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4906K21 — CAP,FILLER OPENING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4906K21: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, overall_height: 2.50 INCHES NOMINAL IN, overall_diameter: 3.375 INCHES NOMINAL IN, special_features: NUMEROUS STORAGE TANKS, style_designator: HINGE TYPE THREADED INTERNAL, locking_device_type: PADLOCK EYES. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-186-8683, 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
4906K21
NSN: 5340-01-186-8683
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialIRON OVERALL
overall_height2.50 INCHES NOMINAL IN
overall_diameter3.375 INCHES NOMINAL IN
special_featuresNUMEROUS STORAGE TANKS
style_designatorHINGE TYPE THREADED INTERNAL
locking_device_typePADLOCK EYES
thread_series_designatorNPT
system_for_which_designedNONPRESSURIZED
NSN5340-01-186-8683
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4906K21 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
•
OVERALL DIAMETER: 3.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HINGE TYPE THREADED INTERNAL
•
LOCKING DEVICE TYPE: PADLOCK EYES
•
SYSTEM FOR WHICH DESIGNED: NONPRESSURIZED
•
MATERIAL: IRON OVERALL
•
THREAD SERIES DESIGNATOR: NPT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT2.50 INCHES NOMINAL IN
OVERALL DIAMETER3.375 INCHES NOMINAL IN
STYLE DESIGNATORHINGE TYPE THREADED INTERNAL
LOCKING DEVICE TYPEPADLOCK EYES
SYSTEM FOR WHICH DESIGNEDNONPRESSURIZED
SPECIAL FEATURESNUMEROUS STORAGE TANKS
MATERIALIRON OVERALL
THREAD SERIES DESIGNATORNPT
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4906K21?
4906K21 is a CAP,FILLER OPENING.
What is the NSN for 4906K21?
4906K21 is cataloged in the U.S. Government catalog under NSN 5340-01-186-8683. 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.