Stainless Steel Half-Hole Thread Ball Bearings — Precision Fit for DIY & Mechanical Applications
When your project demands a fastening point that's both decorative and structurally sound, a standard ball just won't cut it. These stainless steel half-hole thread ball bearings are engineered for makers, hobbyists, and technicians who need a reliable threaded anchor built into a polished round ball — no improvising, no adapters.
Each ball is precision-machined from solid stainless steel with a polished natural finish. The half-hole is pre-tapped to accept M2, M2.5, M3, or M4 threads, with outer diameters ranging from 5 mm (approx. 0.20 in) up to 60 mm (approx. 2.36 in), giving you a wide selection for everything from miniature assemblies to larger decorative hardware.
Common use cases include DIY bead bracelets and jewelry, mechanical linkage points, teaching and lab experiments, decorative hardware accents, and precision instrument accessories — anywhere a threaded ball mount adds both function and a clean aesthetic.
✅ Compatible with standard M2, M2.5, M3, and M4 metric threaded fasteners. Suitable for stainless steel, aluminum, and plastic assemblies requiring a corrosion-resistant ball mount.
Key Features
- 🔩 Pre-tapped half-hole threading — Available in M2, M2.5, M3, and M4 thread diameters for direct bolt-in installation without additional machining.
- 🪙 Solid stainless steel construction — Corrosion-resistant material ensures long service life in both indoor and outdoor environments.
- ✨ Polished natural finish — Smooth, mirror-like surface treatment enhances appearance and reduces friction at contact points.
- 📐 Wide size range — Outer diameters from 5 mm to 60 mm (approx. 0.20 in – 2.36 in) cover a broad spectrum of project requirements.
- 🎨 Versatile application scope — Ideal for DIY jewelry, mechanical accessories, hardware fittings, lab demonstrations, and decorative assemblies.
- 📦 Individually packaged — Each ball is packed in a protective plastic bag or carton box to prevent surface scratching during transit and storage.
Who Is This For
🔧 DIY Makers & Hobbyists
Perfect for bead bracelet crafting, custom jewelry, and decorative hardware projects where a polished threaded ball adds a professional finishing touch.
⚙️ Mechanical & Engineering Technicians
Use as linkage ball joints, pivot anchors, or precision instrument mounts in machinery repair and prototype builds requiring M2–M4 threaded connections.
🎓 Educators & Lab Researchers
Ideal for physics demonstrations, structural models, and teaching experiments where a standardized threaded ball component is needed.
🏠 Home Improvement Enthusiasts
Great for decorative cabinet hardware, furniture accents, and custom fixture assemblies where stainless steel durability and a clean look matter.
Technical Specifications
| Material |
Stainless Steel |
| Surface Treatment |
Polished |
| Color / Finish |
Natural (Silver) |
| Shape |
Round Ball with Half-Hole |
| Thread Diameter Options |
M2 / M2.5 / M3 / M4 |
| Outer Diameter Range |
5 mm – 60 mm (approx. 0.20 in – 2.36 in) |
| Hole Type |
Half-Hole (pre-tapped) |
| Application |
Decorations, DIY jewelry, mechanical accessories, hardware fittings, teaching experiments |
| Packaging |
Plastic bag / Carton box |
| Quantity |
See variant options |
Frequently Asked Questions
What thread sizes are available for the half-hole?
The half-hole is pre-tapped in M2, M2.5, M3, and M4 metric thread sizes. Select your required thread diameter from the variant options before adding to cart.
What outer diameter sizes can I choose from?
Outer diameters range from 5 mm up to 60 mm (approximately 0.20 in to 2.36 in). The full size range is listed in the variant selector — choose the combination of outer diameter and thread size that suits your project.
Is the stainless steel corrosion-resistant for outdoor use?
Yes. Stainless steel provides good corrosion resistance in typical outdoor and humid environments. For highly corrosive or marine environments, additional protective measures are generally recommended.
Can these balls be used for jewelry and bead bracelets?
Absolutely. The polished natural finish and round form make these balls well-suited for DIY bead bracelets, pendants, and decorative jewelry applications. The threaded half-hole allows secure attachment to findings or wire components.
What is the depth of the threaded half-hole?
The hole depth varies by ball size. As a general guide, the threaded depth is typically proportional to the outer diameter. For precise depth requirements, please contact us to confirm before ordering.
How is the product packaged to prevent surface damage?
Each ball is individually packed in a protective plastic bag or carton box to prevent scratching and surface damage during transit and storage, ensuring the polished finish arrives in perfect condition.
Are these suitable for precision mechanical or instrument applications?
Yes. These stainless steel thread ball bearings are commonly used as linkage points, pivot anchors, and instrument mounts in mechanical assemblies. The pre-tapped threading ensures a consistent, reliable connection for M2–M4 fasteners.
Ready to find your perfect size? Select your outer diameter and thread size from the options above and add to cart. Questions? Contact us — we're happy to help you find the right fit for your project.
