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SEC-26 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

SEC-26: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, POLYETHYLENE (PP), design_type: FRICTION, overall_diameter: 1.910 INCHES NOMINAL IN, connector_nominal_thread_size_for_which_designed: 1.625 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-540-7749, 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
SEC-26
NSN: 5340-01-540-7749
FSC: 5340 — Hardware, Commercial
CAGE: 99017 — CAPLUGS LLC DBA MOKON DIV CAPLUGS (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeFRICTION
overall_diameter1.910 INCHES NOMINAL IN
connector_nominal_thread_size_for_which_designed1.625 INCHES IN
NSN5340-01-540-7749
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SEC-26 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: 1.910 INCHES NOMINAL IN
•
CONNECTOR NOMINAL THREAD SIZE FOR WHICH DESIGNED: 1.625 INCHES IN
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER1.910 INCHES NOMINAL IN
CONNECTOR NOMINAL THREAD SIZE FOR WHICH DESIGNED1.625 INCHES IN
MATERIALPLASTIC, POLYETHYLENE (PP)
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 3
MS90376-26RFSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
91867169Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS90376-26RFReference document
Same NSN cross-reference
Reference document — Design control — primary 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 SEC-26?
SEC-26 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace SEC-26?
There are 3 known substitutes for SEC-26: MS90376-26RF, 91867169, AS90376-26RF. Substitute compatibility should be verified for your specific system.
What is the NSN for SEC-26?
SEC-26 is cataloged in the U.S. Government catalog under NSN 5340-01-540-7749. 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.