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Y18742 — CAP,FILLER OPENING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

Y18742: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, overall_height: 1.375 INCHES NOMINAL IN, sealing_length: 0.875 INCHES NOMINAL IN, outside_diameter: 3.125 INCHES NOMINAL IN, special_markings: 7 LBS LBS, style_designator: CLOSED COOLING SYSTEM TYPE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-497-7843, 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
Y18742
NSN: 5340-00-497-7843
FSC: 5340 — Hardware, Commercial
CAGE: 64104 — DRESSER, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cam_quantity2
overall_height1.375 INCHES NOMINAL IN
sealing_length0.875 INCHES NOMINAL IN
outside_diameter3.125 INCHES NOMINAL IN
special_markings7 LBS LBS
style_designatorCLOSED COOLING SYSTEM TYPE
surface_treatmentCADMIUM OVERALL
accommodation_typeLOBES END GRIPPING
pressure_relief_methodAUTOMATIC
maximum_working_pressure7.000 POUNDS PER SQUARE INCH (PSI) LBS
system_for_which_designedPRESSURIZED
NSN5340-00-497-7843
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: Y18742 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
•
ACCOMMODATION TYPE: LOBES END GRIPPING
•
STYLE DESIGNATOR: CLOSED COOLING SYSTEM TYPE
•
FILLER NECK DIAMETER FOR WHICH DESIGNED: 1.625 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 3.125 INCHES NOMINAL IN
•
CAM QUANTITY: 2
•
SYSTEM FOR WHICH DESIGNED: PRESSURIZED
•
PRESSURE RELIEF METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.375 INCHES NOMINAL IN
ACCOMMODATION TYPELOBES END GRIPPING
STYLE DESIGNATORCLOSED COOLING SYSTEM TYPE
FILLER NECK DIAMETER FOR WHICH DESIGNED1.625 INCHES NOMINAL IN
OUTSIDE DIAMETER3.125 INCHES NOMINAL IN
CAM QUANTITY2
SYSTEM FOR WHICH DESIGNEDPRESSURIZED
PRESSURE RELIEF METHODAUTOMATIC
SURFACE TREATMENTCADMIUM OVERALL
MAXIMUM WORKING PRESSURE7.000 POUNDS PER SQUARE INCH (PSI) LBS
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 1
G13542Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is Y18742?
Y18742 is a CAP,FILLER OPENING.
What parts can replace Y18742?
There is 1 known substitute for Y18742: G13542. Substitute compatibility should be verified for your specific system.
What is the NSN for Y18742?
Y18742 is cataloged in the U.S. Government catalog under NSN 5340-00-497-7843. 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.