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112109 — PISTON,INTERNAL COMBUSTION ENGIN

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

112109: PISTON,INTERNAL COMBUSTION ENGIN.

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include diameter: 3.250 INCHES NOMINAL IN, cut_depth: 1.000 INCHES NOMINAL IN, head_style: FLAT, oil_groove: NOT INCLUDED, skirt_type: SOLID, carbon_groove: NOT INCLUDED. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-184-9924, 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
112109
NSN: 3120-00-184-9924
NIINs: 001849924, 009968036, 012486728
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 11599 — TRIUMPH ENGINE CONTROL SYSTEMS LLC (USA)
SPECIFICATIONS
diameter3.250 INCHES NOMINAL IN
cut_depth1.000 INCHES NOMINAL IN
head_styleFLAT
oil_grooveNOT INCLUDED
skirt_typeSOLID
carbon_grooveNOT INCLUDED
overall_height3.875 INCHES NOMINAL IN
surface_finishFINISHED
oil_passage_typeHOLE THIRD RING
pin_hole_bushingNOT INCLUDED
pinhole_diameter0.9900 INCHES MINIMUM AND 0.9902 INCHES MAXIMUM IN
ring_groove_width0.0970 INCHES MINIMUM AND 0.0980 INCHES MAXIMUM FIRST RING IN
NSN3120-00-184-9924
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 112109 · 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
•
BODY OUTSIDE DIAMETER: 0.8800 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 0.6908 INCHES MINIMUM AND 0.6913 INCHES MAXIMUM IN
•
LEFT FLANGE OUTSIDE DIAMETER: 1.4988 INCHES MINIMUM AND 1.4991 INCHES MAXIMUM IN
•
LEFT FLANGE WIDTH: 0.2995 INCHES MINIMUM AND 0.3005 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
BODY OUTSIDE DIAMETER0.8800 INCHES NOMINAL IN
OVERALL LENGTH1.4300 INCHES MINIMUM AND 1.4400 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.6908 INCHES MINIMUM AND 0.6913 INCHES MAXIMUM IN
LEFT FLANGE OUTSIDE DIAMETER1.4988 INCHES MINIMUM AND 1.4991 INCHES MAXIMUM IN
LEFT FLANGE WIDTH0.2995 INCHES MINIMUM AND 0.3005 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
97766Reference 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 112109?
112109 is a PISTON,INTERNAL COMBUSTION ENGIN.
What parts can replace 112109?
There is 1 known substitute for 112109: 97766. Substitute compatibility should be verified for your specific system.
What is the NSN for 112109?
112109 is cataloged in the U.S. Government catalog under NSN 3120-00-184-9924. 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.