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Generally speaking, the rotating ring of the bearing requires an interference fit with either the shaft or housing, and the nonrotating ring demands a slight loose fit with its mating component.

The following tables provide fit recommendations for a variety of operating conditions and load magnitudes. Table I specifies the load classification. Tables II and III specify standard shaft and housing tolerance classifications. Tables IV and V identify the specific fit tolerances for NHBB’s metric series ball and cylindrical roller bearings up to 12” O.D. For help with verifying the correct fit for your application, or to request a complete bearing optimization, please consult NHBB’s Applications Engineering department.

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Thin cross section bearings, such as NHBB’s thin section and torque tube series, are inherently more sensitive to shaft and housing fits than metric ball and roller bearings. In most conditions a line-to-line-to-loose fit is more appropriate for thin cross sections. Heavier cross section bearings require tighter fits than light cross section bearings. In either case, extreme interference fits should only be used in conjunction with larger internal clearance in order to accommodate the subsequent loss of radial play.

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Dimensions are in inches. For metric radial ball and roller bearings of tolerance classes ABEC 1 and RBEC 1.**Values relate to solid steel shafts only. Tighter fits may be needed for hollow or nonferrous shafts.*Select higher classification for greater accuracy (e.g., j5 for j6).

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The most common and often most-identifiable symptom associated with a bad wheel bearing is noise coming from the wheel or tire area of the moving vehicle. You ...

In mathematics, a bearing is defined as an angle measured clockwise from north. Bearings are usually written as a three-figure bearing. For example, the angle ...

For metric radial ball and roller bearings of tolerance classes ABEC 1 and RBEC 1.*Substitute lower classifications where wider tolerances are allowed.Please consult the factory. **Use F7 if temperature differential between inner and outer ring of a large bearing is greater than 10 ˚C.1Values relate to cast iron steel housings. Tighter fits may be needed for nonferrous alloys. 2The outer ring may either be tight or loose in the housing.

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New Hampshire Ball Bearings, Inc. (NHBB) is a leading manufacturer of precision bearings and complex bearing assemblies for the global aerospace, defense, medical, and high technology markets. The company is a subsidiary of MinebeaMitsumi Inc. and an integral part of the global brand, MinebeaMitsumi Aerospace.

Establishing accurate shaft and housing fits is critical to achieving the best possible bearing performance. Fits that are too loose or too tight can create conditions that lead to premature bearing failure. Under certain conditions, overly loose fits can lead to corrosion of the shaft or bore, excessive wear, poor bearing rotation, and excessive vibration and noise. Exceedingly tight fits may cause large mounting and dismounting forces, unwanted preload, overheating, and a reduction in radial play.

The specific recommendations for shaft and housing fits for metric series radial ball and roller bearings are covered under ABMA Standard 7. The standards do not apply to inch series bearings. Consult HiTech’s Applications Engineering department ;for assistance.

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To determine whether a load is either light, normal, or heavy, divide an application’s equivalent radial load (Pr) by the bearing’s dynamic radial load rating (Cr). Compare the results with Table I. See page 44 for a definition and method for calculating equivalent radial load.

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Shaft and housing fits are governed by the assembly’s specific operating requirements and conditions. The various factors to consider include the type and amount of load, operating temperature, running accuracy requirements, material composition and machining tolerances of mating components, and the size and type of bearing specified.