Food processing production lines, pharmaceutical equipment, automatic medical instruments and equipment working in humid or seawater environments are constantly exposed to clean water, detergents, disinfectants and weak acid & alkali media. Ordinary carbon steel bearings tend to rust easily. Rust on raceways accelerates ball abrasion, increases rotational resistance, leads to unsmooth operation and loud noise. Worse still, peeled rust debris may contaminate raw materials and medicines and bring hidden sanitary risks. Conventional bearings with anti-rust coatings suffer from easy peeling of protective layers under repeated washing and high-temperature spraying, so anti-rust performance cannot last long and fail to meet strict hygiene standards of food and medical industries. Many light conveying, stirring and filling machines have compact structures with no extra space for external sealing protection, requiring bearings to possess inherent stable rust and corrosion resistance. Meanwhile, food and medical instruments demand high cleanliness for spare parts. Bearings need to be filled with food-grade lubricant without pollutant release during operation. NMT Stainless Steel Deep Groove Ball Bearings are manufactured from stainless steel, featuring natural rust prevention and weak corrosion resistance. Suitable for working environments with high humidity, water spraying and detergent contact, they are widely used in food, pharmaceutical and light industrial automatic equipment.

With continuous upgrading of specifications in food and biomedicine industries, various cleaned processing equipment and sterile conveying devices impose higher requirements on corrosion resistance and sanitation performance of components. Ordinary bearings develop rust spots after short-term operation. Frequent bearing replacement raises equipment operation cost and interrupts continuous production. Some equipment requires regular high-temperature water washing and acid-base sterilization, while coating anti-rust solutions lack sufficient flushing resistance and fail quickly. Many small automatic filling and stirring machinery own limited internal space with no room for complicated external waterproof structures. Bearings have to resist invasion of water vapor and corrosive media by themselves. In addition, medical testing instruments and laboratory equipment need stable low-noise operation. Vibration and abnormal noise caused by rust will interfere with detection accuracy. Equipment manufacturers are in urgent need of standard bearings combining lightweight design, low noise and long-term rust prevention. Adopting classic deep groove ball structure, NMT Stainless Steel Deep Groove Ball Bearings deliver smooth rolling and can bear radial loads and slight bidirectional axial loads. Stainless steel material fundamentally prevents rust induced by moisture and satisfies demands of long-term stable operation under clean working conditions.

Made of high-quality stainless steel, NMT Stainless Steel Deep Groove Ball Bearings rely on inherent physical and chemical properties of raw materials to resist oxidation and rust in environments with water vapor, clean water, disinfection solvents, weak acid and alkali without surface coating protection. The classic deep groove ball structure enables balls to bear radial loads and minor bidirectional axial loads, adapting to multiple light rotary transmission scenarios. Bearing raceways are processed via precision grinding with excellent surface finish, low rolling resistance and stable low-noise operation. A complete range of specifications covers open type, rubber sealed dust-proof type and metal shield type. Sealed bearings can block water vapor and waste cleaning liquid from penetrating inward to further extend service life. Food-grade grease filling is optional to meet hygiene control standards of food processing and pharmaceutical industries. Standard overall dimensions are fully interchangeable with conventional deep groove ball bearings. No modification on mounting base is needed for equipment renovation. Widely applied in food stirring machinery, baking conveying lines, pharmaceutical filling equipment, automatic medical instruments, small water treatment devices, laboratory testing equipment and seafood processing conveying machinery.

Inner rings, outer rings, steel balls and cages are made of stainless steel. Sampling inspection on composition and hardness is conducted for incoming raw materials to guarantee material stability. Raceways go through fine grinding with strictly controlled dimensional tolerance and surface roughness to reduce rolling friction and restrain temperature rise during operation. Stamped cages are precision processed to avoid ball jamming under high-speed rotation. Water-resistant and detergent-resistant rubber seals are optional for frequent water washing conditions. Rotation flexibility and radial clearance sampling inspection are carried out for all finished products. Units with unsmooth rotation and out-of-tolerance clearance are eliminated to ensure consistent operation performance among batches.

The complete dimensional series adapts to clean and humid working conditions including food machinery, pharmaceutical equipment and laboratory instruments, supplying long-term rust-proof support solutions for light rotary mechanisms under corrosive environments.

Core Product Advantages

All-stainless steel main structure with native rust and corrosion resistance, resisting rust spots in environments with clean water, disinfectants, weak acid and weak alkali;

Classic deep groove ball structure bearing radial loads and bidirectional axial loads, highly universal for numerous light transmission mechanisms;

Precision grinding on raceways delivers smooth rotation, low vibration and quiet operation, suitable for precision medical and testing equipment;

Multiple sealing options prevent invasion of water vapor and cleaning solutions and mitigate damage of corrosive media to rolling components;

Food-grade lubricant filling available with no harmful substance precipitation, complying with clean production requirements of food and pharmaceutical industries;

Standard universal installation dimensions, directly interchangeable with ordinary deep groove ball bearings without base modification during equipment upgrading;

Stable raw material with no coating peeling risk, achieving longer anti-corrosion effect compared with coated anti-rust bearings;

Specifications cover miniature and small standard sizes to meet compact assembly demands of small automatic instruments and light conveying devices.

Typical Application Scenarios

Food stirring, cutting and baking processing machinery; food belt conveyors and roller assembly lines; automatic pharmaceutical filling and capsule processing devices; transmission parts of medical testing instruments and rehabilitation equipment; small laboratory test equipment; light seafood processing and water treatment equipment; automatic conveying modules working in indoor humid environments.

Quality Assurance

NMT Stainless Steel Deep Groove Ball Bearings adopt special stainless steel raw materials. Sampling inspection on chemical composition and hardness is implemented for every batch of incoming materials to prevent unqualified raw materials from production. Inner and outer rings go through stamping, heat treatment and precision grinding. Geometric precision of raceways is strictly controlled. Stainless steel balls are sorted after high-precision grinding with tiny dimensional deviation for uniform load distribution. Deburring is conducted on stamped cages to guarantee unobstructed ball movement. Sealing rubber materials resist hydrolysis and common detergents, avoiding aging and hardening under long-term water washing. Visual inspection is carried out to eliminate workpieces with collision marks and scratches. After assembly, rotary torque of each bearing is tested one by one. Samples are regularly selected for spray corrosion durability tests. Defective products are sorted separately. Every stainless steel bearing is guaranteed to own flexible rotation and stable anti-rust performance, supplying reliable rotary supporting components for automatic equipment operating under clean and humid conditions.

Product Range

Open stainless steel deep groove ball bearings, double-side rubber sealed stainless steel bearings, double-side metal shield stainless steel bearings. Selection based on humidity level, contact with chemical detergents and rotation speed.

Brand Strength

NMT devotes to R&D and manufacturing of corrosion-resistant stainless steel bearings. Targeting special working conditions of frequent water washing and regular sterilization in food and pharmaceutical industries, NMT continuously optimizes material proportion, raceway processing technology and sealing structures. The bearings effectively solve common pain points such as easy rusting and coating peeling leading to material contamination for ordinary bearings. NMT helps food and pharmaceutical equipment manufacturers reduce component replacement frequency and avoid sanitary safety risks during production.