FR2-5
FR Series Flanged Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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FR2-5 Bearing Product Overview & Core Advantages
The FR2-5 is a precision-engineered inch-series ball bearing designed for applications demanding high reliability in compact spaces. As a single row radial ball bearing with an open design, it excels in handling radial loads efficiently. Its construction from Chrome Steel rings and balls ensures durability and consistent performance. The bearing is characterized by its small footprint, with a bore diameter of 0.125" and an outside diameter of 0.3125", making it an ideal choice for miniature assemblies and precision instruments requiring ABEC1 tolerance class accuracy.
FR2-5 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| FR2-5 | Indicates a specific inch-series bearing with a 1/8" bore and 5/16" outer diameter. |
| Open (Seal Type) | No seals or shields, allowing for higher speeds and easy re-lubrication, but requiring a clean operating environment. |
| MC3 | Specifies a radial internal clearance group (0.00008" to 0.0005") suitable for applications with moderate operational temperatures and fits. |
| ABEC1 | Defines the precision tolerance class, ensuring runout and dimensional consistency for reliable performance in general precision applications. |
FR2-5 Bearing Structural Features & Performance Benefits
Optimized Single Row Design: The single row construction with 6 precision balls provides a compact and efficient solution for radial load support, contributing to a low friction operation.
High-Grade Materials: The use of Chrome Steel for rings and balls, combined with a Stainless Steel cage, ensures high corrosion resistance and mechanical strength, supporting a long service life.
Performance under Speed: With a limiting speed of 60,000 rpm, this bearing is capable of high-speed operation, aided by its open design which reduces drag and heat generation.
Precision Internal Clearance: The MC3 radial internal clearance is optimized to accommodate thermal expansion and fit conditions, ensuring stable operation across its specified temperature range of -86 to 230 °F.
FR2-5 Bearing Typical Application Areas
- Small Precision Motors and Spindles
- Medical and Dental Hand Tools
- Optical Encoders and Scanners
- Miniature Gearboxes and Actuators
- Office Automation Equipment (e.g., small printers, scanners)
- Instrumentation and Control Devices
