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When standard carbon steel bearings corrode, seize, or fail prematurely in wet, chemical, or food-adjacent environments, engineers and maintenance professionals need a drop-in alternative that holds up without sacrificing speed or load capacity. These 440 stainless steel angular contact ball bearings are built for exactly those conditions — delivering reliable axial and radial load handling where moisture and corrosion are constant concerns.
Each bearing in this single-row series is manufactured from 440-grade stainless steel for both the inner and outer rings as well as the rolling elements. The series spans nine sizes from S7001AC (12×28×8 mm / 0.47"×1.10"×0.31") through S7009AC (45×75×16 mm / 1.77"×2.95"×0.63"), covering a wide range of shaft diameters. The AC designation indicates a 15° nominal contact angle, optimizing the bearing for combined axial and radial loading at elevated speeds.
Typical applications include high-speed spindles in CNC machining centers, centrifugal pumps handling corrosive fluids, food-processing conveyor shafts requiring washdown resistance, and laboratory or medical equipment where contamination from rust particles is unacceptable. The stainless construction also makes these 440 stainless steel angular contact ball bearings a reliable choice for marine deck hardware and offshore instrumentation.
| Bearing Type | Single-Row Angular Contact Ball Bearing |
|---|---|
| Material | 440 Stainless Steel (rings and balls) |
| Contact Angle | 15° (AC designation) |
| Series | S7001AC – S7009AC |
| Bore Diameter Range | 12 mm – 45 mm (0.47" – 1.77") |
| Outer Diameter Range | 28 mm – 75 mm (1.10" – 2.95") |
| Width Range | 8 mm – 16 mm (0.31" – 0.63") |
| Row Configuration | Single Row |
| Cage Material | See variant options |
| Lubrication | See variant options |
| Sealing / Shielding | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Limiting Speed | See variant options |
| Dimensional Standard | ISO 15:2017 |
Match the bearing bore diameter to your shaft diameter. The S7001AC has a 12 mm bore, and each subsequent model increases in bore size up to 45 mm for the S7009AC. Confirm the outer diameter and width fit your housing before ordering — all dimensions are listed in the variant selector and the specifications table above.
Angular contact ball bearings are designed to carry combined radial and axial (thrust) loads simultaneously. The 15° AC contact angle in this series provides a moderate axial capacity relative to radial load, making them well-suited for spindle, pump, and compressor applications where both load directions are present.
440-grade stainless steel offers significantly better corrosion resistance than standard 52100 carbon bearing steel. It performs reliably in wet environments, during washdown cycles, and in contact with mildly acidic or saline media. For highly aggressive chemical environments (strong acids, chlorinated solutions), consult your application engineer to confirm suitability.
The 440 stainless steel construction resists rust and surface oxidation, making these bearings a practical choice for food-processing conveyor shafts and pharmaceutical machinery where contamination from rust particles must be avoided. Verify that the cage material and lubrication type selected are also compliant with your facility's hygiene standards.
Yes. The S7001AC–S7009AC series follows ISO dimensional standards for the 70xx bearing family, so they are dimensionally interchangeable with other manufacturers' S70xxAC components. Always verify bore, outer diameter, and width against your housing drawing to confirm a proper fit before installation.
Single-row angular contact ball bearings are typically mounted in pairs (face-to-face or back-to-back) and require axial preload to eliminate internal clearance and improve stiffness. The correct preload level depends on your speed, load, and stiffness requirements. Refer to your spindle or equipment manufacturer's specification for the recommended preload class (light, medium, or heavy).
The contact angle suffix indicates the nominal angle between the line of action through the ball contact points and the bearing's radial plane. AC = 15°, C = 15° (some standards), B = 40°. A larger contact angle increases axial load capacity but reduces the limiting speed. The 15° AC angle in this series balances thrust capacity with high-speed performance for spindle and pump use.
