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ER7881 — CAP,FILLER OPENING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ER7881: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include thread_class: 2A A, thread_length: 0.340 INCHES NOMINAL IN, overall_height: 0.660 INCHES NOMINAL IN, thread_diameter: 0.7500 INCHES NOMINAL IN, style_designator: THREADED TYPE EXTERNAL, accommodation_type: HEXAGON END GRIPPING. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-077-8593, 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
ER7881
NSN: 5340-01-077-8593
FSC: 5340 — Hardware, Commercial
CAGE: 19954 — EATON CORP FLUID POWER OPNS MARSHALL DIV (USA)
SPECIFICATIONS
thread_class2A A
thread_length0.340 INCHES NOMINAL IN
overall_height0.660 INCHES NOMINAL IN
thread_diameter0.7500 INCHES NOMINAL IN
style_designatorTHREADED TYPE EXTERNAL
accommodation_typeHEXAGON END GRIPPING
thread_series_designatorUNF
NSN5340-01-077-8593
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ER7881 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: HEXAGON END GRIPPING
•
THREAD LENGTH: 0.340 INCHES NOMINAL IN
•
STYLE DESIGNATOR: THREADED TYPE EXTERNAL
•
THREAD DIAMETER: 0.7500 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.660 INCHES NOMINAL IN
ACCOMMODATION TYPEHEXAGON END GRIPPING
THREAD LENGTH0.340 INCHES NOMINAL IN
STYLE DESIGNATORTHREADED TYPE EXTERNAL
THREAD DIAMETER0.7500 INCHES NOMINAL IN
THREAD CLASS2A A
THREAD SERIES DESIGNATORUNF
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 ER7881?
ER7881 is a CAP,FILLER OPENING.
What is the NSN for ER7881?
ER7881 is cataloged in the U.S. Government catalog under NSN 5340-01-077-8593. 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.