PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23521Valve,safety Relief

Circor Aerospace, Inc. Dba Circor Aerospace Inc · NSN 4820-01-553-0468 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-553-0468 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-553-0468. Primary manufacturer part number: 23521.
Features
  • Valve,safety Relief — FSC 4820
  • 3 verified cross-references
  • Primary manufacturer: Circor Aerospace, Inc. Dba Circor Aerospace Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-553-0468, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Circor Aerospace, Inc. Dba Circor Aerospace Inc. This item has 3 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.

Technical Specifications
ParameterValue
NSN4820-01-553-0468
Primary Part Number23521
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerCircor Aerospace, Inc. Dba Circor Aerospace Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-035-789323-521 INTERCHANGEABLE
Contact,electrical
Eaton Corp Opns & Technical Center
2810-00-118-902523521 INTERCHANGEABLE
Piston,internal Combustion Engin
Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
5950-00-648-540323521 INTERCHANGEABLE
Transformer,power
L3harris Technologies, Inc Div Space & Airborne Systems
5985-00-723-4628MX-1554A/U INTERCHANGEABLE
Seal,radio Frequency Transmissio
Joint Electronics Type Designation System
5940-00-784-304910-910-2 INTERCHANGEABLE
Terminal,stud
Concord Electronics, Inc.
3010-00-824-268423521 INTERCHANGEABLE
Coupling,shaft,flexible
Senior Operations Llc Dba Metal Bellows Div Metal Bellows
5340-00-854-018823521 INTERCHANGEABLE
Standoff,threaded,spacing
Hamilton Sundstrand Corporation Dba Collins Aerospace
5950-01-072-994612282754 INTERCHANGEABLE
Transformer,power
U S Army Tank Automotive Command Amsta-Im-Mm
5998-01-220-2243 INTERCHANGEABLE
Circuit Card Assembly
5950-01-348-9868 INTERCHANGEABLE
Transformer,power
Cross-Reference Index
Part NumberManufacturer
MC33-60-1 PC5 Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA)
23521 PRIMARY Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA)
MC33-53 ITEM 5 Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA)
Related Parts
5999-00-035-7893INTERCHANGEABLE
CONTACT,ELECTRICAL
23-521
2810-00-118-9025INTERCHANGEABLE
PISTON,INTERNAL COMBUSTION ENGIN
23521
5950-00-648-5403INTERCHANGEABLE
TRANSFORMER,POWER
23521
5985-00-723-4628INTERCHANGEABLE
SEAL,RADIO FREQUENCY TRANSMISSIO
MX-1554A/U
5940-00-784-3049INTERCHANGEABLE
TERMINAL,STUD
10-910-2
3010-00-824-2684INTERCHANGEABLE
COUPLING,SHAFT,FLEXIBLE
23521
5340-00-854-0188INTERCHANGEABLE
STANDOFF,THREADED,SPACING
23521
5950-01-072-9946INTERCHANGEABLE
TRANSFORMER,POWER
12282754
5998-01-220-2243INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5950-01-348-9868INTERCHANGEABLE
TRANSFORMER,POWER
5310-01-382-5020INTERCHANGEABLE
NUT,PLAIN,HEXAGON
23521
6130-01-442-4090INTERCHANGEABLE
BATTERY POWER SUPPLY
23521

Frequently Asked Questions

What is NSN 4820-01-553-0468?

NSN 4820-01-553-0468 is a Valve,safety Relief, manufactured by Circor Aerospace, Inc. Dba Circor Aerospace Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-553-0468?

NSN 4820-01-553-0468 has 3 cross-referenced part numbers: MC33-60-1 PC5 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 23521 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), MC33-53 ITEM 5 (Circor Aerospace, Inc. Dba Circor Aerospace Inc).

What NSN replaces 4820-01-553-0468?

There are 12 known substitutes for 4820-01-553-0468: 5999-00-035-7893, 2810-00-118-9025, 5950-00-648-5403 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 23521?

Key specifications for 23521: Part Name Assigned by Controlling Agency: VALVE,SHUT-OFF; End Item Identification: MANIFOLD 5VL RED. 2 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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