PartsTable
Technical Data Sheet
Download PDF

77954 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

77954: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include design_type: THREADED, overall_diameter: 0.875 INCHES NOMINAL IN, special_features: RUBBER GASKET INSERTED IN CAP, nondefinitive_spec/std_data: 2 TYPE AND A CLASS AND 4 SIZE, thread_size_and_series/type_designator: 7/16-20 UNF. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-291-3537, 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
77954
NSN: 5340-00-291-3537
FSC: 5340 — Hardware, Commercial
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
design_typeTHREADED
overall_diameter0.875 INCHES NOMINAL IN
special_featuresRUBBER GASKET INSERTED IN CAP
nondefinitive_spec/std_data2 TYPE AND A CLASS AND 4 SIZE
thread_size_and_series/type_designator7/16-20 UNF
NSN5340-00-291-3537
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 77954 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
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 0.875 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND A CLASS AND 4 SIZE
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 7/16-20 UNF
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.875 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND A CLASS AND 4 SIZE
SPECIAL FEATURESRUBBER GASKET INSERTED IN CAP
THREAD SIZE AND SERIES/TYPE DESIGNATOR7/16-20 UNF
SUBSTITUTES & CROSS-REFERENCES 4
8982268Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
39A33Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
132659Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5340PL1879930Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy 77954?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 77954?
77954 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 77954?
There are 4 known substitutes for 77954: 8982268, 39A33, 132659 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 77954?
77954 is cataloged in the U.S. Government catalog under NSN 5340-00-291-3537. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 77954

✓ 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.