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A51B18501-11 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

A51B18501-11: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include block_type: FIXED, base_length: 0.500 INCHES NOMINAL IN, bore_diameter: 0.2560 INCHES MINIMUM AND 0.2630 INCHES MAXIMUM IN, housing_width: 1.750 INCHES NOMINAL IN, alignment_type: RIGID, base_thickness: 0.230 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-247-6942, 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
A51B18501-11
NSN: 3130-01-247-6942
FSC: 3130 — Bearings, Mounted
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
block_typeFIXED
base_length0.500 INCHES NOMINAL IN
bore_diameter0.2560 INCHES MINIMUM AND 0.2630 INCHES MAXIMUM IN
housing_width1.750 INCHES NOMINAL IN
alignment_typeRIGID
base_thickness0.230 INCHES NOMINAL IN
surface_treatmentPLASTIC EPOXY AND PLASTIC POLYAMIDE OVERALL
mounting_hole_typeROUND, UNTHREADED
mounting_hole_diameter0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN
surface_treatment_document_and_classificationMIL-P-23377 MIL SPEC SINGLE TREATMENT RESPONSE OR GSS4310,CAGEC 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
center_to_center_distance_between_mounting_holes_along_width1.250 INCHES NOMINAL IN
NSN3130-01-247-6942
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: A51B18501-11 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-P-23377 MIL SPEC SINGLE TREATMENT RESPONSE OR GSS4310,CAGEC 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
BLOCK TYPE: FIXED
•
MOUNTING HOLE DIAMETER: 0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH: 1.250 INCHES NOMINAL IN
•
HOUSING WIDTH: 1.750 INCHES NOMINAL IN
•
BASE LENGTH: 0.500 INCHES NOMINAL IN
•
ALIGNMENT TYPE: RIGID
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-23377 MIL SPEC SINGLE TREATMENT RESPONSE OR GSS4310,CAGEC 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
MOUNTING HOLE TYPEROUND, UNTHREADED
BLOCK TYPEFIXED
MOUNTING HOLE DIAMETER0.097 INCHES MINIMUM AND 0.102 INCHES MAXIMUM IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH1.250 INCHES NOMINAL IN
HOUSING WIDTH1.750 INCHES NOMINAL IN
BASE LENGTH0.500 INCHES NOMINAL IN
ALIGNMENT TYPERIGID
SURFACE TREATMENTPLASTIC EPOXY AND PLASTIC POLYAMIDE OVERALL
BASE THICKNESS0.230 INCHES NOMINAL IN
OTHER ITEMS IN FSC 3130 — Bearings, Mounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3130-00-001-5118 3130-00-001-5137 3130-00-001-6585 3130-00-003-0422 3130-00-003-0455 3130-00-003-0794 3130-00-003-2802 3130-00-003-9535
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 A51B18501-11?
A51B18501-11 is a BEARING UNIT,BALL.
What is the NSN for A51B18501-11?
A51B18501-11 is cataloged in the U.S. Government catalog under NSN 3130-01-247-6942. 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.