For the mechanics, engineers, and DIY pros out there: this is a Koyo HK2820 drawn cup needle roller bearing. It's a high-quality radial bearing designed for applications where space is tight but you need to handle serious dynamic loads. The specs are: 28mm Inner Diameter (ID), 35mm Outer Diameter (OD), and a width of 20mm. It has a drawn steel outer shell (the 'cup') which makes it thinner and perfect for compact designs, and a steel cage inside that keeps the needle rollers evenly spaced. This setup reduces friction, vibration, and noise, especially at higher speeds—it's rated for up to 12,000 rpm. The rollers themselves are made from tough, through-hardened high-carbon chromium steel for excellent durability and heat resistance. You'll find bearings like this in all sorts of industrial and automotive gear: think transmissions, compressors, agricultural equipment, and more. It meets ANSI/ABMA, DIN, and ISO standards, so you know it's built to last. Make sure these dimensions match what you're replacing. A reliable component for keeping machinery running smoothly.
