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Ningbo Zhenhai Jinjinnaichi (NJJ) Bearing Co., Ltd. is a national high-tech enterprise specializing in the production of small-sized thin-wall low-noise deep-groove ball bearings.
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The company insists on relying on technological progress, adopting advanced technology and introducing advanced equipment, and is committed to the development and development of low noise bearings.
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Now has more than 130 automatic production lines, equipped with a full set of advanced bearing testing equipment, has a full set of automatic assembly line, the use of automatic line in one step.
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At present, the company selects the high-quality supplier resources in the industry, supporting the supply of bearing steel, steel ball, cage, dust cover and a series of raw materials
How Were Deep Groove Ball Bearings Invented?
Time:
2026-07-09
Deep groove ball bearings are one of the most widely used rolling bearings in the world, but their “invention” was not a single moment - it was the result of long-term progress in precision machining, materials, and rolling - element technology.
Before deep groove ball bearings existed, engineers relied on plain bearings (sliding bearings). Plain bearings can work, but they often create higher friction, wear, and heat - especially as machine speeds increased during industrialization. The next step was the development of rolling bearings, where motion is carried by rolling elements such as balls or rollers. Compared with sliding, rolling bearings can reduce friction and improve efficiency, making them valuable for early steam - era machines and later industrial equipment.
The deep groove concept was designed to solve a specific performance challenge: how to support radial loads while also handling moderate axial forces. The “deep groove” raceway geometry provides a larger contact angle than bearings that support only radial load. That allows the bearing to maintain stable rotation under combined loading, which is why deep groove ball bearings became so popular for general-purpose applications such as motors, fans, pumps, and household appliances.
Invention and adoption were also driven by manufacturing practicality. A deep groove ball bearing can be produced using established machining and grinding methods: the raceways can be formed with high accuracy, and balls can be made with consistent geometry. As ball materials and heat-treatment processes improved (better steel quality and improved fatigue resistance), the bearing’s service life became more predictable.
Over time, standardization accelerated growth. Once dimensions, tolerances, and load ratings were standardized across industries, buyers could select bearings more easily and manufacturers could scale production. Seals and shields later expanded use cases by improving contamination resistance and reducing maintenance.
Today, deep groove ball bearings are seen as a "simple" product, but their widespread success comes from an engineering balance: good load capability, smooth running, manufacturability, and reliability. This is the reason the deep groove design has remained a core bearing type for nearly every kind of rotating equipment.
If you are considering deep groove ball bearings for a specific product, NJJ BEARING can help evaluate load direction, speed conditions, clearance, and sealing choices to match real operating requirements.
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