PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MD8255Seat,valve

Mwm-Murphy Diesel Co · NSN 4820-00-363-8398 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-363-8398 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-363-8398. Primary manufacturer part number: MD8255.
Features
  • Seat,valve — FSC 4820
  • Body Outside Diameter: 0.435 INCHES NOMINAL IN
  • Seating Surface Shape: ANGULAR
  • Style Designator: PLAIN
  • Material: STEEL OVERALL
  • Body Inside Diameter: 0.062 INCHES NOMINAL IN
  • Seat Angle in Deg: 0.750 NOMINAL
  • 2 verified cross-references
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 4820-00-363-8398, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Mwm-Murphy Diesel Co. Government technical data includes 6 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN4820-00-363-8398
Primary Part NumberMD8255
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMwm-Murphy Diesel Co
StatusCANCELLED
Body Outside Diameter0.435 INCHES NOMINAL IN
Seating Surface ShapeANGULAR
Style DesignatorPLAIN
MaterialSTEEL OVERALL
Body Inside Diameter0.062 INCHES NOMINAL IN
Seat Angle in Deg0.750 NOMINAL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
3110-00-144-8662 INTERCHANGEABLE
Bearing,ball,annular
5920-00-221-4556BAN1-2A INTERCHANGEABLE
Fuse,cartridge
Cooper Bussmann, Llc Dba Cooper Industries
4730-00-817-18725SBTX-B INTERCHANGEABLE
Tee,pipe to Tube
Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division
5360-00-909-709082-111 INTERCHANGEABLE
Spring,modulating
Aqua-Chem, Inc. Dba Aqua-Chem Inc
5950-01-022-0477120-0938-00 INTERCHANGEABLE
Transformer,radio Frequency
Tektronix, Inc.
6530-01-023-0837 INTERCHANGEABLE
Envelope,sterilization
4720-01-055-83534115091 INTERCHANGEABLE
Hose Assembly,nonmetallic
Chrysler Corp Service and Parts Opns
5962-01-072-414311830671 INTERCHANGEABLE
Microcircuit,digital
Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate
6145-01-097-5948RG-62B/U INTERCHANGEABLE
Cable,radio Frequency
Times Microwave Systems, Inc Dba Times Microwave Systems Inc Div Times Microwave Systems
5360-01-171-157482-55 INTERCHANGEABLE
Spring
Aircraft Wheel and Brake, Llc Dba Cleveland Wheel and Brake Systems
Cross-Reference Index
Part NumberManufacturer
MD8255 Mwm-Murphy Diesel Co (USA)
8255 Mwm-Murphy Diesel Co (USA)
Related Parts
3110-00-144-8662INTERCHANGEABLE
BEARING,BALL,ANNULAR
5920-00-221-4556INTERCHANGEABLE
FUSE,CARTRIDGE
BAN1-2A
4730-00-817-1872INTERCHANGEABLE
TEE,PIPE TO TUBE
5SBTX-B
5360-00-909-7090INTERCHANGEABLE
SPRING,MODULATING
82-111
5950-01-022-0477INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
120-0938-00
6530-01-023-0837INTERCHANGEABLE
ENVELOPE,STERILIZATION
4720-01-055-8353INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
4115091
5962-01-072-4143INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
11830671
6145-01-097-5948INTERCHANGEABLE
CABLE,RADIO FREQUENCY
RG-62B/U
5360-01-171-1574INTERCHANGEABLE
SPRING
82-55
2030-01-176-7757INTERCHANGEABLE
HOUSING TRANSM
8255
6640-01-362-2405INTERCHANGEABLE
PAPER,RECORDING,CLINICAL ANALYZE
8257

Frequently Asked Questions

What is NSN 4820-00-363-8398?

NSN 4820-00-363-8398 is a Seat,valve, manufactured by Mwm-Murphy Diesel Co, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-00-363-8398?

NSN 4820-00-363-8398 has 2 cross-referenced part numbers: MD8255 (Mwm-Murphy Diesel Co), 8255 (Mwm-Murphy Diesel Co).

What NSN replaces 4820-00-363-8398?

There are 12 known substitutes for 4820-00-363-8398: 3110-00-144-8662, 5920-00-221-4556, 4730-00-817-1872 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MD8255?

Key specifications for MD8255: Body Outside Diameter: 0.435 INCHES NOMINAL IN; Seating Surface Shape: ANGULAR; Style Designator: PLAIN; Material: STEEL OVERALL. 7 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4820-00-363-8398 still in active supply?

NSN 4820-00-363-8398 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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