PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6621Electron Tube

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5960-00-553-5475 · FSC 5960 · No Item Name Available
Verified by PartsTable
NSN 5960-00-553-5475 — this item is cataloged by the U.S. Government under National Stock Number 5960-00-553-5475. Primary manufacturer part number: 6621.
Features
  • Electron Tube — FSC 5960
  • Envelope Medium Type: GAS
  • Nondefinitive Spec/std Data: 6621 TYPE
  • 2 verified cross-references
  • Primary manufacturer: Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
General Description

The Electron Tube, cataloged under National Stock Number 5960-00-553-5475, is classified within Federal Supply Class 5960 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5960-00-553-5475
Primary Part Number6621
Item NameElectron Tube
FSC / FSG5960 / 59 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Envelope Medium TypeGAS
Nondefinitive Spec/std Data6621 TYPE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5340-00-061-28396621 INTERCHANGEABLE
Clamp,loop
Walker Mfg Co
5935-00-089-7142160671 INTERCHANGEABLE
Connector,plug,electrical
Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems
6250-00-781-618466-21 INTERCHANGEABLE
Ballast,lamp
Day-Ray Products, Inc
5340-01-010-3840 INTERCHANGEABLE
Loop,strap Fastener
6680-01-049-099253G-0206M-001 INTERCHANGEABLE
Tube,metering
Ametek Inc Schutte and Koerting Div
2920-01-243-00596621 INTERCHANGEABLE
Lead Set,ignition,engine
Standard Motor Products
5945-01-421-17866621 INTERCHANGEABLE
Solenoid,electrical
Rocker Solenoid Co Dba Rocker Solenoid Co
4920-01-573-62766621 INTERCHANGEABLE
Tire,aircraft,mater
Pdi Ground Support Systems, Inc.
5985-01-650-32296621 INTERCHANGEABLE
Coupler,directional
Edro Corporation, the Dba Edro Corp
Cross-Reference Index
Part NumberManufacturer
6621 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-E-1/886 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5340-00-061-2839INTERCHANGEABLE
CLAMP,LOOP
6621
5935-00-089-7142INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
160671
6250-00-781-6184INTERCHANGEABLE
BALLAST,LAMP
66-21
5340-01-010-3840INTERCHANGEABLE
LOOP,STRAP FASTENER
6680-01-049-0992INTERCHANGEABLE
TUBE,METERING
53G-0206M-001
2920-01-243-0059INTERCHANGEABLE
LEAD SET,IGNITION,ENGINE
6621
5945-01-421-1786INTERCHANGEABLE
SOLENOID,ELECTRICAL
6621
4920-01-573-6276INTERCHANGEABLE
TIRE,AIRCRAFT,MATER
6621
5985-01-650-3229INTERCHANGEABLE
COUPLER,DIRECTIONAL
6621

Frequently Asked Questions

What is NSN 5960-00-553-5475?

NSN 5960-00-553-5475 is a Electron Tube, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5960 (No Item Name Available). Status: active.

What are the part numbers for NSN 5960-00-553-5475?

NSN 5960-00-553-5475 has 2 cross-referenced part numbers: 6621 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-E-1/886 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5960-00-553-5475?

There are 9 known substitutes for 5960-00-553-5475: 5340-00-061-2839, 5935-00-089-7142, 6250-00-781-6184 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6621?

Key specifications for 6621: Special Features: MFTR. CLASSIFICATION:SWITCHING,PRE TR AND ATR; ENVELOPE MATERIAL:GLASS; Envelope Medium Type: GAS; Nondefinitive Spec/std Data: 6621 TYPE. 3 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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