PartsTable
Technical Data Sheet
Download PDF

10-21494 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
3M · ORING SEAL
PRODUCT OVERVIEW

10-21494: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include design_type: FRICTION, thread_class: 2A A, thread_size_and_series/type_designator: 0.687-24 UNEF, opening_inside_diameter_for_which_designed: 0.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-090-4742, 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
10-21494
NSN: 5340-00-090-4742
FSC: 5340 — Hardware, Commercial
CAGE: 77820 — AMPHENOL CORP DIV AMPHENOL AEROSPACE OPERATIONS (USA)
SPECIFICATIONS
design_typeFRICTION
thread_class2A A
thread_size_and_series/type_designator0.687-24 UNEF
opening_inside_diameter_for_which_designed0.500 INCHES NOMINAL IN
NSN5340-00-090-4742
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 10-21494 MFR: 3M ⚠ 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
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 0.500 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.687-24 UNEF
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OPENING INSIDE DIAMETER FOR WHICH DESIGNED0.500 INCHES NOMINAL IN
THREAD CLASS2A A
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.687-24 UNEF
SUBSTITUTES & CROSS-REFERENCES 4
22294Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
12976Reference document
Same NSN cross-reference
Reference document — Secondary reference
53189Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
84905Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 10-21494?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 10-21494?
10-21494 is a CAP,PROTECTIVE,DUST AND MOISTURE manufactured by 3M.
What parts can replace 10-21494?
There are 4 known substitutes for 10-21494: 22294, 12976, 53189 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 10-21494?
10-21494 is cataloged in the U.S. Government catalog under NSN 5340-00-090-4742. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 10-21494

✓ 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.