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1B7439 — VALVE,REGULATING,FLUID PRESSURE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

1B7439: VALVE,REGULATING,FLUID PRESSURE.

VALVE,REGULATING,FLUID PRESSURE. Key specifications include end_item_identification: C-17 AIRCRAFT, reference_number_differentiating_characteristics: AS DIFFERENTIATED BY PART NUMBER. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-354-1709, 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
1B7439
NSN: 3120-00-354-1709
NIINs: 003541709, 014370444
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
end_item_identificationC-17 AIRCRAFT
reference_number_differentiating_characteristicsAS DIFFERENTIATED BY PART NUMBER
NSN3120-00-354-1709
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 1B7439 · 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: 2.1885 INCHES MINIMUM AND 2.1895 INCHES MAXIMUM IN
•
BODY INSIDE DIAMETER: 1.4800 INCHES MINIMUM AND 1.4900 INCHES MAXIMUM IN
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 1 HOLE AND 1 SLOT
•
MATERIAL: STEEL OUTER LAYER
•
SLOT WIDTH: 0.5000 INCHES NOMINAL FIRST IN
•
SLOT LENGTH: 0.7500 INCHES NOMINAL FIRST IN
•
HOLE DIAMETER: 0.2500 INCHES NOMINAL FIRST IN
TECHNICAL CHARACTERISTICS
BODY OUTSIDE DIAMETER2.1885 INCHES MINIMUM AND 2.1895 INCHES MAXIMUM IN
OVERALL LENGTH3.3125 INCHES NOMINAL IN
BODY INSIDE DIAMETER1.4800 INCHES MINIMUM AND 1.4900 INCHES MAXIMUM IN
ANTIROTATION/LUBRICATION TYPE AND QUANTITY1 HOLE AND 1 SLOT
MATERIALSTEEL OUTER LAYER
SLOT WIDTH0.5000 INCHES NOMINAL FIRST IN
SLOT LENGTH0.7500 INCHES NOMINAL FIRST IN
HOLE DIAMETER0.2500 INCHES NOMINAL FIRST IN
SUBSTITUTES & CROSS-REFERENCES 7
17077AReference document
Same NSN cross-reference
Reference document — Secondary reference
427322Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
BB1016Reference document
Same NSN cross-reference
Reference document — Secondary reference
215291Reference document
Same NSN cross-reference
Reference document — Secondary reference
7086715Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
67069AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1B7439?
1B7439 is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace 1B7439?
There are 7 known substitutes for 1B7439: 17077A, 427322, BB1016 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1B7439?
1B7439 is cataloged in the U.S. Government catalog under NSN 3120-00-354-1709. This indicates validated use in U.S. government and defense supply chains.
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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.