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FAQS

QWhat is MACHINED SURFACE FINISHES FOR SHAFTS AND HOUSINGS?

AThe cup and cone seats should be smooth and within specified tolerances for size, roundness and taper. Ground finish is usually recommended for shafts whenever possible. The recommended finish for ground and turned surfaces is as follows: • Cone seats - ground 63 micro-inches AA (maximum) (1.6 micrometer). • Cone seats - turned 125 micro-inches AA (maximum) (3.2 micrometer). If the bearing seat finishes are rougher than these limits, there is not enough contact area and the fit will loosen easily, especially if the race is pressed on and off several times. The following tables show machined finishes for shafts and housings and the recommended fitting practice for both inch and metric sizes.

QWhat is TTHD tapered rollers?

AThe geometry of the TTHD tapered rollers provides increased capacity over cylindrical thrust and spherical thrust bearings with the same envelope dimensions. The extensions of the raceways and rollers converge at a common point (the apex) on the axis of rotation, resulting in true rolling motion. True rolling motion reduces heat generation and wear on the races and rollers. It also allows higher speeds with minimum roller skewing or skidding. Enhanced features, such as coatings and finishes, also reduce film and skidding damage and handle high shock loads.

QWhat is Deep Groove Ball Bearings?

AOur deep groove ball bearings deliver reliable performance in a wide range of applications and conditions. With super-finished raceways and controlled geometries, our premium design helps ensure consistent quality. Our portfolio includes standard, thin section, narrow, wide and miniature and extra-small deep groove ball bearings that span 3 mm to 400 mm bore sizes. The extended product line includes a complete offering of open, shields, seals and snap ring combinations. Easy Interchange Designed as metric bearings, our deep groove ball bearings follow ISO standards and are dimensionally interchangeable with competitor metric products. Premium Lubricants For reduced torque and a quieter operation, Mobil Polyrex™ EM premium lubricant comes standard on all Timken sealed and shielded deep groove ball bearings. This grease has a temperature range from -29° C to 177° C. Brass Cage Availability Deep groove ball bearings with brass cages (available in select sizes) can deliver extra strength and durability in the most unrelenting conditions: extreme shock loads, high vibrations and high forces due to acceleration. Quiet Running for Electric Motor Quality Deep groove ball bearings are frequently used in electric motor applications to minimize vibration and noise. To meet our long-standing electric motor quality guidelines we designed in: Super finishing on raceways to reduce friction Preferred clearance designation (C3) Premium grease for high performance, low torque and less noise

QWhat is Angular Contact?

AAngular contact ball bearings are designed for combination radial and axial loading. Single-row bearings have high thrust capacity in one direction. Some single-row bearings are specifically designed for duplex mounting in sets for maximum performance. Double-row Conrad bearings can accommodate thrust in both directions. Size Range Single-row: 10 mm – 150 mm (0.3937 in. – 5.9055 in.) bore Double-row: 12 mm – 150 mm (0.4724 in. – 5.9055 in.) bore Design Attributes Specific geometry of angular contact bearing raceways and shoulders creates ball contact angles that support higher axial loads. Expanded options include special lubricants, cage materials, preloads and coatings for additional corrosion resistance. Applications Angular contact ball bearings are engineered for use in high-speed, high precision applications for: Agriculture Chemical General industry Utilities

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