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42540A — BEARING HALF,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

42540A: BEARING HALF,SLEEVE.

The BEARING HALF,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630, design_type: SOLID, overall_height: 0.3500 INCHES NOMINAL IN, style_designator: SEAT, surface_treatment: PASSIVATE, counterbore_length: 0.1350 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-362-9030, 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
42540A
NSN: 3120-00-362-9030
NIINs: 003629030, 010584890
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 1ML14 — BRINKLEY TECHNOLOGY GROUP LLC DBA HERCULES MANUFACTURING (USA)
SPECIFICATIONS
materialSTEEL COMP 630
design_typeSOLID
overall_height0.3500 INCHES NOMINAL IN
style_designatorSEAT
surface_treatmentPASSIVATE
counterbore_length0.1350 INCHES NOMINAL IN
first_step_diameter0.7400 INCHES MINIMUM AND 0.7600 INCHES MAXIMUM IN
counterbore_diameter0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN
distance_from_end_to_first_step0.2800 INCHES NOMINAL IN
material_document_and_classificationAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
NSN3120-00-362-9030
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 42540A · 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
•
FLANGE OUTSIDE DIAMETER: 3.5000 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 2.5156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE OUTSIDE DIAMETER3.5000 INCHES NOMINAL IN
BODY INSIDE DIAMETER2.5156 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
40555AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 42540A?
42540A is a BEARING HALF,SLEEVE.
What parts can replace 42540A?
There is 1 known substitute for 42540A: 40555A. Substitute compatibility should be verified for your specific system.
What is the NSN for 42540A?
42540A is cataloged in the U.S. Government catalog under NSN 3120-00-362-9030. 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.