Low Noise Deep Groove Ball Bearings 67/68/69 Series & Thin Wall Bearings for Micro Motors & Robots

What Are Low Noise Deep Groove Ball Bearings?

A deep groove ball bearing is the most common type of rolling bearing. Its design  with deep, continuous raceway grooves  allows it to support both radial and moderate axial loads. The geometry also provides low friction and high speed capability.

Low noise refers to bearings that have been manufactured with tighter tolerances, smoother surface finishes, and optimized internal clearances to minimize vibration and acoustic emissions. In applications like micro motors, drones, or robotic joints, noise is not just an annoyance  it can indicate poor quality, lack of precision, or impending failure.

Key features of low noise deep groove ball bearings:

• Optimized raceway geometry  Reduces vibration at the ballraceway contact.

• Highquality steel balls  Roundness and surface finish directly affect noise.

• Precision cages  Evenly spaces balls and reduces metaltometal contact.

• Clean assembly  Even microscopic contaminants can create noise.

• Proper lubrication  The right grease type and quantity dampens sound and reduces wear.

Jinjin Bearing has built its entire production philosophy around these principles, using only the industrys highestquality supplier resources for bearing steel, steel balls, cages, dust covers, and other raw materials.

Overview of Jinjin Bearings Product Range

As a national hightech enterprise, Jinjin Bearing focuses exclusively on smallsized deep groove ball bearings. Their product portfolio is designed to cover the most demanding microbearing applications.

Metric Series Bearings

Jinjin Bearing produces a full range of metric precision deep groove ball bearings, with the most popular series being:

• 67 series  Extra thin section, 7mm outer diameter and up, ideal for extremely compact designs.

• 68 series  Very thin section, slightly larger than 67 series, offering a balance of compactness and load capacity.

• 69 series  Thicker than 68, providing higher load capacity while still saving space.

These three series are the workhorses of miniature bearings, widely used in micro motors, dental handpieces, small fans, and precision instruments.

ThinWall Series Bearings

For applications where every millimeter of radial space matters, Jinjin Bearing offers a dedicated thinwall series. These bearings have extremely small crosssections relative to their bore diameter, allowing engineers to design compact, lightweight assemblies without sacrificing performance.

Flange Series Bearings

Flange bearings (also known as flanged bearings) have an integrated flange on the outer ring. This simplifies mounting, eliminates the need for separate housing shoulders, and provides precise axial positioning. Jinjin Bearings flange series is particularly popular in printers, copiers, and small gearboxes.

Inch Series Bearings

While most of the world uses metric bearings, many legacy machines and certain regional markets still require inchdimension bearings. Jinjin Bearing produces a complete range of inch series deep groove ball bearings to serve these customers, ensuring compatibility with existing equipment.

NonStandard & Custom Bearings

One of Jinjin Bearings greatest strengths is its ability to produce all kinds of nonstandard series bearings. From modified bore diameters to special grease, seals, or materials, the company works closely with customers to develop custom solutions. This flexibility is a key reason why many OEMs choose Jinjin as their longterm bearing partner.

Why 67/68/69 Series Bearings Are Ideal for Micro Motors

Micro motors are found everywhere  from electric toothbrushes and hairdryers to medical pumps and automotive actuators. These motors operate at high speeds, often in confined spaces, and must run quietly for years.

The 67, 68, and 69 series bearings are exceptionally well suited for micro motors for several reasons:

• Compact outer dimensions  They fit into the small bearing seats of micro motor housings.

• Low torque  The deep groove design and precision balls minimize starting and running torque, improving motor efficiency.

• High speed capability  With proper lubrication, these bearings can handle the high RPMs typical of small electric motors.

• Low noise  Jinjins advanced manufacturing processes ensure that bearinggenerated vibration is below perceptible levels.

For example, a 685 bearing (5mm bore  11mm OD  5mm width) is commonly used in the rotor support of small DC motors. A 696 bearing (6mm  15mm  5mm) is often found in electric screwdrivers and mini angle grinders.

Jinjin Bearings automated production lines (over 70 lines) ensure that every 67, 68, and 69 series bearing meets the same high standards, batch after batch.

Thin Wall and Flange Bearings for Robotics and Gimbals

Robotics and gimbals (camera stabilization mounts) place unique demands on bearings:

• Very limited space  Robots and gimbals must be lightweight and compact.

• Smooth motion  Any friction or irregularity causes jitter or poor control.

• High precision  Positioning accuracy depends on bearing runout.

