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3A2166 — RING,PISTON

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

3A2166: RING,PISTON.

The RING,PISTON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, ring_style: CONCENTRIC, joint_style: VERTICAL JOINT, overall_width: 0.2500 INCHES NOMINAL IN, radial_wall_thickness: 0.3125 INCHES NOMINAL IN, standard_bore_diameter: 9.000 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 2815-00-377-2810, 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
3A2166
NSN: 2815-00-377-2810
FSC: 2815 — Diesel Engines and Components
CAGE: 14541 — COOPER MACHINERY SERVICES LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
ring_styleCONCENTRIC
joint_styleVERTICAL JOINT
overall_width0.2500 INCHES NOMINAL IN
radial_wall_thickness0.3125 INCHES NOMINAL IN
standard_bore_diameter9.000 INCHES IN
cross-sectional_shape_styleTAPERED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL
oil_passage_type_and_quantity10 SLOT VERTICALLY THROUGH RING
NSN2815-00-377-2810
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING,PISTON TITLE COMPONENT PN 3A2166 MFR RING,PISTON
KEY FEATURES
•
CROSS-SECTIONAL SHAPE STYLE: TAPERED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL
•
JOINT STYLE: VERTICAL JOINT
•
OIL PASSAGE TYPE AND QUANTITY: 1 GROOVE OUTSIDE PERIPHERY
•
RADIAL WALL THICKNESS: 0.3125 INCHES NOMINAL IN
•
RING STYLE: CONCENTRIC
•
STANDARD BORE DIAMETER: 9.000 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL WIDTH0.2500 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLETAPERED FACE, DOUBLE SCRAPER, VENTILATED OIL CONTROL
JOINT STYLEVERTICAL JOINT
OIL PASSAGE TYPE AND QUANTITY1 GROOVE OUTSIDE PERIPHERY
OIL PASSAGE TYPE AND QUANTITY10 SLOT VERTICALLY THROUGH RING
RADIAL WALL THICKNESS0.3125 INCHES NOMINAL IN
RING STYLECONCENTRIC
STANDARD BORE DIAMETER9.000 INCHES IN
MATERIALSTEEL OVERALL
OTHER ITEMS IN FSC 2815 — Diesel Engines and Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2815-00-011-9099 2815-00-017-1875 2815-00-024-4185 2815-00-033-1482 2815-00-036-5350 2815-00-179-7630 2815-00-346-4639 2815-00-592-5308
SUBSTITUTES & CROSS-REFERENCES 1
3A21666Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 3A2166?
3A2166 is a RING,PISTON.
What parts can replace 3A2166?
There is 1 known substitute for 3A2166: 3A21666. Substitute compatibility should be verified for your specific system.
What is the NSN for 3A2166?
3A2166 is cataloged in the U.S. Government catalog under NSN 2815-00-377-2810. 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.