PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

39-740-1Piston,valve

Automatic Switch Company Dba Asco · NSN 4820-01-181-1828 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-181-1828 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-181-1828. Primary manufacturer part number: 39-740-1.
Features
  • Piston,valve — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: Automatic Switch Company Dba Asco
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Piston,valve, cataloged under National Stock Number 4820-01-181-1828, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Automatic Switch Company Dba Asco. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NamePiston,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersAutomatic Switch Company Dba Asco (CAGE 04845)
Technical Specifications
ParameterValue
NSN4820-01-181-1828
Primary Part Number39-740-1
Item NamePiston,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerAutomatic Switch Company Dba Asco
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
2520-00-463-4432A3838Y77 INTERCHANGEABLE
Cap Assy,drive Shaft
Meritor Industrial Products, Llc
3040-01-543-2873397-40-1 INTERCHANGEABLE
Pivot Shaft Assembly
Meritor Specialty Products Llc
Cross-Reference Index
Part NumberManufacturer
102-260-2 Automatic Switch Company Dba Asco (USA)
39-740-1 PRIMARY Automatic Switch Company Dba Asco (USA)
Related Parts
2520-00-463-4432INTERCHANGEABLE
CAP ASSY,DRIVE SHAFT
A3838Y77
3040-01-543-2873INTERCHANGEABLE
PIVOT SHAFT ASSEMBLY
397-40-1

Frequently Asked Questions

What is NSN 4820-01-181-1828?

NSN 4820-01-181-1828 is a Piston,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-181-1828?

NSN 4820-01-181-1828 has 2 cross-referenced part numbers: 102-260-2 (Automatic Switch Company Dba Asco), 39-740-1 (Automatic Switch Company Dba Asco).

What NSN replaces 4820-01-181-1828?

There are 2 known substitutes for 4820-01-181-1828: 2520-00-463-4432, 3040-01-543-2873. Verify interchangeability with system specifications before substitution.

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