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TB612 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BEARING,WASHER,THRUST is a the manufacturer industrial component. Key specifications include diameter: 0.3750 INCHES NOMINAL IN, material: STEEL BODY, corner_shape: SQUARE ALL CORNERS, outside_diameter: 0.7500 INCHES NOMINAL IN, style_designator: ROUND, overall_thickness: 0.0312 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-421-4781, 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
TB612
NSN: 3120-00-421-4781
FSC: 3120
CAGE: 71041 — ALTRA INDUSTRIAL MOTION CORP. (USA)
SPECIFICATIONS
diameter0.3750 INCHES NOMINAL IN
materialSTEEL BODY
corner_shapeSQUARE ALL CORNERS
outside_diameter0.7500 INCHES NOMINAL IN
style_designatorROUND
overall_thickness0.0312 INCHES NOMINAL IN
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_data1 TYPE AND A COMPOSITION
criticality_code_justificationZZZY
material_document_and_classificationMIL-L-15016 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
reference_number_differentiating_characteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
NSN3120-00-421-4781
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: TB612 · 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
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
•
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
CRITICALITY CODE JUSTIFICATIONZZZY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
TT703Interchangeable
interchangeable cross-reference
interchangeable
65C35442-9Interchangeable
interchangeable cross-reference
interchangeable
00004-ST111Interchangeable
interchangeable cross-reference
interchangeable
F-254-BInterchangeable
interchangeable cross-reference
interchangeable
F254B-PIECE60Interchangeable
interchangeable cross-reference
interchangeable
TB612Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is TB612?
TB612 is a BEARING,WASHER,THRUST.
What parts can replace TB612?
There are 9 known substitutes for TB612: TT703, 65C35442-9, 00004-ST111 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for TB612?
TB612 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-421-4781. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026