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.8MM-C SI3N4. BALL GRADE 5 (1 PC)

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The .8MM-C SI3N4. BALL GRADE 5 (1 PC) is a precision-engineered ceramic ball made from silicon nitride, known for its exceptional hardness and lightweight properties. With a diameter of 0.8 millimeters, this Grade 5 ball offers superior wear resistance and high-temperature stability, making it ideal for applications requiring minimal friction and extended service life. Perfect for use in high-speed bearings, aerospace components, and advanced machinery, this single piece combines advanced material science with exacting manufacturing standards to ensure consistent performance. Available now for specialized industrial and engineering needs.

Who we are

TrojakBearings.com is proudly operated by Ložiska-Polička.cz, a family-run company established over 30 years ago. From our warehouse located in Borová, Czech Republic, we have been reliably providing bearings, transmission parts, V-belts, oil seals, chains, and related equipment to thousands of satisfied customers worldwide.

We specialize in sourcing bearings of virtually any brand and specification, leveraging our extensive network built over three decades. With a dedicated team of 5 professionals, we ensure expert assistance and rapid dispatch—orders placed before 11:00 AM (UTC, Central European Time) ship the very same day globally.

Around 70% of our customers are businesses (B2B), from small workshops to large industrial firms across Europe, USA, Asia, and beyond. But no order is too small—private customers and hobbyists also regularly rely on us for their specific bearing needs.

At Ložiska-Polička.cz, we live by our motto: "The whole world spins on bearings". Whatever bearing you need, wherever you need it—trust us to deliver.

Why choose us?

🌍 Global Bearing Access

We can source almost any bearing in existence – fast, reliable, and hassle-free.

📆 Trusted Experience Since 1995

We've been in the bearing business non-stop for over 30 years.

🚚 Fast Worldwide Shipping

We ship in-stock products within 24 hours to any location worldwide.

🧠 Expert Technical Support

Need help choosing the right bearing? Our experienced team is here for you.

💬 Multilingual Customer Support

We speak your language – get support in English, Czech, or Slovak.

🛒 No Minimum Order

Whether you need 1 piece or 100, we’ve got you covered.

🔧 Industrial-Grade Quality

We work only with proven manufacturers and distributors – zero counterfeits.

🛡️ Authenticity Guarantee

We guarantee 100% original products from verified sources.

Brands we work with

…and many more industry leaders.
Visit our official store – Ložiska-Polička.cz