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645977 — PLATE,COMBUSTION CH

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

645977: PLATE,COMBUSTION CH.

The PLATE,COMBUSTION CH is a the manufacturer industrial component. Key specifications include part_name_assigned_by_controlling_agency: PLATE-COMBUSTION CHAMBER DUCT BAFFLE. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-001-7792, 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
645977
NSN: 3120-00-001-7792
NIINs: 000017792, 001682855
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 45681 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV CORPORATE HEADQUARTERS (USA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyPLATE-COMBUSTION CHAMBER DUCT BAFFLE
NSN3120-00-001-7792
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 645977 · 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: 0.6250 INCHES NOMINAL IN
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STYLE DESIGNATOR: SPLIT, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 0.5000 INCHES NOMINAL IN
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ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 4 HOLE
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.2813 INCHES NOMINAL FIRST IN
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER0.6250 INCHES NOMINAL IN
STYLE DESIGNATORSPLIT, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.0000 INCHES NOMINAL IN
BODY INSIDE DIAMETER0.5000 INCHES NOMINAL IN
ANTIROTATION/LUBRICATION TYPE AND QUANTITY4 HOLE
MATERIALSTEEL OVERALL
HOLE DIAMETER0.2813 INCHES NOMINAL FIRST IN
SUBSTITUTES & CROSS-REFERENCES 1
1653-645977Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 645977?
645977 is a PLATE,COMBUSTION CH.
What parts can replace 645977?
There is 1 known substitute for 645977: 1653-645977. Substitute compatibility should be verified for your specific system.
What is the NSN for 645977?
645977 is cataloged in the U.S. Government catalog under NSN 3120-00-001-7792. 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.