INCHES MAXIMUM IN
FSC Application DataPUMP,ACFT HYDRAULIC GEAR
Style DesignatorPLAIN FLANGED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5330-00-039-483001368 INTERCHANGEABLE
Gasket
Defense Logistics Agency Dba Defense Supply Center Philadelphia
5950-00-471-2333905193-1 INTERCHANGEABLE
Reactor
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
5815-00-604-25041368 INTERCHANGEABLE
Check Pawl Link
Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service
Cross-Reference Index
Part NumberManufacturer
01-368 Hamilton Sundstrand Corporation (USA)
01-368 PRIMARY Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA)
01-368 Donallco Inc (USA)
Related Parts
5330-00-039-4830INTERCHANGEABLE
GASKET
01368
5950-00-471-2333INTERCHANGEABLE
REACTOR
905193-1
5815-00-604-2504INTERCHANGEABLE
CHECK PAWL LINK
1368

Frequently Asked Questions

What is NSN 4820-00-441-9824?

NSN 4820-00-441-9824 is a Seat,valve, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-441-9824?

NSN 4820-00-441-9824 has 3 cross-referenced part numbers: 01-368 (Hamilton Sundstrand Corporation), 01-368 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 01-368 (Donallco Inc).

What NSN replaces 4820-00-441-9824?

There are 3 known substitutes for 4820-00-441-9824: 5330-00-039-4830, 5950-00-471-2333, 5815-00-604-2504. Verify interchangeability with system specifications before substitution.

What are the specifications of 01-368?

Key specifications for 01-368: Body Inside Diameter: 0.155 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN; Material: STEEL OVERALL; Flange Diameter: 0.378 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN; Flange Seat to Disk End Height: 0.057 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN. 8 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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