• Durability  Continuous operation in dusty or humid environments.

Thinwall bearings provide the solution. Their small crosssection allows designers to fit bearings into tight joints, wrists, and gimbal axes. Despite their thinness, Jinjins thinwall bearings maintain good load capacity and rigidity.

Flange bearings are particularly useful in gimbal designs. The integrated flange simplifies assembly and ensures perfect axial alignment. For robot arms, flange bearings are often used in the endeffector or wrist rotation axes.

Many of Jinjins customers in the drone and photography industries rely on the 67 and 68 series flange bearings for camera gimbals, where even 0.01mm of play can ruin a shot.

Manufacturing Excellence  Jinjin Bearings Production Capabilities

What sets Jinjin Bearing apart from many competitors is their commitment to advanced manufacturing and quality control.

Over 70 Automatic Production Lines

The company operates more than 70 fully automatic production lines. Automation ensures consistency, reduces human error, and increases output. Each line is dedicated to specific bearing sizes and series, allowing for optimized process parameters.

Full Set of Advanced Testing Equipment

Jinjin Bearing has invested in a complete suite of bearing testing equipment, including:

• Vibration and noise testers  Critical for verifying lownoise performance.

• Radial and axial runout testers  Ensures dimensional accuracy.

• Radial clearance testers  Verifies internal fits.

• Torque testers  Measures starting and running torque.

• Life test machines  Simulates realworld operating conditions.

InLine Assembly and OneStep Automation

The company uses a full set of automatic assembly lines that integrate multiple steps into a single automated process. From component feeding to assembly, grease filling, and sealing, the line operates with minimal manual intervention. This onestep approach reduces contamination risk and ensures every bearing is assembled consistently.

HighQuality Supply Chain

Jinjin Bearing selects only the highestquality suppliers in the bearing industry for raw materials:

• Bearing steel  Premium GCr15 or equivalent.

• Steel balls  High grade (G5G10) for roundness and surface finish.

• Cages  Precision stamped steel or injectionmolded nylon.

• Dust covers  Corrosionresistant and dimensionally accurate.

By controlling the supply chain from the start, Jinjin ensures that every finished bearing meets its lownoise, longlife promise.

Applications Across Industries

Jinjin Bearings lownoise deep groove ball bearings serve a wide range of industries:

The common thread across all these applications is the need for low noise, high precision, and reliability  exactly what Jinjin Bearings products deliver.

Quality Philosophy and Management

Jinjin Bearing operates under a clear management philosophy: Peopleoriented, quality first.

The company employs more than 120 skilled workers and technical staff. Under the leadership of the general manager, continuous training and skill improvement are priorities. The management team has introduced a series of sophisticated supporting equipment to enhance production consistency and product quality.

Regular audits, realtime process monitoring, and statistical quality control (SPC) are used throughout manufacturing. The result is a bearing that not only meets international standards but often exceeds customer expectations.

Jinjins goal is clear: to become a firstclass micro bearing manufacturer both at home and abroad.

Why Choose Jinjin Bearing for Your Low Noise Applications?

If you are an engineer or procurement professional looking for a reliable supplier of lownoise deep groove ball bearings, here is why Jinjin Bearing should be your first choice:

• Specialized focus  Unlike general bearing manufacturers, Jinjin only makes smallsized, lownoise deep groove bearings. This focus translates into deep expertise.

• Large production capacity  With over 70 automatic lines, Jinjin can handle both small customized orders and large volume production.

• Full customization  From bore size to seals, grease, and flanges  Jinjin can deliver bearings tailored to your exact needs.

• Competitive pricing  Efficient automation and a wellmanaged supply chain keep costs reasonable.

• Global shipping  Located in Ningbo, near major ports, the company ships worldwide.

• Responsive service  The team is known for quick replies, technical support, and ontime delivery.

Contact Jinjin Bearing for Your Next Project

Whether you need standard 67/68/69 series bearings, thinwall bearings, flange bearings, inch series, or a completely nonstandard design, Ningbo Zhenhai Jinjinnaichi Bearing Co., Ltd. has the experience and technology to deliver.

Add: No. 9, Fengshuidun Road, Luotuo Street, Zhenhai District, Ningbo City, China
Tel: 0086-574-86583010
Fax: 0086-574-86575268
Mob / WhatsApp: +86 15869336060
Email: njjbearing@gmail.com

Visit our facility or contact us today to discuss your lownoise deep groove ball bearing requirements. Let Jinjin Bearing help you achieve smoother, quieter, and more reliable equipment.