Overview
The Fafnir RA103-2 lock collar bearing S1103K3 is a precision insert ball bearing manufactured by Timken’s Fafnir brand. This bearing features an eccentric locking collar that provides secure, repeatable shaft positioning without external lock rings or set screws. The design is engineered for reliable operation in industrial automation, conveyor systems, and rotating machinery where quick installation and positive shaft retention are required.
Key Features
- Eccentric locking collar provides secure shaft retention and repeatable positioning
- Deep groove ball bearing design for smooth, efficient rotation
- Double sealed (contact) design protects against contamination
- Standard ABEC 1 precision for industrial applications
- Steel cage for durability in demanding environments
- Greater than normal clearance (C3) for accommodating thermal expansion and misalignment
- Drop-in replacement for equivalent RA103 series bearings
Technical Specifications
The RA103-2 insert ball bearing delivers consistent performance across industrial duty cycles:
- Bore Diameter (ID): 1.25 inches (31.75 mm)
- Outer Diameter (OD): 2.441 inches (62 mm)
- Width: 1.406 inches (18 mm)
- Bearing Type: Deep Groove Ball Bearing (Insert)
- Collar Style: Eccentric Locking Collar
- Precision Grade: ABEC 1 (Standard)
- Sealing: Double Sealed (Contact)
- Internal Clearance: C3 (Greater than normal)
- Cage Material: Steel
- Weight: Approximately 0.39 lbs (0.18 kg)
- Manufacturer: Timken Corporation (Fafnir Brand)
Typical Applications
The Fafnir RA103-2 is commonly found in industrial machinery where secure, tool-free shaft attachment is critical:
- Conveyor system rollers and pulleys
- Industrial pump and fan shafts
- Machine tool spindle supports
- Agricultural equipment rotating assemblies
- Packaging and automation equipment
- General machinery maintenance and bearing replacement programs
Compatibility & Replacements
Compatible With
- ISO 286 metric and imperial shaft sizes matching 1.25″ bore specifications
- Standard pillow block and flange housings rated for RA103 series bearings
- Industrial automation systems requiring insert ball bearing mounts
- Equipment designed for eccentric collar lock bearing installation
Replaces / Drop-In Replacement For
- Fafnir RA103-2R (with recirculating collar)
- Fafnir RA103RR2 (wide inner ring variant)
- Other equivalent 1.25″ bore deep groove insert bearings with eccentric collars
Works With
- Pillow block and flange bearing housings rated for 1.25″ shaft size
- Standard bearing puller tools and installation equipment
- Industrial lubrication systems (grease or oil compatible)
- General mechanical power transmission applications
