NiArt 20 Pack Fidget Spinner Bearing & Cap Replacement Set – MR137 13x7x4mm Chrome Steel Bearings

Upgrade your fidget spinner with a versatile replacement kit

Discover a practical, all in one solution for refreshing your fidget spinner projects. The NiArt 20 pack combines precision MR137 bearings with durable caps, designed for smooth spins, reliable durability, and easy swaps. This kit is ideal for hobbyists and creators who want to refresh old frames or experiment with new feels and looks without buying parts piece by piece.

What’s inside and key specs

Inside the package you will find 20 MR137 bearings with blue seals and 20 pairs of black caps. Bearing measurements are inner diameter 7 mm, outer diameter 13 mm, and thickness 4 mm, while the caps measure about 21 mm in diameter. This pairing provides a balanced fit for many common spinner designs while keeping components tightly aligned during fast spins.

• Quality and durability The bearings combine stainless steel races with durable plastic seals for long lasting performance and resistance to deformation under regular use.
• Sealed for protection One side sealing helps keep lubrication in and contaminants out, aiding smooth operation over time.
• Smooth, high speed rolling Polished inner and outer races reduce friction for more consistent spins.
• Cap compatibility ABS caps are lightweight yet sturdy and easy to install or remove for quick upgrades.

Versatile uses for DIY spinner projects

This set is suited for a variety of spinner needs, from replacements to creative builds. Whether you are replacing lost components or experimenting with different weights and textures, these parts offer flexibility without committing to a single look or feel.

• Replacement parts for worn or missing bearings and caps
• DIY spinner customization and frame upgrades
• Compatible with a wide range of standard MR137 style designs

Easy installation tips and safety

To install, detach the old parts, clean the bearing seats, align the new MR137 bearing, and press in the cap. Test spin and reapply lubrication if needed. Safety note small parts should be kept away from children under three years old and proper supervision is advised during use.