304 Stainless Steel Drilling Ball Beads — Precision Half-Hole & Through-Hole for DIY, Mechanical & Decorative Use
Finding a ball bead that holds its thread without stripping, rusting, or losing its mirror finish is harder than it sounds — especially when you need it to last through repeated assembly cycles or outdoor exposure. Whether you're building a Buddha bead bracelet, assembling mechanical linkages, or crafting decorative hardware, these 304 stainless steel drilling ball beads deliver the dimensional accuracy and surface quality your project demands.
Each ball is precision-machined from solid 304 stainless steel bar stock, then finished with an original-color glossy polish. Available in outer diameters from 5 mm (0.20 in) to 60 mm (2.36 in) and metric thread sizes M2 through M5 (M2 / M2.5 / M3 / M4 / M5), with a blind-hole (half-hole) or through-hole configuration. Inner hole aperture tolerance is typically ±0.1 mm — please select your variant carefully or contact us for custom sizing.
These 304 stainless steel drilling ball beads are equally at home in DIY Buddha bead bracelets, furniture hardware accents, teaching and lab experiments, precision mechanical accessories, and decorative architectural fittings. Sold in packs of 10 per order.
✅ Compatible with M2, M2.5, M3, M4, and M5 metric thread fasteners. Outer diameters 5–60 mm suit standard hardware, jewelry, and mechanical assembly applications.
Key Features
- 🔩 Metric Thread Range M2–M5 — Female blind-hole threads machined to national standard (GB), covering M2, M2.5, M3, M4, and M5 for broad fastener compatibility.
- 📐 Wide Diameter Selection 5–60 mm — Choose from 26 outer diameter options (5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 12.7 / 14 / 15 / 15.9 / 16 / 17 / 18 / 19 / 20 / 22 / 25 / 28 / 30 / 35 / 40 / 45 / 50 / 60 mm) to match your exact design requirement.
- 🛡️ 304 Stainless Steel Construction — Non-polluting, corrosion-resistant, and rust-free material ensures long service life in humid, outdoor, or chemically exposed environments.
- ✨ Original-Color Glossy Polish — Mirror-smooth surface finish enhances aesthetics for decorative applications and reduces friction in mechanical assemblies.
- 🧲 Non-Magnetic or Weakly Magnetic — 304 grade stainless steel exhibits minimal magnetic response, making these balls suitable for sensitive electronic or scientific environments.
- 🔧 Custom Sizes Available — Can be produced in different diameters, half-hole, through-hole, threaded, or shaped non-standard configurations; contact us with your specifications.
Who Is This For
💼 DIY Crafters & Jewelry Makers
Thread these smooth stainless balls onto cord or wire to create Buddha bead bracelets, necklaces, and decorative accessories that resist tarnish and maintain their shine wash after wash.
🔧 Mechanical & Industrial Assemblers
Use the precision-threaded blind-hole design as pivot points, end caps, or decorative fastener covers in machinery, furniture hardware, and architectural metalwork.
🎓 Educators & Lab Technicians
Ideal for physics demonstrations, molecular model kits, and engineering teaching aids where consistent diameter and low magnetic interference are required.
🎁 Hardware Hobbyists & Makers
Perfect for custom hardware projects, CNC prototypes, and maker builds that demand a polished stainless finish with reliable threaded attachment points.
Technical Specifications
| Material |
304 Stainless Steel |
| Product Standard |
National Standard / GB |
| Surface Treatment |
Original color glossy polish |
| Outer Diameter Range |
5 mm – 60 mm (0.20 in – 2.36 in) |
| Thread Sizes Available |
M2, M2.5, M3, M4, M5 |
| Hole Type |
Half-hole (blind hole) / Through-hole |
| Inner Hole Tolerance |
Typically ±0.1 mm |
| Magnetic Property |
Non-magnetic or weakly magnetic |
| Quantity per Pack |
10 pcs |
| Custom Options |
Different diameters, half-hole, through-hole, threaded, shaped non-standard — contact us to confirm |
Frequently Asked Questions
What is the difference between a half-hole (blind hole) and a through-hole drilling ball?
A half-hole (blind hole) ball has a threaded cavity that does not pass all the way through — the thread is recessed into one side of the ball. A through-hole ball has a channel drilled completely through the center, allowing cord, wire, or a rod to pass through. Select the variant that matches your assembly method.
Are these balls truly non-magnetic?
304 stainless steel is generally considered non-magnetic in its annealed state, but machining and cold-working can induce a slight magnetic response. These balls are described as non-magnetic or weakly magnetic — suitable for most decorative and general mechanical uses, but not recommended for applications requiring strict magnetic shielding.
What is the inner hole aperture tolerance?
The inner hole aperture typically has a tolerance of ±0.1 mm. If your application requires tighter tolerances, please contact us before ordering so we can advise on the best option or arrange a custom run.
Can I order custom sizes or non-standard configurations?
Yes. We can produce perforated balls, half-hole balls, threaded balls, and shaped non-standard balls in sizes outside the listed range. Contact us with your outer diameter, hole type, thread size, and quantity requirements for a custom quote.
How many pieces are included per order?
Each listing is sold in a pack of 10 pieces of the same diameter and thread size. Select your preferred Diameter and Thread combination from the variant options before adding to cart.
Will these balls rust or corrode over time?
304 stainless steel offers strong corrosion resistance in most everyday environments, including humidity and mild chemical exposure. For highly corrosive environments (e.g., saltwater immersion or strong acids), consider 316 stainless steel — contact us if you need an upgraded material grade.
What thread standard do these balls follow?
The threads are machined to Chinese National Standard (GB) metric thread specifications, which are dimensionally equivalent to ISO metric threads. They are compatible with standard M2–M5 metric screws and bolts used globally.
Ready to find your perfect size? Select your Diameter and Thread combination above, add to cart, and get precision-machined 304 stainless steel drilling ball beads delivered to your door. Need a custom size or bulk quantity? Contact us — we're happy to help.
