NiArt 16 Pack Fidget Spinner Bearing & Cap Replacement Set — MR137 High-Speed 13x7x4mm Chrome Steel Bearings

Overview

NiArt presents the 16 Pack Fidget Spinner Bearing and Cap Replacement Set, a thoughtfully designed kit for DIY spin enthusiasts. This bundle brings together 16 MR137 precision high-speed bearings with blue plastic seals and 16 pairs of black caps, all sized for reliable compatibility. The bearings measure approximately 7 mm inner diameter, 13 mm outer diameter, and 4 mm thick, making them suitable for a range of spinner builds and replacements.

Quality from inside out: the MR137 bearings are crafted from stainless steel for durability and corrosion resistance, with machine-polished inner and outer races that ensure smooth, high-speed rolling. The one-side seal on each bearing helps keep lubricants in and contaminants out, supporting longer life and steadier spins in everyday use.

The caps, made from ABS plastic, are lightweight yet sturdy. They snap into place with ease, making installation and removal straightforward for both fresh builds and lost-component replacements. This set is designed for versatility—use it to replace worn parts, refresh an old spinner, or craft a unique new design.

What’s in the box

• 16 MR137 precision high-speed bearings with blue seals (13x7x4 mm)
• 16 pairs of black bearing caps (approx. 2.1 cm diameter)

Key Benefits

• Enhanced speed and precision: polished races and high-quality stainless steel support smooth, fast rotations.
• Durability and longevity: corrosion-resistant materials stand up to regular use and environmental exposure.
• Protection against contaminants: one-side seals help reduce dust and moisture entry while preserving lubrication.
• Versatile compatibility: designed to fit MR137 bearings, suitable for a wide variety of spinner builds and DIY projects.
• Easy installation and maintenance: lightweight ABS caps are simple to install and remove without fuss.

Real-world scenarios often involve creative projects, replacements after part loss, or performance-focused DIY builds. Users report a satisfying balance of feel and speed, whether spinning solo, performing tricks, or integrating the parts into a custom spinner frame. The combination of a compact 13x7x4 mm bearing with a durable black cap provides a neat, stable core that can be swapped in and out with minimal tools.

Quality & Safety

• Manufactured to rigorous QC standards with extensive testing to ensure consistency in size and finish.
• Safety note: small parts. Not for children under 3 years. Adult supervision recommended for younger users during assembly.

With NiArt, focus remains on practical benefits that users can enjoy: smoother spins, cleaner lines, and the freedom to customize or repair without committing to a full replacement. While results vary with your spinner design and technique, this replacement set offers reliable components that can help you explore new possibilities in your fidget projects.