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11731-1 — SHAFT,SHOULDERED

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

11731-1: SHAFT,SHOULDERED.

The SHAFT,SHOULDERED is a the manufacturer industrial component. Key specifications include material: STEEL, end_similarity: NOT IDENTICAL, overall_length: 1.250 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES, first_end_style: PLAIN, second_end_style: EXTERNAL THREADED. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-075-6326, 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
11731-1
NSN: 3120-00-075-6326
NIINs: 000756326, 009291592, 012167363
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 21439 — CURTISS-WRIGHT FLOW CONTROL SERVICE, LLC DBA ENGINEERED ARRESTING SYSTEMS - ESCO DIV CW FLOW CONTROL SVC LLC DBA (USA)
SPECIFICATIONS
materialSTEEL
step_quantity2
end_similarityNOT IDENTICAL
overall_length1.250 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES
first_end_stylePLAIN
second_end_styleEXTERNAL THREADED
first_end_diameter0.3100 INCHES NOMINAL IN
second_end_diameter0.2500 INCHES NOMINAL IN
fsc_application_dataGEARBOX ASSEMBLY WING FLAP ACFT
largest_step_diameter0.310 INCHES NOMINAL IN
second_end_external_thread_length0.500 INCHES NOMINAL IN
NSN3120-00-075-6326
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 11731-1 · 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
•
STYLE DESIGNATOR: SEGMENTED, PLAIN, NO OUTSIDE FLANGES
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSEGMENTED, PLAIN, NO OUTSIDE FLANGES
SUBSTITUTES & CROSS-REFERENCES 1
11731-2Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 11731-1?
11731-1 is a SHAFT,SHOULDERED.
What parts can replace 11731-1?
There is 1 known substitute for 11731-1: 11731-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 11731-1?
11731-1 is cataloged in the U.S. Government catalog under NSN 3120-00-075-6326. 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.