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Technical Data Sheet

M85049/138-55B — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M85049/138-55B: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, overall_height: 0.625 INCHES NOMINAL IN, overall_diameter: 1.875 INCHES NOMINAL IN, special_features: YELLOW, part_name_assigned_by_controlling_agency: ELECTRICAL,CAP,DUST, tube_outside_diameter_for_which_designed: 1.718 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-675-6583, 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
M85049/138-55B
NSN: 5340-01-675-6583
FSC: 5340 — Hardware, Commercial
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialPLASTIC
overall_height0.625 INCHES NOMINAL IN
overall_diameter1.875 INCHES NOMINAL IN
special_featuresYELLOW
part_name_assigned_by_controlling_agencyELECTRICAL,CAP,DUST
tube_outside_diameter_for_which_designed1.718 INCHES NOMINAL IN
opening_inside_diameter_for_which_designed1.648 INCHES NOMINAL IN
NSN5340-01-675-6583
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85049/138-55B 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: 1.875 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 1.718 INCHES NOMINAL IN
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 1.648 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.625 INCHES NOMINAL IN
OVERALL DIAMETER1.875 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED1.718 INCHES NOMINAL IN
OPENING INSIDE DIAMETER FOR WHICH DESIGNED1.648 INCHES NOMINAL IN
SPECIAL FEATURESYELLOW
PART NAME ASSIGNED BY CONTROLLING AGENCYELECTRICAL,CAP,DUST
MATERIALPLASTIC
SUBSTITUTES & CROSS-REFERENCES 1
SAE-AS85049/138Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M85049/138-55B?
M85049/138-55B is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace M85049/138-55B?
There is 1 known substitute for M85049/138-55B: SAE-AS85049/138. Substitute compatibility should be verified for your specific system.
What is the NSN for M85049/138-55B?
M85049/138-55B is cataloged in the U.S. Government catalog under NSN 5340-01-675-6583. 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.