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A8657 — A8657

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

A8657: A8657.

The A8657 is a the manufacturer industrial component. Key specifications include material: STEEL, special_features: RADIO AND TELEVISION COMMUNICATION EQUIPMENT,EXCEPT AIRBORNE. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-661-9438, 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
MRO→ MRO_GENERAL→ A8657
NSN: 3120-00-661-9438
NIINs: 006619438, 011753150
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 70417 — CHRYSLER CORP AMPLEX DIV (USA)
SPECIFICATIONS
materialSTEEL
special_featuresRADIO AND TELEVISION COMMUNICATION EQUIPMENT,EXCEPT AIRBORNE
NSN3120-00-661-9438
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: A8657 · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 0.8140 INCHES MINIMUM AND 0.8150 INCHES MAXIMUM IN
•
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 INSIDE DIAMETER: 0.6265 INCHES MINIMUM AND 0.6275 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER0.8140 INCHES MINIMUM AND 0.8150 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH0.4325 INCHES MINIMUM AND 0.4425 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.6265 INCHES MINIMUM AND 0.6275 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY OVERALL
MATERIALOIL LUBRICATING LUBRICATION
SUBSTITUTES & CROSS-REFERENCES 1
12Z10003-145Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A8657?
A8657 is a A8657. It is classified as a MRO (MRO_GENERAL).
What parts can replace A8657?
There is 1 known substitute for A8657: 12Z10003-145. Substitute compatibility should be verified for your specific system.
What is the NSN for A8657?
A8657 is cataloged in the U.S. Government catalog under NSN 3120-00-661-9438. 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.