PartsTable
Technical Data Sheet
PartsTable / COMPONENT / RA1 3/4
RA1 3/4 ✓ 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 RA1 3/4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-01-188-4878, 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
RA1 3/4
NSN: 3130-01-188-4878
FSC: 3130
CAGE: 21335 — TIMKEN CO DIV THE TIMKEN COMPANY (USA)
SPECIFICATIONS
Part NumberRA1 3/4
NSN3130-01-188-4878
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: RA1 3/4 · 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
•
BOLT CIRCLE DIAMETER: 4.7500 INCHES NOMINAL IN
•
HOUSING LENGTH: 0.8661 INCHES NOMINAL IN
•
COLLAR LOCATION: ONE END
•
FEATURES PROVIDED: GROUND ROLLING ELEMENT GROOVE
•
SEAL LOCATION: BOTH ENDS
•
SEAL TYPE: CONTACT
•
HOUSING DIAMETER: 5.8750 INCHES NOMINAL IN
•
ROTATING ELEMENT LOCKING METHOD: ECCENTRIC CAM LOCKING COLLAR
TECHNICAL CHARACTERISTICS (FLIS)
BOLT CIRCLE DIAMETER4.7500 INCHES NOMINAL IN
HOUSING LENGTH0.8661 INCHES NOMINAL IN
COLLAR LOCATIONONE END
FEATURES PROVIDEDGROUND ROLLING ELEMENT GROOVE
SEAL LOCATIONBOTH ENDS
SEAL TYPECONTACT
HOUSING DIAMETER5.8750 INCHES NOMINAL IN
ROTATING ELEMENT LOCKING METHODECCENTRIC CAM LOCKING COLLAR
INTERNAL FIT-UP DESIGNATIONSTANDARD
BORE DIAMETER1.7500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
93320Interchangeable
interchangeable cross-reference
interchangeable
RA134Interchangeable
interchangeable cross-reference
interchangeable
827854Interchangeable
interchangeable cross-reference
interchangeable
G3639Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RA1 3/4?
RA1 3/4 is a RA1 3/4.
What parts can replace RA1 3/4?
There are 4 known substitutes for RA1 3/4: 93320, RA134, 827854 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RA1 3/4?
RA1 3/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-01-188-4878. 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