PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

121527Seat,valve

Aerco International, Inc. Dba Aerco International Inc · NSN 4820-01-439-8794 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-439-8794 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-439-8794. Primary manufacturer part number: 121527.
Features
  • Seat,valve — FSC 4820
  • 1 verified cross-reference
  • Primary manufacturer: Aerco International, Inc. Dba Aerco International Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-439-8794, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Aerco International, Inc. Dba Aerco International Inc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-439-8794
Primary Part Number121527
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerAerco International, Inc. Dba Aerco International Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
3110-00-100-0498121527 INTERCHANGEABLE
Cup,tapered Roller Bearing
General Motors Llc Dba General Motors Llc
Cross-Reference Index
Part NumberManufacturer
121527 PRIMARY Aerco International, Inc. Dba Aerco International Inc (USA)
Related Parts
3110-00-100-0498INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
121527

Frequently Asked Questions

What is NSN 4820-01-439-8794?

NSN 4820-01-439-8794 is a Seat,valve, manufactured by Aerco International, Inc. Dba Aerco International Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-439-8794?

NSN 4820-01-439-8794 has 1 cross-referenced part number: 121527 (Aerco International, Inc. Dba Aerco International Inc).

What NSN replaces 4820-01-439-8794?

There is 1 known substitute for 4820-01-439-8794: 3110-00-100-0498. Verify interchangeability with system specifications before substitution.

What are the specifications of 121527?

Key specifications for 121527: End Item Identification: TYPE CXT-S TEMPERATURE REGULATOR; MARS CLASS AFS. 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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