MR137ZZ miniature ball bearings — 7 x 13 x 4 mm, shielded (ZZ), pack of 10 Key benefits Compact drop-in replacement for tight spaces: 7 x 13 x 4 mm size fits small housings and shafts where larger bearings cannot. Shielded design (ZZ) protects against dust and debris, helping maintain smooth operation and reducing cleaning and maintenance frequency. Precision-grade tolerance delivers reliable, low-friction rotation for smoother motion, less noise, and improved component life in compact assemblies. Pack of 10 provides convenient replacement stock for repairs, upgrades, or ongoing maintenance without repeated ordering. What this bearing does for you Restores or improves rotational accuracy in micro DC motors, small gearboxes, and precision linkages. Reduces friction and wear in constrained assemblies, helping devices run cooler and with steadier performance. Saves time during repairs: these are direct-fit replacements designed for quick installation in tight spaces. Important attributes Model: MR137ZZ Size: 7 x 13 x 4 mm (inner diameter x outer diameter x width) Shielding: ZZ (metal shields both sides) for dust protection while maintaining low friction Pack quantity: 10 bearings Construction: precision-grade, durable build for reliable operation in small mechanisms Compatibility and common applications Micro DC motors and small hobby motors Small gearboxes and transmission stages 3D printer X/Y/Z axes, idlers, and linear motion components Compact camera gimbals, stabilizers, and precision robotics joints Use scenarios Repair a micro DC motor in an RC vehicle: swap worn bearings with MR137ZZ to restore smooth, low-noise operation without modifying the motor housing. Upgrade a 3D printer axis: replace generic bushings with these precision bearings to reduce backlash and improve print quality in tight carriage assemblies. Service a compact camera gimbal or small robot joint: install MR137ZZ bearings to maintain steady rotation and extend service intervals in compact, sealed assemblies. What to expect A precision, shielded bearing that fits small shafts and housings, minimizes downtime with a 10-piece pack, and helps maintain reliable low-friction performance in compact devices.