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21389A — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

21389A: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: RUBBER, design_type: FRICTION, overall_diameter: 1.930 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN, opening_inside_diameter_for_which_designed: 1.300 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-412-1745, 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
21389A
NSN: 5340-01-412-1745
FSC: 5340 — Hardware, Commercial
CAGE: 76385 — MINOR RUBBER CO INC (USA)
SPECIFICATIONS
materialRUBBER
design_typeFRICTION
overall_diameter1.930 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
opening_inside_diameter_for_which_designed1.300 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
NSN5340-01-412-1745
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21389A 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
•
DESIGN TYPE: FRICTION
•
OVERALL DIAMETER: 1.930 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 1.300 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER1.930 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
OPENING INSIDE DIAMETER FOR WHICH DESIGNED1.300 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
MATERIALRUBBER
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
13228E6261Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21389A?
21389A is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 21389A?
There is 1 known substitute for 21389A: 13228E6261. Substitute compatibility should be verified for your specific system.
What is the NSN for 21389A?
21389A is cataloged in the U.S. Government catalog under NSN 5340-01-412-1745. 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.