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Technical Data Sheet

M85049/138-20B — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

M85049/138-20B: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: FRICTION, overall_diameter: 0.809 INCHES MINIMUM AND 0.871 INCHES MAXIMUM IN, inside_diameter_length: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN, material_document_and_classification: MIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE, tube_outside_diameter_for_which_designed: 0.595 INCHES MINIMUM AND 0.615 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-319-4912, 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
M85049/138-20B
NSN: 5340-01-319-4912
FSC: 5340 — Hardware, Commercial
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialPLASTIC
design_typeFRICTION
overall_diameter0.809 INCHES MINIMUM AND 0.871 INCHES MAXIMUM IN
inside_diameter_length0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
material_document_and_classificationMIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
tube_outside_diameter_for_which_designed0.595 INCHES MINIMUM AND 0.615 INCHES MAXIMUM IN
NSN5340-01-319-4912
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M85049/138-20B 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: FRICTION
•
OVERALL DIAMETER: 0.809 INCHES MINIMUM AND 0.871 INCHES MAXIMUM IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.595 INCHES MINIMUM AND 0.615 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: PLASTIC
•
INSIDE DIAMETER LENGTH: 0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER0.809 INCHES MINIMUM AND 0.871 INCHES MAXIMUM IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.595 INCHES MINIMUM AND 0.615 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-81705, TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE
MATERIALPLASTIC
INSIDE DIAMETER LENGTH0.469 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 3
AS85049/138-20RAReference document
Same NSN cross-reference
Reference document — Secondary reference
MS90376-10RFReference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS85049/138Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M85049/138-20B?
M85049/138-20B is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace M85049/138-20B?
There are 3 known substitutes for M85049/138-20B: AS85049/138-20RA, MS90376-10RF, SAE-AS85049/138. Substitute compatibility should be verified for your specific system.
What is the NSN for M85049/138-20B?
M85049/138-20B is cataloged in the U.S. Government catalog under NSN 5340-01-319-4912. 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.