R188 ZZ 1/4″ x 1/2″ x 3/16″ Chrome Steel Miniature Deep Groove Ball Bearing

Product Overview

The R188ZZ miniature deep groove ball bearing is engineered to deliver precision performance in a compact inch-size package. With exacting dimensions of 1/4″ bore, 1/2″ outer diameter, and 3/16″ width (6.35 mm × 12.7 mm × 4.762 mm), this bearing is the preferred choice for applications where space is limited but smooth, low-friction rotation is critical.

Key Features:

• Ultra-Compact Inch-Size Footprint
  With a 1/4″ bore and just 3/16″ width, the R188ZZ fits into the tightest mechanical assemblies. Its miniature dimensions enable the miniaturization of skateboard wheels, yo-yos, RC models, and precision instruments without sacrificing performance.

• High Speed
  Up to 40,000 RPM – The R188ZZ is engineered for high-speed operation, with a grease-lubricated limiting speed of 40,000 RPM. This speed capability makes it ideal for yo-yos, RC motors, and other applications where rotational velocity is critical to performance.

• Low Friction, Low Noise, Smooth Operation
  Precision grinding of raceways and balls results in a very low coefficient of friction, reducing power consumption, heat generation, and audible noise. The R188ZZ delivers quiet, smooth rotation that enhances user experience in yo-yos, skateboards, and precision instruments.
• Versatile Load Handling
  Radial and Moderate Axial Loads – As a deep groove ball bearing, the R188ZZ is designed to handle radial loads as its primary duty while also accommodating moderate axial (thrust) loads in both directions. This versatility reduces the number of bearings required in an assembly and simplifies mechanical design.
• Lightweight Design
  Weighing just 2.24 grams, the R188ZZ adds minimal mass to moving assemblies, reducing inertia and enabling faster acceleration and deceleration.

Applications

The R188ZZ miniature deep groove ball bearing is a versatile component found across numerous industries and applications:

• Skateboards and Longboards

• Inline Skates and Rollerblades

• Yo-Yos
• Remote Control (RC) Models
• 3D Printers and Desktop CNC Machines
• Precision Instruments and Medical Devices
• Small Electric Motors and Micro Gearboxes
• Hobby Robotics and DIY Projects