In fields pursuing ultimate space efficiency such as industrial robotics, medical equipment, and semiconductor manufacturing, every millimetre of thickness is precious. Conventional standard bearings increase proportionally in width and thickness as bore diameter increases, causing equipment volume to expand continuously. Equal-section thin-section bearings break this rule—regardless of changes in bore diameter, the cross-section dimensions remain constant.

 

NMT Equal-Section Thin-Section Bearings achieve lightweight compact layouts through constant cross-section design, providing ultimate space efficiency for robot joints and precision equipment. All joints from the robot wrist to the base can share the same thin-section structure, making the overall layout compact and efficient. Designers can break free from the惯性思维 of progressively enlarging bearing volumes, transforming bearings from a "necessary evil" that occupies space.

 

Constant cross-section is the most distinctive feature of NMT equal-section thin-section bearings. As bore diameter increases while the cross-section remains unchanged, equipment pursuing larger hollow spaces does not need to pay the additional thickness penalty for bearings. This design approach enables robot wrist, elbow, and shoulder joints to adopt the same bearing series solution uniformly. Overall machine weight and volume are thus further reduced.

 

High rigidity and lightweight are balanced in NMT equal-section thin-section bearings. Thin-section structures are inherently sensitive to deformation, yet NMT endows rings with sufficient rigidity reserves while maintaining slender cross-sections through appropriate material selection and heat treatment processes. Raceway surfaces achieve high hardness while the core maintains impact toughness. When robots perform rapid pick-and-place operations with high-frequency start-stop, bearings maintain stable support rigidity.

 

High rotational accuracy is the fundamental quality of NMT equal-section thin-section bearings. The equal-section structure naturally avoids impact and vibration caused by sudden changes in raceway rigidity. Combined with NMT's strict screening of rolling element dimensional consistency and precise calculation of lubricant quantity, bearings maintain low-noise, low-jitter operation even at high speeds or after prolonged followed by restart. In scenarios requiring continuous high-frequency reciprocating for hours, NMT's fine treatment of rolling contact surfaces keeps starting torque and running torque within a narrow low-amplitude range. NMT has developed a low-particle lubrication for equal-section thin-section bearings, combined with special phosphating treatment processes, enabling bearings to maintain low particle generation rates even during long-term low-speed oscillation.

 

NMT equal-section thin-section bearings are available in deep groove ball, angular contact ball, and four-point contact ball types, with P5, P4, and P2 precision grades available. The thin-section 6700 and 6800 series offer various configurations including dust cover types, flanged types, stainless steel types, and wide types.

 

Core Product Advantages

Constant cross-section design—cross-section dimensions remain unchanged as bore diameter increases, enabling all joints to share the same thin-section structure;

 

Lightweight compact layout, further reducing overall machine weight and volume, unleashing design freedom;

 

Appropriate material selection and heat treatment processes, maintaining sufficient rigidity reserves in thin-section rings, remaining stable under high-frequency start-stop;

 

Raceway surface zone hardening treatment—high surface hardness, impact-resistant core, balancing wear resistance and impact resistance;

 

Strict screening of rolling element dimensional consistency, keeping starting torque and running torque within a narrow low-amplitude range;

 

Equal-section structure avoiding sudden changes in raceway rigidity, low-noise, low-jitter operation;

 

Low-particle lubrication solution with phosphating treatment, maintaining low particle generation rates during long-term low-speed oscillation;

 

Comprehensive variety—6700 and 6800 series with dust cover, flanged, stainless steel, and wide types available.

 

Typical Applications

Industrial robot joints—lightweight compact transmission for wrist, elbow, and shoulder joints; Medical equipment—low-noise precision rotation for surgical robots and CT scanner rotary platforms; Semiconductor equipment—low-particle-generation transmission for long-term low-speed oscillation in clean environments; Aerospace mechanisms—lightweight high-precision rotating components; Optical and inspection instruments—high-accuracy angular positioning and stable tracking; Stepper motors and reduction gears—precision transmission in compact spaces; Rotary encoders—stable support for high-accuracy angular feedback.

 

Quality Assurance

NMT equal-section thin-section bearing quality assurance covers the entire process from raw materials to finished products. High-purity alloy steel undergoes spectral analysis, inclusion rating, and grain size testing upon incoming inspection. Precision forging and carbonitriding heat treatment ensure dimensional stability of thin-section rings. Raceway surfaces undergo zone hardening treatment—raceways achieve high hardness while the core maintains impact toughness.

 

Thin-section rings are extremely sensitive to form errors—the thinner the wall, the more easily deviations in roundness are amplified into  fluctuations in rotational resistance. NMT employs high-precision grinding and superfinishing, strictly controlling ring roundness and wall thickness deviation. Rolling elements undergo multi-stage grinding and precision grading with screening of dimensional consistency. Assembly takes place in clean environments with precise calculation of lubricant quantity. Finished products pass torque, vibration, rotational accuracy, and run-in tests, with complete data archived. Rust-preventive packaging ensures flawless delivery.

 

Product Range

6700 series equal-section thin-section bearings—ultra-thin type for极致 lightweight; 6800 series equal-section thin-section bearings—standard thin-section type with better load capacity; Available in deep groove ball, angular contact ball, and four-point contact ball types; Available in dust cover, flanged, stainless steel, and wide types; P5, P4, and P2 precision grades available; Open and sealed configurations available.

 

Brand Strength

NMT has been dedicated to the research, development, and manufacturing of precision bearings for over a decade. As a lightweight compact category within the NMT product portfolio, equal-section thin-section bearings serve industrial robotics, medical equipment, semiconductor manufacturing, aerospace, and other high-end equipment sectors with constant cross-section, lightweight, and high precision characteristics. The company operates complete precision machining production lines, professional testing laboratories, and an experienced technical team.

 

NMT equal-section thin-section bearings deeply integrate the space efficiency advantages of constant cross-section design with precision manufacturing processes—from dimensional stability control of thin-section rings to zone hardening heat treatment, from low-particle lubrication solutions to management of starting torque—continuously optimising across the three dimensions of lightweight, compactness, and rotational accuracy. Bearings are the core of precision transmission in compact spaces. With professional capability and quality commitment, NMT provides trustworthy equal-section thin-section bearing products for high-end equipment pursuing ultimate space efficiency.