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76857A — CAP,FILLER OPENING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

76857A: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2B, overall_height: 0.656 INCHES NOMINAL IN, thread_diameter: 0.6880 INCHES NOMINAL IN, thread_quantity: 32.000 PER INCH, outside_diameter: 0.859 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-362-6678, 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
76857A
NSN: 5340-00-362-6678
FSC: 5340 — Hardware, Commercial
CAGE: 1ML14 — BRINKLEY TECHNOLOGY GROUP LLC DBA HERCULES MANUFACTURING (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2B
overall_height0.656 INCHES NOMINAL IN
thread_diameter0.6880 INCHES NOMINAL IN
thread_quantity32.000 PER INCH
outside_diameter0.859 INCHES NOMINAL IN
style_designatorCIRCULAR TYPE THREADED INTERNAL
surface_treatmentOXIDE OVERALL
accommodation_typeHEXAGON END GRIPPING
thread_series_designatorUN
system_for_which_designedNONPRESSURIZED
filler_neck_diameter_for_which_designed0.688 INCHES NOMINAL IN
NSN5340-00-362-6678
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 76857A 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
•
STYLE DESIGNATOR: CIRCULAR TYPE THREADED INTERNAL
•
FILLER NECK DIAMETER FOR WHICH DESIGNED: 0.688 INCHES NOMINAL IN
•
THREAD DIAMETER: 0.6880 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.859 INCHES NOMINAL IN
•
SYSTEM FOR WHICH DESIGNED: NONPRESSURIZED
•
COLOR: BLACK
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.656 INCHES NOMINAL IN
ACCOMMODATION TYPEHEXAGON END GRIPPING
STYLE DESIGNATORCIRCULAR TYPE THREADED INTERNAL
FILLER NECK DIAMETER FOR WHICH DESIGNED0.688 INCHES NOMINAL IN
THREAD DIAMETER0.6880 INCHES NOMINAL IN
OUTSIDE DIAMETER0.859 INCHES NOMINAL IN
SYSTEM FOR WHICH DESIGNEDNONPRESSURIZED
COLORBLACK
SURFACE TREATMENTOXIDE OVERALL
THREAD CLASS2B
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 4
3871PC13Reference document
Same NSN cross-reference
Reference document — Secondary reference
WMU2A1XReference document
Same NSN cross-reference
Reference document — Secondary reference
YP249S41-70PC13Reference document
Same NSN cross-reference
Reference document — Secondary reference
WMU2A0XReference 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 76857A?
76857A is a CAP,FILLER OPENING.
What parts can replace 76857A?
There are 4 known substitutes for 76857A: 3871PC13, WMU2A1X, YP249S41-70PC13 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 76857A?
76857A is cataloged in the U.S. Government catalog under NSN 5340-00-362-6678. 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.