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Technical Data Sheet
PartsTable / COMPONENT / 3127RA-8
3127RA-8 ✓ 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 RETAINER,PACKING is a the manufacturer industrial component. Key specifications include angle: 25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM, material: PLASTIC TETRAFLUOROETHYLENE OVERALL, joint_type: SCARF-BUTT RETAINER, peripheral_diameter: 2.493 INCHES MINIMUM AND 2.497 INCHES MAXIMUM IN, center_hole_diameter: 2.125 INCHES NOMINAL IN, distance_between_ends: 0.062 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-171-6770, 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
3127RA-8
NSN: 5330-00-171-6770
FSC: 5330
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
angle25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM
materialPLASTIC TETRAFLUOROETHYLENE OVERALL
joint_typeSCARF-BUTT RETAINER
peripheral_diameter2.493 INCHES MINIMUM AND 2.497 INCHES MAXIMUM IN
center_hole_diameter2.125 INCHES NOMINAL IN
distance_between_ends0.062 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
cross-sectional_height0.093 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
cross-sectional_thickness0.031 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE
material_document_and_classificationMIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-171-6770
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3127RA-8 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 THICKNESS: 0.031 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
PERIPHERAL DIAMETER: 2.493 INCHES MINIMUM AND 2.497 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL HEIGHT: 0.093 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 2.125 INCHES NOMINAL IN
•
MATERIAL: PLASTIC TETRAFLUOROETHYLENE OVERALL
•
JOINT TYPE: SCARF-BUTT RETAINER
•
CROSS-SECTIONAL SHAPE STYLE: SQUARE
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL THICKNESS0.031 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
PERIPHERAL DIAMETER2.493 INCHES MINIMUM AND 2.497 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT0.093 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
CENTER HOLE DIAMETER2.125 INCHES NOMINAL IN
MATERIALPLASTIC TETRAFLUOROETHYLENE OVERALL
JOINT TYPESCARF-BUTT RETAINER
CROSS-SECTIONAL SHAPE STYLESQUARE
DISTANCE BETWEEN ENDS0.062 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
ANGLE25.0 DEGREES MINIMUM AND 35.0 DEGREES MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MRG38-3326-054Interchangeable
interchangeable cross-reference
interchangeable
203189Interchangeable
interchangeable cross-reference
interchangeable
0637369-0Interchangeable
interchangeable cross-reference
interchangeable
MS35803-224Interchangeable
interchangeable cross-reference
interchangeable
9763-201X8PC49Interchangeable
interchangeable cross-reference
interchangeable
BAIR HUGGER MD 505Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3127RA-8?
3127RA-8 is a RETAINER,PACKING.
What parts can replace 3127RA-8?
There are 15 known substitutes for 3127RA-8: MRG38-3326-054, 203189, 0637369-0 and 12 more. Substitute compatibility should be verified for your specific system.
Is 3127RA-8 still available?
3127RA-8 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026