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Technical Data Sheet
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AA309 ✓ 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 PANEL,POWER DISTRIBUTION is a the manufacturer power supply unit built for continuous operation in enterprise server and storage platforms. Key specifications include material: OIL LUBRICATING LUBRICATION, corner_shape: SQUARE ALL CORNERS, overall_length: 0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, body_outside_diameter: 0.3135 INCHES MINIMUM AND 0.3145 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-662-8256, 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
AA309
NSN: 3120-00-662-8256
FSC: 3120
CAGE: 12204 — CHRYSLER REALTY COMPANY LLC DBA DAIMLER CHRYSLER (USA)
SPECIFICATIONS
materialOIL LUBRICATING LUBRICATION
corner_shapeSQUARE ALL CORNERS
overall_length0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
body_outside_diameter0.3135 INCHES MINIMUM AND 0.3145 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND A COMPOSITION
material_document_and_classificationMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN3120-00-662-8256
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: AA309 · 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
•
MATERIAL: COPPER ALLOY OVERALL
•
CORNER SHAPE: SQUARE ALL CORNERS
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY OUTSIDE DIAMETER: 0.3135 INCHES MINIMUM AND 0.3145 INCHES MAXIMUM IN
•
BODY INSIDE DIAMETER: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
TYPICAL APPLICATIONS
  • Server power supply replacement (failed or degraded)
  • Redundant power upgrade for high-availability
  • Power capacity upgrade for GPU or expansion configurations
  • Hot-swap power maintenance in production environments
  • Spare inventory for break-fix operations
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
MATERIALOIL LUBRICATING LUBRICATION
CORNER SHAPESQUARE ALL CORNERS
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY OUTSIDE DIAMETER0.3135 INCHES MINIMUM AND 0.3145 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
OVERALL LENGTH0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND A COMPOSITION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
A30-9Interchangeable
interchangeable cross-reference
interchangeable
131-309-3Interchangeable
interchangeable cross-reference
interchangeable
ST293Interchangeable
interchangeable cross-reference
interchangeable
723298-5Interchangeable
interchangeable cross-reference
interchangeable
723298-005Interchangeable
interchangeable cross-reference
interchangeable
MILB5687TYPE1C0MP0SITI0NAInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AA309?
AA309 is a PANEL,POWER DISTRIBUTION.
What parts can replace AA309?
There are 7 known substitutes for AA309: A30-9, 131-309-3, ST293 and 4 more. Substitute compatibility should be verified for your specific system.
Is AA309 still available?
AA309 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