PartsTable
Technical Data Sheet
Download PDF

N351CD20 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

N351CD20: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include design_type: THREADED, thread_class: 2B, overall_diameter: 2.625 INCHES NOMINAL IN, inside_diameter_length: 0.563 INCHES NOMINAL IN, round_cap_outside_surface_condition: KNURLED OR RIBBED OR SERRATED OR SMOOTH, thread_size_and_series/type_designator: 1.625-12 UN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-200-6379, 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
N351CD20
NSN: 5340-00-200-6379
FSC: 5340 — Hardware, Commercial
CAGE: F2521 — BIO-RAD (FRA)
SPECIFICATIONS
design_typeTHREADED
thread_class2B
overall_diameter2.625 INCHES NOMINAL IN
inside_diameter_length0.563 INCHES NOMINAL IN
round_cap_outside_surface_conditionKNURLED OR RIBBED OR SERRATED OR SMOOTH
thread_size_and_series/type_designator1.625-12 UN
NSN5340-00-200-6379
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: N351CD20 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: THREADED
•
OVERALL DIAMETER: 2.625 INCHES NOMINAL IN
•
THREAD CLASS: 2B
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1.625-12 UN
•
INSIDE DIAMETER LENGTH: 0.563 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: KNURLED OR RIBBED OR SERRATED OR SMOOTH
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER2.625 INCHES NOMINAL IN
THREAD CLASS2B
THREAD SIZE AND SERIES/TYPE DESIGNATOR1.625-12 UN
INSIDE DIAMETER LENGTH0.563 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONKNURLED OR RIBBED OR SERRATED OR SMOOTH
SUBSTITUTES & CROSS-REFERENCES 1
CD20Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
Ready to buy N351CD20?
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 N351CD20?
N351CD20 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace N351CD20?
There is 1 known substitute for N351CD20: CD20. Substitute compatibility should be verified for your specific system.
What is the NSN for N351CD20?
N351CD20 is cataloged in the U.S. Government catalog under NSN 5340-00-200-6379. 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 — N351CD20

✓ 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.