PartsTable
Technical Data Sheet

M85049/138-18B — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M85049/138-18B: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: MOLDED, overall_diameter: 0.750 INCHES NOMINAL IN, special_features: ELECTROSTATIC FREE MATERIAL, COLOR BLACK, CONFORMING TO MIL-PRF-81705, TYPE I, part_name_assigned_by_controlling_agency: CONNECTOR ACCESSORIES,ELECTRICAL,CAP,DUST PLASTIC, CAT 9, opening_inside_diameter_for_which_designed: 0.530 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-675-5078, 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
M85049/138-18B
NSN: 5340-01-675-5078
FSC: 5340 — Hardware, Commercial
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialPLASTIC
design_typeMOLDED
overall_diameter0.750 INCHES NOMINAL IN
special_featuresELECTROSTATIC FREE MATERIAL, COLOR BLACK, CONFORMING TO MIL-PRF-81705, TYPE I
part_name_assigned_by_controlling_agencyCONNECTOR ACCESSORIES,ELECTRICAL,CAP,DUST PLASTIC, CAT 9
opening_inside_diameter_for_which_designed0.530 INCHES NOMINAL IN
NSN5340-01-675-5078
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85049/138-18B 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: MOLDED
•
OVERALL DIAMETER: 0.750 INCHES NOMINAL IN
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 0.530 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS
DESIGN TYPEMOLDED
OVERALL DIAMETER0.750 INCHES NOMINAL IN
OPENING INSIDE DIAMETER FOR WHICH DESIGNED0.530 INCHES NOMINAL IN
SPECIAL FEATURESELECTROSTATIC FREE MATERIAL, COLOR BLACK, CONFORMING TO MIL-PRF-81705, TYPE I
PART NAME ASSIGNED BY CONTROLLING AGENCYCONNECTOR ACCESSORIES,ELECTRICAL,CAP,DUST PLASTIC, CAT 9
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 M85049/138-18B?
M85049/138-18B is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace M85049/138-18B?
There is 1 known substitute for M85049/138-18B: SAE-AS85049/138. Substitute compatibility should be verified for your specific system.
What is the NSN for M85049/138-18B?
M85049/138-18B is cataloged in the U.S. Government catalog under NSN 5340-01-675-5078. 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.