A precision parts manufacturer in Sakura City, Chiba Prefecture, has developed a circular rubber packing certified by Guinness World Records as the world’s smallest commercially available rubber part [1].

The achievement represents a significant leap in micro-manufacturing capabilities. By producing components at this scale, the company enables the development of smaller, more precise medical devices that can operate in confined biological environments.

The rubber packing features an inner diameter of 0.05 mm [1]. This extreme precision allows the part to serve as a critical seal or gasket in ultra-small machinery where traditional rubber components would be too bulky.

Because of the specialized manufacturing process required to achieve such dimensions, the parts carry a high premium. Each individual unit is priced at $1,500, which is approximately 240,000 yen [2].

The company is specifically targeting the medical-device sector for these components [2]. The manufacturer said it intends to leverage its precision-manufacturing expertise to supply these parts to firms developing next-generation surgical tools or implantable devices [2].

Located in Chiba Prefecture, the manufacturer focused on the technical challenge of maintaining structural integrity while reducing the size of the rubber packing [1]. The Guinness World Records certification confirms that no other commercially available rubber part currently matches this scale [1].

“The rubber packing features an inner diameter of 0.05 mm.”

The production of a 0.05 mm rubber part signals a shift toward extreme miniaturization in medical technology. As surgical robotics and minimally invasive implants require smaller footprints to reduce patient trauma, the availability of commercial-grade, ultra-small seals allows engineers to design devices that were previously impossible to manufacture.