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ST21D21 — INSULATOR,WASHER

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

ST21D21: INSULATOR,WASHER.

The INSULATOR,WASHER is a the manufacturer industrial component. Key specifications include overall_height: 0.002 INCHES NOMINAL IN, inside_diameter: 0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN, outside_diameter: 0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN, style_designator: ROUND, FLAT, unable_to_decode: UNABLE TO DECODE. This part is cataloged in the U.S.

Government catalog under NSN 5970-00-133-4840, 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
ST21D21
NSN: 5970-00-133-4840
FSC: 5970 — Electrical Insulators and Insulating Materials
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
overall_height0.002 INCHES NOMINAL IN
inside_diameter0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
outside_diameter0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
style_designatorROUND, FLAT
unable_to_decodeUNABLE TO DECODE
NSN5970-00-133-4840
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available INSULATOR,WASHER TITLE COMPONENT PN ST21D21 MFR INSULATOR,WASHER
KEY FEATURES
•
STYLE DESIGNATOR: ROUND, FLAT
•
OUTSIDE DIAMETER: 0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
•
UNABLE TO DECODE: UNABLE TO DECODE
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.002 INCHES NOMINAL IN
STYLE DESIGNATORROUND, FLAT
OUTSIDE DIAMETER0.547 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
INSIDE DIAMETER0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
UNABLE TO DECODEUNABLE TO DECODE
SUBSTITUTES & CROSS-REFERENCES 8
3180099-18Reference document
Same NSN cross-reference
Reference document — Secondary reference
43-02-10Reference document
Same NSN cross-reference
Reference document — Secondary reference
T511005518Reference document
Same NSN cross-reference
Reference document — Secondary reference
270-001-250Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
71502-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-I-38526/1Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST21D21?
ST21D21 is a INSULATOR,WASHER.
What parts can replace ST21D21?
There are 8 known substitutes for ST21D21: 3180099-18, 43-02-10, T511005518 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST21D21?
ST21D21 is cataloged in the U.S. Government catalog under NSN 5970-00-133-4840. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.