PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

355-311-.25IN-ITEM2Seat,valve

Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc · NSN 4820-01-554-8702 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-554-8702 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-554-8702. Primary manufacturer part number: 355-311-.25IN-ITEM2.
Features
  • Seat,valve — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-554-8702, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. 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: Active.

Catalog Facts
Item NameSeat,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersMilwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (CAGE 76364)
Technical Specifications
ParameterValue
NSN4820-01-554-8702
Primary Part Number355-311-.25IN-ITEM2
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMilwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5910-01-171-8693 INTERCHANGEABLE
Capacitor,fixed,ceramic Dielectr
1015-01-207-569035531-1 INTERCHANGEABLE
Post,retaining
Cadillac Gage Textron Inc.
4820-01-554-8765355-311 12 INTERCHANGEABLE
Valve,ball
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-8786355-311-.50IN-ITEM2 INTERCHANGEABLE
Seat,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-8792689-DS-613 INTERCHANGEABLE
Ball,valve,ported
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-8802355-311 100 INTERCHANGEABLE
Valve,ball
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-8809355-311-1.00IN-ITEM2 INTERCHANGEABLE
Seat,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-8814355-311-1.00IN-ITEM13 INTERCHANGEABLE
Ball,valve,ported
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-9628355-311-200 INTERCHANGEABLE
Valve,ball
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-554-964074109-J A753 INTERCHANGEABLE
Seat,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
Cross-Reference Index
Part NumberManufacturer
355-311-.25IN-ITEM2 PRIMARY Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
355-311 Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
Related Parts
5910-01-171-8693INTERCHANGEABLE
CAPACITOR,FIXED,CERAMIC DIELECTR
1015-01-207-5690INTERCHANGEABLE
POST,RETAINING
35531-1
4820-01-554-8765INTERCHANGEABLE
VALVE,BALL
355-311 12
4820-01-554-8786INTERCHANGEABLE
SEAT,VALVE
355-311-.50IN-ITEM2
4820-01-554-8792INTERCHANGEABLE
BALL,VALVE,PORTED
689-DS-613
4820-01-554-8802INTERCHANGEABLE
VALVE,BALL
355-311 100
4820-01-554-8809INTERCHANGEABLE
SEAT,VALVE
355-311-1.00IN-ITEM2
4820-01-554-8814INTERCHANGEABLE
BALL,VALVE,PORTED
355-311-1.00IN-ITEM13
4820-01-554-9628INTERCHANGEABLE
VALVE,BALL
355-311-200
4820-01-554-9640INTERCHANGEABLE
SEAT,VALVE
74109-J A753
4820-01-554-9655INTERCHANGEABLE
BALL,VALVE,PORTED
6819-J-613
4820-01-559-6276INTERCHANGEABLE
VALVE,BALL
355-311 34

Frequently Asked Questions

What is NSN 4820-01-554-8702?

NSN 4820-01-554-8702 is a Seat,valve, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-554-8702?

NSN 4820-01-554-8702 has 2 cross-referenced part numbers: 355-311-.25IN-ITEM2 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 355-311 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).

What NSN replaces 4820-01-554-8702?

There are 12 known substitutes for 4820-01-554-8702: 5910-01-171-8693, 1015-01-207-5690, 4820-01-554-8765 and 9 more. Verify interchangeability with system specifications before substitution.

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