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Technical Data Sheet
21978H ✓ 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

The SPRING,HELICAL,COMPRESSION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1065 OVERALL, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, inside_diameter: 0.375 INCHES NOMINAL IN, style_designator: CYLINDRICAL, surface_treatment: VARNISH OVERALL, spring_free_length: 1.469 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5360-00-378-7218, 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
21978H
NSN: 5360-00-378-7218
FSC: 5360
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialSTEEL COMP 1065 OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
coil_quantity8
inside_diameter0.375 INCHES NOMINAL IN
style_designatorCYLINDRICAL
surface_treatmentVARNISH OVERALL
spring_free_length1.469 INCHES NOMINAL IN
spring_solid_length0.500 INCHES MAXIMUM IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
spring_free_outside_diameter0.485 INCHES NOMINAL IN
spring_solid_outside_diameter0.500 INCHES MAXIMUM IN
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OR SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5360-00-378-7218
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING,HELICAL,COMPRESSION TITLE COMPONENT PN 21978H MFR SPRING,HELICAL,COMPRES
KEY FEATURES
INSIDE DIAMETER: 0.375 INCHES NOMINAL IN
STYLE DESIGNATOR: CYLINDRICAL
ACCOMMODATED ROD DIAMETER: 0.313 INCHES NOMINAL IN
COIL HELIX DIRECTION: RIGHT-HAND OR LEFT-HAND
SPRING SOLID OUTSIDE DIAMETER: 0.500 INCHES NOMINAL IN
MATERIAL: STEEL OVERALL
COIL QUANTITY: 9
BORE DIAMETER: 0.531 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
INSIDE DIAMETER0.375 INCHES NOMINAL IN
STYLE DESIGNATORCYLINDRICAL
ACCOMMODATED ROD DIAMETER0.313 INCHES NOMINAL IN
COIL HELIX DIRECTIONRIGHT-HAND OR LEFT-HAND
SPRING SOLID OUTSIDE DIAMETER0.500 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
COIL QUANTITY9
BORE DIAMETER0.531 INCHES NOMINAL IN
SPRING FREE LENGTH1.250 INCHES NOMINAL IN
LOAD RATING16.830 POUNDS MINIMUM AND 20.570 POUNDS MAXIMUM LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
29137Interchangeable
interchangeable cross-reference
interchangeable
1161103Interchangeable
interchangeable cross-reference
interchangeable
72551Interchangeable
interchangeable cross-reference
interchangeable
353974Interchangeable
interchangeable cross-reference
interchangeable
A36016XInterchangeable
interchangeable cross-reference
interchangeable
0000000137#Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21978H?
21978H is a SPRING,HELICAL,COMPRESSION.
What parts can replace 21978H?
There are 10 known substitutes for 21978H: 29137, 1161103, 72551 and 7 more. Substitute compatibility should be verified for your specific system.
Is 21978H still available?
21978H is currently cancelled.
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