Koyo Accessory Drive Belt System Components

Koyo & Koyorad: Decades of Japanese Engineering Excellence

Few names carry as much weight in automotive thermal management and precision bearing technology as Koyo — a legacy that traces its roots to a small radiator repair shop founded in Nagoya, Japan in 1956. What began as Ejiri Radiator has grown, over the better part of seven decades, into a globally recognized manufacturer trusted by OEM automakers and aftermarket technicians alike. Today, the brand operates under two closely related identities: Koyorad, focused on cooling systems, and Koyo (a brand of JTEKT Corporation), renowned for precision bearings and drivetrain components.

Koyorad: The Cooling Systems Specialists

Koyorad's reputation is built on one foundational promise: every product is engineered to meet or exceed original equipment standards. The company manufactures its products in ISO 9001-certified facilities and subjects each new design to thorough real-world testing before it ever reaches a technician's hands. The result is a lineup of radiators that deliver true plug-and-play fitment — no cutting, no modifications, no guesswork. Whether you're replacing a worn-out unit on a daily driver or upgrading a performance build, Koyorad offers both OE-replacement aluminum-core units and all-aluminum racing radiators capable of handling serious heat loads.

Koyorad's product range extends well beyond radiators. The brand also produces A/C condensers, heater cores, intercoolers, and oil coolers — making it a comprehensive source for virtually any heat-exchange need on the vehicle. Their engineering team continuously works to consolidate SKUs, allowing a single part number to cover multiple model years and applications, which simplifies stocking and reduces lead times for shops and enthusiasts.

Koyo Bearings: Precision Where It Matters Most

The Koyo name in the bearings world carries equal prestige. As part of JTEKT Corporation, Koyo has been supplying OEM and aftermarket customers with precision-engineered bearings since the early 20th century. The bearing division produces an extensive range of products, including wheel bearings in angular contact ball, deep groove ball, tapered roller, needle roller, and spherical roller configurations — giving technicians the right unit for virtually any platform. Koyo also introduced ceramic ball bearings for turbocharger applications back in 1997, a testament to the brand's long history of innovation.

On the drivetrain side, Koyo's clutch release bearings are engineered with a centering mechanism that helps prevent heat buildup and wear caused by sudden high-speed rotation — a critical design detail that extends clutch life under demanding conditions. For those needing broader drivetrain support, the brand's bearings & seals catalog covers oil seals and specialty bearing types for transmissions, differentials, and other rotating assemblies throughout the vehicle.

Why Technicians and Enthusiasts Choose Koyo

• OE Supplier Pedigree: Koyo components are used by major automakers as original equipment, meaning aftermarket parts are built to the same exacting standards.
• ISO 9001-Certified Manufacturing: Rigorous quality controls govern every stage of production, from raw material selection to final inspection.
• Broad Vehicle Coverage: With hundreds of applications spanning Japanese, domestic, and European platforms, Koyo covers a wide cross-section of the car parc.
• Engineering Depth: Dedicated R&D centers and manufacturing facilities around the world allow Koyo to develop application-specific solutions rather than one-size-fits-all substitutes.

Whether you're sourcing a direct-fit radiator, a wheel bearing replacement, or a complete set of bearings & seals for a transmission rebuild, Koyo and Koyorad deliver the kind of quality that keeps vehicles on the road — and on the track — for the long haul.