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PartsTable / COMPONENT / NUMBER4
NUMBER4 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

CAP ASSEMBLY,PROTECTIVE,MUFFLER-. Key specifications include color: WHITE, drier: INCLUDED, phase: THREE, shape: RECTANGULAR W/CORNER OPTIONAL, width: 1.250 INCHES NOMINAL IN, length: 900.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-409-9605, 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
NUMBER4
NSN: 5330-00-409-9605
FSC: 5330
CAGE: 04865 — NYLTITE CORP OF AMERICA (USA)
SPECIFICATIONS
colorWHITE
drierINCLUDED
phaseTHREE
shapeRECTANGULAR W/CORNER OPTIONAL
width1.250 INCHES NOMINAL IN
length900.000 INCHES NOMINAL IN
weight4.000 POUNDS LBS
diameter3.000 INCHES NOMINAL IN
materialSTEEL,HIGH SPEED OVERALL
quantity1
body_typeSOLID
end_style90 DEGREE PARALLEL
NSN5330-00-409-9605
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NUMBER4 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
101552-1Interchangeable
interchangeable cross-reference
interchangeable
MIL-H-3868Interchangeable
interchangeable cross-reference
interchangeable
MSS0208568Interchangeable
interchangeable cross-reference
interchangeable
55Interchangeable
interchangeable cross-reference
interchangeable
NUMBER 4Interchangeable
interchangeable cross-reference
interchangeable
77-200Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NUMBER4?
NUMBER4 is a CAP ASSEMBLY,PROTECTIVE,MUFFLER-.
What parts can replace NUMBER4?
There are 8 known substitutes for NUMBER4: 101552-1, MIL-H-3868, MSS0208568 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NUMBER4?
NUMBER4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-409-9605. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026