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181DS21 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

181DS21: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include length: 0.174 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN, insert_size: 0.112 IN. NOM DIA IN, thread_class: 2B, flange_diameter: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN, flange_thickness: 0.021 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN, style_designator: FLANGE.

This part is cataloged in the U.S. Government catalog under NSN 3130-01-252-8433, 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
181DS21
NSN: 3130-01-252-8433
FSC: 3130 — Bearings, Mounted
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
length0.174 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
insert_size0.112 IN. NOM DIA IN
thread_class2B
flange_diameter0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
flange_thickness0.021 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
style_designatorFLANGE
surface_treatmentANODIZE OVERALL
nominal_thread_size0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN3130-01-252-8433
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 181DS21 · 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
SUBSTITUTES & CROSS-REFERENCES 3
210661XReference document
Same NSN cross-reference
Reference document — Secondary reference
210661-1XReference document
Same NSN cross-reference
Reference document — Secondary reference
5003323Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 181DS21?
181DS21 is a BEARING UNIT,BALL.
What parts can replace 181DS21?
There are 3 known substitutes for 181DS21: 210661X, 210661-1X, 5003323. Substitute compatibility should be verified for your specific system.
What is the NSN for 181DS21?
181DS21 is cataloged in the U.S. Government catalog under NSN 3130-01-252-8433. 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.