PartsTable TECHNICAL DATA SHEET

JULY 2026Technical Data Sheet

MD8256Seat,valve

Name: MD8256
SKU: 4820-00-363-8397

Mwm-Murphy Diesel Co · NSN 4820-00-363-8397 · FSC 4820 · No Item Name Available

Verified by PartsTable

NSN 4820-00-363-8397 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-363-8397. Primary manufacturer part number: MD8256.

4820-00-363-8397 — No Item Name Available illustration

Features

Seat,valve — FSC 4820
Under Flange Height: 0.090 INCHES NOMINAL IN
Seating Surface Shape: FLAT
Material: STEEL OVERALL
Style Designator: PLAIN FLANGED
Flange Seat to Disk End Height: 0.108 INCHES NOMINAL IN
Body Outside Diameter: 0.293 INCHES NOMINAL IN
Flange Diameter: 0.622 INCHES NOMINAL IN

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 4820-00-363-8397, 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 8 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-00-363-8397
Primary Part Number	MD8256
Item Name	Seat,valve
FSC / FSG	4820 / 48 — No Item Name Available
Manufacturer	Mwm-Murphy Diesel Co
Status	ACTIVE
Under Flange Height	0.090 INCHES NOMINAL IN
Seating Surface Shape	FLAT
Material	STEEL OVERALL
Style Designator	PLAIN FLANGED
Flange Seat to Disk End Height	0.108 INCHES NOMINAL IN
Body Outside Diameter	0.293 INCHES NOMINAL IN
Flange Diameter	0.622 INCHES NOMINAL IN
Body Inside Diameter	0.088 INCHES NOMINAL IN

Lifecycle & Compliance

Acquisition Status	ACTIVE
HAZMAT	No

⇄ Verified Substitutes 10

2930-00-071-3172218150R95 INTERCHANGEABLE

Pump,cooling System,engine

Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/

3110-00-156-5250213R INTERCHANGEABLE

Bearing,ball,annular

Skf Usa Inc.

6810-00-241-1109 INTERCHANGEABLE

Strontium Nitrate,anhydrous

3030-00-528-675617470 INTERCHANGEABLE

Belt,v

Carlisle Power Transmission Products Inc

5305-01-142-119110560 PIECE 1 INTERCHANGEABLE

Screw

Imi Cash Valve Inc

5340-01-290-2173NAS1829B4E20 INTERCHANGEABLE

Standoff,threaded,spacing

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use

1265-01-303-4328 INTERCHANGEABLE

Receiver-Transmitter Subassembly

7025-01-459-45038256 INTERCHANGEABLE

Keyboard,data Entry

U S Dept of Transportation Federal Aviation Administration

3020-01-494-0937 INTERCHANGEABLE

Ratchet Wheel

5950-01-627-9707 INTERCHANGEABLE

Transformer,current

Cross-Reference Index

Part Number	Manufacturer
MD8256	Mwm-Murphy Diesel Co (USA)
8256	Mwm-Murphy Diesel Co (USA)

Related Parts

2930-00-071-3172INTERCHANGEABLE

PUMP,COOLING SYSTEM,ENGINE

218150R95

3110-00-156-5250INTERCHANGEABLE

BEARING,BALL,ANNULAR

213R

6810-00-241-1109INTERCHANGEABLE

STRONTIUM NITRATE,ANHYDROUS

3030-00-528-6756INTERCHANGEABLE

BELT,V

17470

5305-01-142-1191INTERCHANGEABLE

SCREW

10560 PIECE 1

5340-01-290-2173INTERCHANGEABLE

STANDOFF,THREADED,SPACING

NAS1829B4E20

1265-01-303-4328INTERCHANGEABLE

RECEIVER-TRANSMITTER SUBASSEMBLY

7025-01-459-4503INTERCHANGEABLE

KEYBOARD,DATA ENTRY

8256

3020-01-494-0937INTERCHANGEABLE

RATCHET WHEEL

5950-01-627-9707INTERCHANGEABLE

TRANSFORMER,CURRENT

Frequently Asked Questions

What is NSN 4820-00-363-8397?

NSN 4820-00-363-8397 is a Seat,valve, manufactured by Mwm-Murphy Diesel Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-363-8397?

NSN 4820-00-363-8397 has 2 cross-referenced part numbers: MD8256 (Mwm-Murphy Diesel Co), 8256 (Mwm-Murphy Diesel Co).

What NSN replaces 4820-00-363-8397?

There are 10 known substitutes for 4820-00-363-8397: 2930-00-071-3172, 3110-00-156-5250, 6810-00-241-1109 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MD8256?

Key specifications for MD8256: Under Flange Height: 0.090 INCHES NOMINAL IN; Seating Surface Shape: FLAT; Material: STEEL OVERALL; Style Designator: PLAIN FLANGED. 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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