PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B2258Valve,governor

Niantic Tool, Inc. Dba Niantic Tool Co · NSN 4820-01-202-9245 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-202-9245 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-202-9245. Primary manufacturer part number: B2258.
Features
  • Valve,governor — FSC 4820
  • 10 verified cross-references
  • Primary manufacturer: Niantic Tool, Inc. Dba Niantic Tool Co
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,governor, cataloged under National Stock Number 4820-01-202-9245, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Niantic Tool, Inc. Dba Niantic Tool Co. This item has 10 commercial cross-references from 5 manufacturers, 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 NameValve,governor
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersNiantic Tool, Inc. Dba Niantic Tool Co (CAGE 0B5H6); Naval Sea Systems Command (CAGE 53711); Dresser Rand Co Terry Corp Steam Turbine Motor and Generator Co a Joint Venture (CAGE 82328); Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand (CAGE 0BR59); Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (CAGE 830Q4)
Technical Specifications
ParameterValue
NSN4820-01-202-9245
Primary Part NumberB2258
Item NameValve,governor
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerNiantic Tool, Inc. Dba Niantic Tool Co
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-084-9336BACN10MK3-65 INTERCHANGEABLE
Nut,self-Locking,plate
The Boeing Company Div Defense
5935-00-351-5944 INTERCHANGEABLE
Plug,end Seal,electrical Connect
5307-00-383-6737855918 INTERCHANGEABLE
Stud,special
Naval Sea Systems Command
6695-00-441-3601900022 INTERCHANGEABLE
Tester,water
Avox Systems Inc Dba Avox Systems Inc
6625-00-669-18083230-001 INTERCHANGEABLE
Shunt,tuning
Bird Electronic Corporation Div Bird Electronic Corp
4820-01-277-7587 INTERCHANGEABLE
Parts Kit,valve
4820-01-277-9098429130 INTERCHANGEABLE
Parts Kit,valve
Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions
4820-01-277-9099924058 INTERCHANGEABLE
Parts Kit,valve
Niantic Tool, Inc. Dba Niantic Tool Co
4820-01-282-7604429077 INTERCHANGEABLE
Parts Kit,valve
Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions
4820-01-282-8543429117 INTERCHANGEABLE
Parts Kit,valve
Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions
Cross-Reference Index
Part NumberManufacturer
B2258 PRIMARY Niantic Tool, Inc. Dba Niantic Tool Co (USA)
6525428 Naval Sea Systems Command (USA)
F-8473 ITEM 1 Dresser Rand Co Terry Corp Steam Turbine Motor and Generator Co a Joint Venture (USA)
900022 PRIMARY Niantic Tool, Inc. Dba Niantic Tool Co (USA)
916687 PRIMARY Naval Sea Systems Command (USA)
916687 Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand (USA)
F-8473 ITEM 1 Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA)
916687 Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA)
916687 Dresser Rand Co Terry Corp Steam Turbine Motor and Generator Co a Joint Venture (USA)
F-8473 ITEM 1 Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand (USA)
Related Parts
5310-00-084-9336INTERCHANGEABLE
NUT,SELF-LOCKING,PLATE
BACN10MK3-65
5935-00-351-5944INTERCHANGEABLE
PLUG,END SEAL,ELECTRICAL CONNECT
5307-00-383-6737INTERCHANGEABLE
STUD,SPECIAL
855918
6695-00-441-3601INTERCHANGEABLE
TESTER,WATER
900022
6625-00-669-1808INTERCHANGEABLE
SHUNT,TUNING
3230-001
4820-01-277-7587INTERCHANGEABLE
PARTS KIT,VALVE
4820-01-277-9098INTERCHANGEABLE
PARTS KIT,VALVE
429130
4820-01-277-9099INTERCHANGEABLE
PARTS KIT,VALVE
924058
4820-01-282-7604INTERCHANGEABLE
PARTS KIT,VALVE
429077
4820-01-282-8543INTERCHANGEABLE
PARTS KIT,VALVE
429117
4820-01-283-4879INTERCHANGEABLE
PARTS KIT,VALVE
429108
4820-01-283-4880INTERCHANGEABLE
PARTS KIT,VALVE
429179

Frequently Asked Questions

What is NSN 4820-01-202-9245?

NSN 4820-01-202-9245 is a Valve,governor, manufactured by Niantic Tool, Inc. Dba Niantic Tool Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-202-9245?

NSN 4820-01-202-9245 has 10 cross-referenced part numbers: B2258 (Niantic Tool, Inc. Dba Niantic Tool Co), 6525428 (Naval Sea Systems Command), F-8473 ITEM 1 (Dresser Rand Co Terry Corp Steam Turbine Motor and Generator Co a Joint Venture), 900022 (Niantic Tool, Inc. Dba Niantic Tool Co), 916687 (Naval Sea Systems Command) and 5 more.

What NSN replaces 4820-01-202-9245?

There are 12 known substitutes for 4820-01-202-9245: 5310-00-084-9336, 5935-00-351-5944, 5307-00-383-6737 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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