PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21240KElectronic Components Assembly

Smiths Aerospace, Inc., Electronic Systems-Grand Rapids · NSN 5998-01-120-7929 · FSC 5998 · Circuit Card Assembly
Verified by PartsTable
NSN 5998-01-120-7929 — this item is cataloged by the U.S. Government under National Stock Number 5998-01-120-7929. Primary manufacturer part number: 21240K.
Features
  • Electronic Components Assembly — FSC 5998
  • 2 verified cross-references
  • Primary manufacturer: Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Electronic Components Assembly, cataloged under National Stock Number 5998-01-120-7929, is classified within Federal Supply Class 5998 (Circuit Card Assembly) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Smiths Aerospace, Inc., Electronic Systems-Grand Rapids. 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
NSN5998-01-120-7929
Primary Part Number21240K
Item NameElectronic Components Assembly
FSC / FSG5998 / 59 — Circuit Card Assembly
ManufacturerSmiths Aerospace, Inc., Electronic Systems-Grand Rapids
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
4730-00-142-107321240 INTERCHANGEABLE
Manifold,air Line
Desco Corporation
5110-00-260-1671 INTERCHANGEABLE
Reamer,hand
4520-00-487-9457 INTERCHANGEABLE
Heating Element,electrical,nonim
5940-00-983-6062 INTERCHANGEABLE
Terminal Board
5998-01-097-850221240 INTERCHANGEABLE
Circuit Card Assembly
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
5130-01-133-0461 INTERCHANGEABLE
Socket,socket Wrench
5330-01-207-9391N2124067 INTERCHANGEABLE
Gasket
Leslie Controls, Inc. Dba Leslie Controls Inc
5980-01-431-218221240 INTERCHANGEABLE
Display,optoelectronic
Giga-Tronics Incorporated Dba Giga-Tronics
6810-01-449-5390 INTERCHANGEABLE
Calcium Silicide
Cross-Reference Index
Part NumberManufacturer
21240K PRIMARY Smiths Aerospace, Inc., Electronic Systems-Grand Rapids (USA)
21240 PRIMARY Smiths Aerospace, Inc., Electronic Systems-Grand Rapids (USA)
Related Parts
4730-00-142-1073INTERCHANGEABLE
MANIFOLD,AIR LINE
21240
5110-00-260-1671INTERCHANGEABLE
REAMER,HAND
4520-00-487-9457INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
5940-00-983-6062INTERCHANGEABLE
TERMINAL BOARD
5998-01-097-8502INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
21240
5130-01-133-0461INTERCHANGEABLE
SOCKET,SOCKET WRENCH
5330-01-207-9391INTERCHANGEABLE
GASKET
N2124067
5980-01-431-2182INTERCHANGEABLE
DISPLAY,OPTOELECTRONIC
21240
6810-01-449-5390INTERCHANGEABLE
CALCIUM SILICIDE

Frequently Asked Questions

What is NSN 5998-01-120-7929?

NSN 5998-01-120-7929 is a Electronic Components Assembly, manufactured by Smiths Aerospace, Inc., Electronic Systems-Grand Rapids, classified under FSC 5998 (Circuit Card Assembly). Status: active.

What are the part numbers for NSN 5998-01-120-7929?

NSN 5998-01-120-7929 has 2 cross-referenced part numbers: 21240K (Smiths Aerospace, Inc., Electronic Systems-Grand Rapids), 21240 (Smiths Aerospace, Inc., Electronic Systems-Grand Rapids).

What NSN replaces 5998-01-120-7929?

There are 9 known substitutes for 5998-01-120-7929: 4730-00-142-1073, 5110-00-260-1671, 4520-00-487-9457 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21240K?

Key specifications for 21240K: Special Features: MOUNTING BOARD 1M CAPACITORS 38,DIODE 9,MICROCIRCUITS 37,RESISTOR 49,TRANSFORMER 1,TRANSISTOR 3; Special Features: MOUNTING BOARD 1M CAPACITORS 38,DIODE 9,MICROCIRCUITS 37,RESISTOR 49,TRANSFORMER 1,TRANSISTOR 3. 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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