[Exact R188 Miniature Dimensions] Standard R188-ZZ inch size bearing. Inner Diameter: 1/4" (6.35mm), Outer Diameter: 1/2" (12.7mm), Width: 3/16" (4.76mm). Precision-engineered to be a perfect drop-in replacement for your favorite hobbies and miniature devices
THE ULTIMATE SPINNER & YOYO UPGRADE: Specially optimized for high-performance hobbies. The go-to replacement bearing for premium fidget spinners, unresponsive yo-yos, and custom EDC toys. Experience drastically increased spin times and a buttery-smooth feel
DOUBLE METAL SHIELDED FOR LOW FRICTION: Equipped with non-contact dual metal shields (ZZ) to keep lint and pocket dust out while offering significantly lower drag than rubber-sealed bearings. This allows for maximum RPMs and unrestrained freewheeling
HIGH SPEED & ULTRA-QUIET: Forged from premium Chrome Steel (ABEC-5) rather than cheap carbon steel. The deep-groove raceways and precision balls minimize annoying vibrations and grinding noises, ensuring a quiet, satisfying spin
VERSATILE MICRO PRECISION: Beyond toys, this highly precise 1/4-inch bore miniature bearing is widely used in sensitive medical instruments, robotics, small motors, and custom mechanical assemblies that require ultra-low friction in a compact space
Description
Part Number R188zz
Characteristics
System of Measurement Inch
Bearing Type Ball
For Load Direction Radial
Construction Single Row
Inner Ring Type Standard
Seal Type Shielded
Tolerance Class ABEC1
Radial Clearance Trade No MC3
Radial Clearance 0.0002" to 0.00039"
Ball Qty 8
Dimensions
Bore Dia 0.25"
Bore Dia Tolerance -0.0003" to 0"
Outer Dia 0.5"
Outer Dia Tolerance -0.0003" to 0"
Width 0.187500"
Width Tolerance -0.005" to 0"
Ball Dia 0.078700"
Material
Ring Material Chrome Steel
Ball Material Chrome Steel
Cage Material Stainless Steel
Shield Material 300 Series Stainless Steel
Performance
Dynamic Radial Load 207 lbf
Static Radial Load 80 lbf
Max Speed (X1000 rpm) 40
Temperature Range -86 to 230 °F
Properties
Lubrication Required
RoHS Compliant
REACH Compliant
Weight 2.32 g
