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PartsTable / COMPONENT / SP21MA
SP21MA ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

HEATING ELEMENT,ELECTRICAL,NONIM. Key specifications include material: NICKEL ALLOY, ring_style: HOOKED WIRE, portability: NONPORTABLE, circuit_type: VOICE FREQUENCY, usage_design: INTERNAL, overall_width: 2.090 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4520-00-451-1235, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
SP21MA
NSN: 4520-00-451-1235
FSC: 4520
CAGE: 65586 — CHROMALOX INC DBA CHROMALOX PRECISION HEAT AND CONTROL, INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY
ring_styleHOOKED WIRE
portabilityNONPORTABLE
circuit_typeVOICE FREQUENCY
usage_designINTERNAL
overall_width2.090 INCHES NOMINAL IN
overall_height0.844 INCHES NOMINAL IN
overall_length3.791 INCHES NOMINAL IN
inside_diameter0.851 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN
bore_counterboreNOT INCLUDED
bore_countersinkNOT INCLUDED
outside_diameter0.980 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
NSN4520-00-451-1235
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available HEATING ELEMENT,ELECTRICAL,NONIM TITLE COMPONENT PN SP21MA MFR HEATING ELEMENT,ELECTR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
57385Interchangeable
interchangeable cross-reference
interchangeable
1A60407Interchangeable
interchangeable cross-reference
interchangeable
ERA264Interchangeable
interchangeable cross-reference
interchangeable
25195Interchangeable
interchangeable cross-reference
interchangeable
009-57385Interchangeable
interchangeable cross-reference
interchangeable
09-57385Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SP21MA?
SP21MA is a HEATING ELEMENT,ELECTRICAL,NONIM.
What parts can replace SP21MA?
There are 15 known substitutes for SP21MA: 57385, 1A60407, ERA264 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SP21MA?
SP21MA is cataloged in the Federal Logistics Information System (FLIS) under NSN 4520-00-451-1235. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026