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99-4126-6 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

99-4126-6: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: ALUMINUM, design_type: FRICTION, end_item_identification: AIRCRAFT, AIRLIFTER C-17A; AIRCRAFT, PHANTOM F-4; HELICOPTER, CH-53A/D/E A, tube_outside_diameter_for_which_designed: 0.375 INCHES NOMINAL IN, opening_inside_diameter_for_which_designed: 0.578 INCHES NOMINAL IN, connector_nominal_thread_size_for_which_designed: 0.562 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-160-3441, 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
99-4126-6
NSN: 5340-01-160-3441
FSC: 5340 — Hardware, Commercial
CAGE: 55820 — RTX CORPORATION DIV PRATT & WHITNEY (USA)
SPECIFICATIONS
materialALUMINUM
design_typeFRICTION
end_item_identificationAIRCRAFT, AIRLIFTER C-17A; AIRCRAFT, PHANTOM F-4; HELICOPTER, CH-53A/D/E A
tube_outside_diameter_for_which_designed0.375 INCHES NOMINAL IN
opening_inside_diameter_for_which_designed0.578 INCHES NOMINAL IN
connector_nominal_thread_size_for_which_designed0.562 INCHES IN
NSN5340-01-160-3441
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 99-4126-6 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
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.375 INCHES NOMINAL IN
•
CONNECTOR NOMINAL THREAD SIZE FOR WHICH DESIGNED: 0.562 INCHES IN
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 0.578 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.375 INCHES NOMINAL IN
CONNECTOR NOMINAL THREAD SIZE FOR WHICH DESIGNED0.562 INCHES IN
OPENING INSIDE DIAMETER FOR WHICH DESIGNED0.578 INCHES NOMINAL IN
END ITEM IDENTIFICATIONAIRCRAFT, AIRLIFTER C-17A; AIRCRAFT, PHANTOM F-4; HELICOPTER, CH-53A/D/E A
MATERIALALUMINUM
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 99-4126-6?
99-4126-6 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for 99-4126-6?
99-4126-6 is cataloged in the U.S. Government catalog under NSN 5340-01-160-3441. 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.