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55851-9 — PLUG,PROTECTIVE,DUST AND MOISTUR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

55851-9: PLUG,PROTECTIVE,DUST AND MOISTUR.

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: RUBBER, design_type: THREADED, end_item_identification: 4110-01-468-9792, material_document_and_classification: ASTM D2000 ASSN STD SINGLE MATERIAL RESPONSE, part_name_assigned_by_controlling_agency: RUBBER PLUG, SNAP-TITE EXPANDABLE. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-312-7662, 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
55851-9
NSN: 5331-01-312-7662
NIINs: 013127662, 015424933, 015884015
FSC: 5331 — O-ring
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
materialRUBBER
design_typeTHREADED
special_featuresWIDTH 0.719-1.120 MIN-MAX INCH; CONSISTS OF 6 INCH BRASS CHAIN, 1.000 DIA BRASS TAG, BRASS CAM LEVER, AND STAINLESS STEEL HARDWARE IN
end_item_identification4110-01-468-9792
material_document_and_classificationASTM D2000 ASSN STD SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyRUBBER PLUG, SNAP-TITE EXPANDABLE
NSN5331-01-312-7662
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 55851-9 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
•
CROSS-SECTIONAL HEIGHT: 0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 9.005 INCHES MINIMUM AND 9.030 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN
CENTER HOLE DIAMETER9.005 INCHES MINIMUM AND 9.030 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 2
7-311527068-17Reference document
Same NSN cross-reference
Reference document — Secondary reference
29980-2108Reference 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 55851-9?
55851-9 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace 55851-9?
There are 2 known substitutes for 55851-9: 7-311527068-17, 29980-2108. Substitute compatibility should be verified for your specific system.
What is the NSN for 55851-9?
55851-9 is cataloged in the U.S. Government catalog under NSN 5331-01-312-7662. This indicates validated use in U.S. government and defense supply chains.
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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.