Supplying Precision Bearings for Sapphire Lens Grinding: A BRB60040 Export Case to Korea

A set of BRB60040 crossed roller bearings is now ready for shipment to a precision optical component manufacturer in Korea. The bearings will be installed in a sapphire lens grinding machine, an application where rotational accuracy has a direct effect on finished part quality. At BY Bearings, we work with customers like this one every day, and we are sharing the details of this order to show how a bearing is selected, checked and prepared for export in a demanding optical application.

Customer Background

Our customer is a Korean manufacturer of precision optical components. Sapphire is one of the hardest optical materials in common use, which makes it difficult to grind and polish. Lens grinding machines for sapphire must hold a very stable rotary axis under continuous load, because even a small amount of runout can show up as form error or surface defects on the lens.

The rotary axis of the machine therefore needs a bearing that does three things at once: it must rotate with high accuracy, resist tilting under grinding forces, and fit into a compact structure. These requirements guided the selection of the BRB60040.

Why BRB Series Crossed Roller Bearings Was Selected

For this lens grinding application, the customer chose BRB Series Crossed Roller Bearings, specifically the BRB60040 with a 60 mm bore, 120 mm outside diameter and 40 mm width. Several features of the series fit this machine well.

Integrated load capacity: In a crossed roller design, the rollers sit at alternating angles between the raceways. A single bearing can carry radial load, axial load and tilting moment together, so the machine does not need a complex multi-bearing arrangement. This keeps the rotary axis compact and simpler to assemble.

Suitable ring structure: The BRB series follows the RB design, with a separable outer ring and a solid inner ring. This layout works well when the inner ring rotates and high rotation accuracy is required, as in a grinding axis.

High rigidity and low runout: Precision crossed roller bearings offer a stiff, stable rotation, which helps the grinding axis stay steady under load and supports consistent results from one lens to the next.

Quality Control Before Shipment

Before leaving our factory, every bearing goes through our inspection process under an ISO 9001 quality system. We inspect 100% of products before shipment, and our precision grades are produced with tight runout control. Dimensional and geometric checks are supported by coordinate measuring equipment in our facility.

For optical equipment makers, this consistency matters as much as the specification itself. A bearing that arrives within tolerance and performs the same way across batches makes machine assembly and calibration much more predictable.

Packaging and Delivery to Korea

The BRB60040 set has completed inspection and is prepared for international shipment. Precision bearings can be damaged by moisture and impact during transport, so we use specialized anti-rust inner packaging together with heavy-duty structural outer packaging. This protects the raceways and mounting surfaces until the bearings reach the customer’s assembly line.

Korea is one of the key markets we serve, alongside customers across North America, Europe and other parts of Asia. Each shipment follows the same disciplined process, from order confirmation to final packing.

Related Solutions for Optical and Precision Equipment

Sapphire grinding is just one of many applications for compact, high-accuracy rotary supports. Machine builders working on polishing, inspection or other precision rotary axes often have different requirements for load, rigidity and installation space.

For rotary axes that must carry higher axial loads and tilting moments in a rigid, compact package, our Rotary Table Bearings are a common choice. For larger-diameter or heavier-duty rotating structures, Slewing Bearings may be the better fit. Our engineers can help compare options based on the machine’s dimensions, loads and accuracy targets.

About BY Bearings

BY Bearings, operated by Luoyang Boying Bearing Co., Ltd., is a China-based manufacturer of high-precision bearings with more than 15 years of manufacturing experience. We supply customers in more than 65 countries, including distributors, machine tool builders, rotary table manufacturers, DD motor makers and automation and robotics companies.

Our main products include crossed roller bearings, crossed tapered roller bearings, rotary table bearings, slewing bearings and thin section bearings, along with spherical roller, cylindrical roller and thrust bearings. Our factory is certified to ISO 9001, and our products carry CE and RoHS certification.

Customization is a core part of our service. We support OEM and ODM orders, and our engineers work with customers to confirm design, material and parameters before production begins. Whether you need a standard bearing from stock or a version made to your own drawing, we can help you find a practical solution.

If you are looking for a precision bearing for your own equipment, send us your application details and we will recommend a suitable model. You can get a quote directly from our sales team or talk to our engineers about your project.

Contact BY Bearings to Discuss Your Bearing Requirements →

Website: https://www.bybearings.com/
Email: sales@bybearings.com
WhatsApp / Tel: +86 189 3901 9135