When shopping for fidget spinner bearing caps, look for complete replacement kits that include both bearings and caps, durable materials, and sizes that fit standard spinner designs. This guide highlights five strong options ideal for hobbyists, resin crafters, and daily stress-relief users who want reliable, smooth spins and simple maintenance. The focus is on kits with MR137 13x7x4mm bearings and compatible cap pairs, plus accessory sets designed to enhance DIY spinner projects.
Buyer overview table (quick compare)
| Product | Best For | Cap & Bearing Pair | Notes |
|---|---|---|---|
| NiArt Fidget Spinner Toy DIY Bearing with Caps Set 24-Pack | DIYers needing lots of caps and bearings | 24 pairs caps, MR137 bearings | Chrome steel, sealed one side; good for resin projects |
| 20 Pack Fidget Spinner Bearing and Cap Replacement Set | Frequent replacements, classrooms, clubs | 20 pairs caps, MR137 bearings | High-speed, durable; single-sealed |
| NiArt Fidget Spinner Toy DIY Cap Bearings Set 24-Pack (Clear Caps) | Clear-cap aesthetics for resin work | 24 pairs clear caps, MR137 bearings | Transparent snaps complement epoxy resin spinners |
| NiArt Fidget Spinner Toy DIY Bearing with Caps Set 22-Pack | Balanced selection for mid-size projects | 22 pairs caps, MR137 bearings | Similar spec to 24-pack with slight size variation |
| NBEADS 60 Sets Fidget Spinner Bearing Caps | Bulk projects, schools, long-term use | 60 sets of caps; compatible bearing cores | Plastic caps with carbon steel bearings; large quantity |
NiArt 24-Pack Bearing with Caps Set (MR137)
Best for DIY resin spinners and hobbyists who need a large supply. This kit includes 24 MR137 high-speed ball bearings with blue seals and 24 pairs of black caps. Inner diameter measures 5mm for the bearing, with an outer diameter of 13mm and 4mm thickness. Sealed on one side to resist dust and water ingress, helping maintain lubrication and smooth rotation. The combination supports both radial and axial loads, making it versatile for different spinner designs. Caution: the 5mm inner diameter differs from some standard 7mm configurations, so verify compatibility with your current spinner core.
NiArt 20 Pack Bearing and Cap Replacement Set
Better for regular replacement needs or groups that rotate spinners in classrooms. Includes 20 MR137 bearings with blue seals and 20 pairs of black caps. The bearings measure 7mm inner diameter, 13mm outer diameter, and 4mm thickness. This set emphasizes durability and smooth rolling, with corrosion-resistant stainless steel races. Use this if you prefer mid-size batch availability and consistent component quality. Limitation: inner diameter of 7mm may not fit all smaller spinner hubs.
NiArt Clear Cap Bearings 24-Pack (Resin Projects)
Designed for resin-casting enthusiasts who want minimal visibility of hardware while keeping performance intact. This kit provides 24 pairs of clear plastic snaps and 24 durable bearings. The snaps pair with resin projects to maintain aesthetics while delivering smooth rotation. Bearings are made from premium metal to ensure longevity and reduced wear. Choose this if you want a clean, almost “invisible” look in your finished spinner. Caution: clear snaps may show slight wear sooner with heavy resin loading.
NiArt 22-Pack Bearing with Caps Set
This option is a compact alternative for projects that require a slightly smaller batch than the 24-pack. It includes 22 MR137 bearings and 22 pairs of caps with the same 13mm outer diameter and 4mm thickness. The bearings are sealed on one side for protection against contaminants and maintained lubrication. Best for limited runs or incremental replacements. Limitation: slightly fewer units than the 24-pack may require more frequent restocking for large crafts groups.
NBEADS 60 Sets Fidget Spinner Bearing Caps
Best for high-volume projects, schools, or long-term use. This bulk kit includes 60 complete sets of caps and compatible bearing cores. Caps are made of sturdy plastic to withstand repetitive spins, with carbon steel alloy bearings for reliable rotation. The cap size is about 12mm in diameter and 11mm in thickness, compatible with most standard hand spinners. Choose this when planning multiple DIY spinner builds or replacements over time. Caution: bulk packaging may require more storage space.
NBEADS 60 Sets Fidget Spinner Bearing (Different Size)
Another bulk offering from NBEADS, featuring 60 sets with larger 15mm caps and 12mm thick variations to fit broader spinner models. Designed for versatility across different designs, this kit supports both beginners and advanced crafters. Best for those who want more size options in a single purchase. Limitation: size variance may require careful matching to existing spinner hardware.
Buying Guide: Key Purchase Considerations
What should you look for when buying fidget spinner bearing caps?
- Size compatibility: Confirm inner diameter (I.D.), outer diameter (O.D.), and thickness to match your spinner hubs. Common MR137 bearings are 7mm I.D. and 13mm O.D.
- Seal type: One-sided seals protect against dust and water, improving longevity but sometimes slightly affect clearance.
- Material quality: Stainless steel or chrome steel bearings with durable plastic caps provide better wear resistance and smoother spins.
- Cap color and style: Caps come in black, clear, or other finishes. Choose based on your aesthetic goals for resin or plain spinners.
- Quantity: Bulk sets save time for multiple projects but require more storage; smaller packs are easier to manage for beginners.
- Intended use: Resin casting, skateboard-style spinners, or education kits may benefit from different cap designs (clear or colored).
- Installation simplicity: Look for sets that include caps sized to fit the corresponding bearings, reducing guesswork during assembly.
How to choose among the top options
- Best for large resin projects: NiArt 24-Pack with transparent caps offers a visually clean result and many components.
- Best for frequent replacements in groups: NiArt 20 Pack provides steady availability with reliable performance.
- Best for bulk purchases: NBEADS 60 Sets is ideal for classrooms and long-term crafting with many caps and bearings.
- Best for aesthetic resin work: NiArt Clear Cap Bearings 24-Pack focuses on clear snaps that blend with epoxy resin projects.
- Best for varied sizes: PH PandaHall 30 Sets offers three sizes to fit multiple spinner designs.
FAQ
- What is MR137? — MR137 refers to a common radial ball bearing size used in many fidget spinners, with typical dimensions around 7mm I.D., 13mm O.D., and 4mm thickness.
- Are these caps universal for all spinners? — Not all caps fit every spinner core; verify the inner diameter and mounting method before upgrading components.
- Should I choose sealed or unsealed bearings? — Sealed bearings resist contaminants and lubrication loss, improving longevity in dusty environments.
- Can I mix caps from different brands? — Mixing is possible if dimensions match, but performance may vary; match caps to bearings for best results.
- Which kit is best for resin crafts? — Kits with clear or transparent caps (like NiArt Clear Cap Bearings) are ideal for aesthetics in resin spinner projects.
- Do these kits include both caps and bearings? — Yes, most listed kits provide pairs of caps with corresponding MR137 bearings, though exact contents vary by kit.