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Technical Data Sheet
PartsTable / O-RING / AMS-R-6855A
AMS-R-6855A ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The TUBING,NONMETALLIC is a the manufacturer industrial component. Key specifications include length: 20.000 INCHES NOMINAL IN, material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR LOCATION NOT OTHERWISE SPECIFIED, surface_condition: SMOOTH BOTH SIDES, cross-sectional_shape_style: CIRCULAR, nonmetallic_hardness_rating: 70.0 NOMINAL SHORE DUROMETER A, cross_section_outside_diameter: 0.375 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-119-1643, 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
AMS-R-6855A
NSN: 5331-00-119-1643
FSC: 5331 — O-RING
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
length20.000 INCHES NOMINAL IN
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR LOCATION NOT OTHERWISE SPECIFIED
surface_conditionSMOOTH BOTH SIDES
cross-sectional_shape_styleCIRCULAR
nonmetallic_hardness_rating70.0 NOMINAL SHORE DUROMETER A
cross_section_outside_diameter0.375 INCHES NOMINAL IN
material_document_and_classificationMIL-R-6855, CLASS 1, GRADE 70 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED
NSN5331-00-119-1643
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AMS-R-6855A 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
•
MATERIAL: RUBBER CHLOROPRENE CLASS CR
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 0.203 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.348 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER CHLOROPRENE CLASS CR
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
CENTER HOLE DIAMETER0.203 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.348 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
545781Interchangeable
interchangeable cross-reference
interchangeable
AMS7273Interchangeable
interchangeable cross-reference
interchangeable
AMS-R-6855AInterchangeable
interchangeable cross-reference
interchangeable
MIL-R-6855Interchangeable
interchangeable cross-reference
interchangeable
M6855/4-08L289Interchangeable
interchangeable cross-reference
interchangeable
P5021-1-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AMS-R-6855A?
AMS-R-6855A is a TUBING,NONMETALLIC.
What parts can replace AMS-R-6855A?
There are 30 known substitutes for AMS-R-6855A: 545781, AMS7273, AMS-R-6855A and 27 more. Substitute compatibility should be verified for your specific system.
Is AMS-R-6855A still available?
AMS-R-6855A is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026