PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1020941JValve Assembly

Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic · NSN 4820-01-644-0841 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-644-0841 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-644-0841. Primary manufacturer part number: 1020941J.
Features
  • Valve Assembly — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve Assembly, cataloged under National Stock Number 4820-01-644-0841, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-644-0841
Primary Part Number1020941J
Item NameValve Assembly
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTwin Disc, Incorporated Dba Twin Disc Mid-Atlantic
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
3120-00-097-939645413 INTERCHANGEABLE
Bushing,sleeve
Aerocontrolex Group, Inc. Div Talley Actuators
6660-01-012-57444541-3 INTERCHANGEABLE
Diaphragm
Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives
6220-01-201-412345413 INTERCHANGEABLE
Light,marker,clearance
Grote Industries Inc Dba Grote Manufacturing Co Div Military Products
5930-01-301-838651-121 INTERCHANGEABLE
Switch,push
L-3 Communications Westwood Corporation Dba Edi Division Div Tano Division
Cross-Reference Index
Part NumberManufacturer
45413 Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)
1020941J PRIMARY Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)
Related Parts
3120-00-097-9396INTERCHANGEABLE
BUSHING,SLEEVE
45413
6660-01-012-5744INTERCHANGEABLE
DIAPHRAGM
4541-3
6220-01-201-4123INTERCHANGEABLE
LIGHT,MARKER,CLEARANCE
45413
5930-01-301-8386INTERCHANGEABLE
SWITCH,PUSH
51-121

Frequently Asked Questions

What is NSN 4820-01-644-0841?

NSN 4820-01-644-0841 is a Valve Assembly, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-644-0841?

NSN 4820-01-644-0841 has 2 cross-referenced part numbers: 45413 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), 1020941J (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).

What NSN replaces 4820-01-644-0841?

There are 4 known substitutes for 4820-01-644-0841: 3120-00-097-9396, 6660-01-012-5744, 6220-01-201-4123 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1020941J?

Key specifications for 1020941J: Part Name Assigned by Controlling Agency: VALVE ASSEMBLY. GP. 1 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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