604
600 Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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604 Bearing Product Overview & Core Advantages
The 604 metric ball bearing is a fundamental single row deep groove ball bearing designed for reliable performance in a wide range of applications. Engineered to primarily support radial loads, this open-type bearing offers a compact and versatile solution. Manufactured from high-grade chrome steel with an ABEC1 tolerance class, it provides a cost-effective balance of precision and durability for general industrial use. Its simple, robust design ensures consistent operation and ease of integration.
604 Bearing Model Code Explained, Specifications & Naming Convention
The model number 604 follows a standard industry nomenclature for metric bearings. The code can be broken down as follows:
- 6: Indicates a single row deep groove ball bearing series.
- 04: Specifies the bore diameter. For this series, the bore diameter is calculated as 04 x 5 = 4 mm.
- Open (No Seal/Shield Suffix): The absence of a suffix like "2Z" or "RS" indicates an open design, allowing for higher speeds and custom lubrication regimes but requiring a clean operating environment or external sealing.
604 Bearing Structural Features & Performance Benefits
The 604 bearing's performance is derived from its fundamental design and material selection:
- Deep Groove Raceway & Radial Load Capacity: The uninterrupted deep groove raceways on both inner and outer rings are optimized for handling radial loads efficiently, with a dynamic load rating of 183 lbf.
- High-Speed Capability: The open design, combined with a lightweight stainless steel cage that guides the 7 precision chrome steel balls, enables a high limiting speed of 48,000 rpm.
- Standard Internal Clearance: With a specified radial internal clearance of MC3 (0.002mm to 0.013mm), this bearing is suited for applications with typical operational fits and temperature variations.
- Material Integrity: The use of chrome steel for rings and balls ensures high hardness and wear resistance, contributing to a long service life under standard operating conditions.
604 Bearing Typical Application Areas
Due to its compact bearing dimensions (4x12x4 mm) and reliable performance, the 604 bearing is widely used in:
- Small Electric Motors (e.g., cooling fans, small power tools)
- Precision Instruments and Optical Devices
- Office Machinery (printers, scanners)
- Radio-Control Models and Small Gearboxes
- Medical Devices and Laboratory Equipment
