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Technical Data Sheet
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20021A — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

20021A: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include end_item_identification: 26 FT TRAILER P/N 26TANB FT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-358-3417, 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
20021A
NSN: 5340-00-358-3417
NIINs: 003583417, 016337699
FSC: 5340 — Hardware, Commercial
CAGE: 1ML14 — BRINKLEY TECHNOLOGY GROUP LLC DBA HERCULES MANUFACTURING (USA)
SPECIFICATIONS
end_item_identification26 FT TRAILER P/N 26TANB FT
NSN5340-00-358-3417
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 20021A MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
COUNTERSINK ANGLE IN DEG: 30.0
•
FSC APPLICATION DATA: ENGINE,GASOLINE,NONAIRCRAFT
•
FIRST STEP DIAMETER: 1.1550 INCHES MINIMUM AND 1.1650 INCHES MAXIMUM IN
•
END DIAMETER: 0.8960 INCHES MINIMUM AND 0.9060 INCHES MAXIMUM IN
•
COUNTERSINK DIAMETER: 0.9330 INCHES MINIMUM AND 0.9380 INCHES MAXIMUM IN
•
DISTANCE FROM END TO FIRST STEP: 0.2920 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.3860 INCHES NOMINAL IN
COUNTERSINK ANGLE IN DEG30.0
FSC APPLICATION DATAENGINE,GASOLINE,NONAIRCRAFT
FIRST STEP DIAMETER1.1550 INCHES MINIMUM AND 1.1650 INCHES MAXIMUM IN
END DIAMETER0.8960 INCHES MINIMUM AND 0.9060 INCHES MAXIMUM IN
COUNTERSINK DIAMETER0.9330 INCHES MINIMUM AND 0.9380 INCHES MAXIMUM IN
DISTANCE FROM END TO FIRST STEP0.2920 INCHES NOMINAL IN
DESIGN TYPESOLID
MATERIAL DOCUMENT AND CLASSIFICATIONAISI B1113 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 1113 ASSN STD SINGLE MATERIAL RESPONSE
COUNTERBORE LENGTH0.2820 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
R683Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 20021A?
20021A is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 20021A?
There is 1 known substitute for 20021A: R683. Substitute compatibility should be verified for your specific system.
What is the NSN for 20021A?
20021A is cataloged in the U.S. Government catalog under NSN 5340-00-358-3417. 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.