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Technical Data Sheet
PartsTable / COMPONENT / MIL-B-81820
MIL-B-81820 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 INNER MEMBER, bore_diameter: 0.9995 INCHES MINIMUM AND 1.0000 INCHES MAXIMUM IN, style_designator: WITH INSERT AND/OR LINER, surface_treatment: PASSIVATE INNER MEMBER, inner_member_width: 0.4350 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN, outer_member_width: 0.3380 INCHES MINIMUM AND 0.3480 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-332-4378, 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
MIL-B-81820
NSN: 3120-00-332-4378
FSC: 3120
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP XM-13 INNER MEMBER
bore_diameter0.9995 INCHES MINIMUM AND 1.0000 INCHES MAXIMUM IN
style_designatorWITH INSERT AND/OR LINER
surface_treatmentPASSIVATE INNER MEMBER
inner_member_width0.4350 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
outer_member_width0.3380 INCHES MINIMUM AND 0.3480 INCHES MAXIMUM IN
outer_member_outside_diameter0.9057 INCHES MINIMUM AND 0.9062 INCHES MAXIMUM IN
material_document_and_classificationAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OUTER RACE MEMBER
NSN3120-00-332-4378
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: MIL-B-81820 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HARDNESS RATING: 55.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM INNER MEMBER
•
STYLE DESIGNATOR: WITH INSERT AND/OR LINER
•
MATERIAL: STEEL COMP 630 OUTER RACE MEMBER
•
OUTER MEMBER OUTSIDE DIAMETER: 1.6245 INCHES MINIMUM AND 1.6250 INCHES MAXIMUM IN
•
INNER MEMBER WIDTH: 0.8730 INCHES MINIMUM AND 0.8750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING55.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM INNER MEMBER
STYLE DESIGNATORWITH INSERT AND/OR LINER
MATERIALSTEEL COMP 630 OUTER RACE MEMBER
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE RACE LINER
MATERIALSTEEL COMP 440C INNER MEMBER
OUTER MEMBER OUTSIDE DIAMETER1.6245 INCHES MINIMUM AND 1.6250 INCHES MAXIMUM IN
INNER MEMBER WIDTH0.8730 INCHES MINIMUM AND 0.8750 INCHES MAXIMUM IN
BORE DIAMETER0.8745 INCHES MINIMUM AND 0.8750 INCHES MAXIMUM IN
OUTER MEMBER WIDTH0.7500 INCHES MINIMUM AND 0.7600 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
AS14104Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS81820Interchangeable
interchangeable cross-reference
interchangeable
MIL-B-81820Interchangeable
interchangeable cross-reference
interchangeable
AS81820Interchangeable
interchangeable cross-reference
interchangeable
AS14104-7CInterchangeable
interchangeable cross-reference
interchangeable
MS14103-14Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-B-81820?
MIL-B-81820 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace MIL-B-81820?
There are 9 known substitutes for MIL-B-81820: AS14104, SAE-AS81820, MIL-B-81820 and 6 more. Substitute compatibility should be verified for your specific system.
Is MIL-B-81820 still available?
MIL-B-81820 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