PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21240Calcium Silicide

Sigma-Aldrich Corporation · NSN 6810-01-449-5390 · FSC 6810 · No Item Name Available
Verified by PartsTable
NSN 6810-01-449-5390 — this item is cataloged by the U.S. Government under National Stock Number 6810-01-449-5390. Primary manufacturer part number: 21240.
Features
  • Calcium Silicide — FSC 6810
  • 3 verified cross-references
  • Primary manufacturer: Sigma-Aldrich Corporation
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Calcium Silicide, cataloged under National Stock Number 6810-01-449-5390, is classified within Federal Supply Class 6810 (No Item Name Available) of the Chemicals and Chemical Products group. The primary manufacturer of record is Sigma-Aldrich Corporation. This item has 3 commercial cross-references from 3 manufacturers, 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
NSN6810-01-449-5390
Primary Part Number21240
Item NameCalcium Silicide
FSC / FSG6810 / 68 — No Item Name Available
ManufacturerSigma-Aldrich Corporation
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4730-00-142-107321240 INTERCHANGEABLE
Manifold,air Line
Desco Corporation
5950-00-243-5125 INTERCHANGEABLE
Transformer,power
5110-00-260-1671 INTERCHANGEABLE
Reamer,hand
2910-00-358-4508146-76 INTERCHANGEABLE
Parts Kit,carburetor
Cummins Power Generation Inc.
4520-00-487-9457 INTERCHANGEABLE
Heating Element,electrical,nonim
5325-00-802-885869825-21-6 INTERCHANGEABLE
Insert,screw Thread
Hamilton Sundstrand Corporation Dba Collins Aerospace
5940-00-983-6062 INTERCHANGEABLE
Terminal Board
9540-01-009-7327 INTERCHANGEABLE
Channel,structural
5998-01-097-850221240 INTERCHANGEABLE
Circuit Card Assembly
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
5998-01-120-792921240 INTERCHANGEABLE
Electronic Components Assembly
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
Cross-Reference Index
Part NumberManufacturer
21240 Sigma-Aldrich Corporation (USA)
14676 Johnson Matthey Catalog Co (USA)
21240 Aldrich Chemical Co Inc Sub of Sigma Aldrich Corp (USA)
Related Parts
4730-00-142-1073INTERCHANGEABLE
MANIFOLD,AIR LINE
21240
5950-00-243-5125INTERCHANGEABLE
TRANSFORMER,POWER
5110-00-260-1671INTERCHANGEABLE
REAMER,HAND
2910-00-358-4508INTERCHANGEABLE
PARTS KIT,CARBURETOR
146-76
4520-00-487-9457INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
5325-00-802-8858INTERCHANGEABLE
INSERT,SCREW THREAD
69825-21-6
5940-00-983-6062INTERCHANGEABLE
TERMINAL BOARD
9540-01-009-7327INTERCHANGEABLE
CHANNEL,STRUCTURAL
5998-01-097-8502INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
21240
5998-01-120-7929INTERCHANGEABLE
ELECTRONIC COMPONENTS ASSEMBLY
21240
5130-01-133-0461INTERCHANGEABLE
SOCKET,SOCKET WRENCH
5945-01-196-0816INTERCHANGEABLE
RELAY

Frequently Asked Questions

What is NSN 6810-01-449-5390?

NSN 6810-01-449-5390 is a Calcium Silicide, manufactured by Sigma-Aldrich Corporation, classified under FSC 6810 (No Item Name Available). Status: active.

What are the part numbers for NSN 6810-01-449-5390?

NSN 6810-01-449-5390 has 3 cross-referenced part numbers: 21240 (Sigma-Aldrich Corporation), 14676 (Johnson Matthey Catalog Co), 21240 (Aldrich Chemical Co Inc Sub of Sigma Aldrich Corp).

What NSN replaces 6810-01-449-5390?

There are 12 known substitutes for 6810-01-449-5390: 4730-00-142-1073, 5950-00-243-5125, 5110-00-260-1671 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21240?

Key specifications for 21240: Special Features: SHINY GREY METALLIC CHIPS AND POWDER. 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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