JIS B Rolling bearings — Balls (Foreign Standard). standard by Japanese Industrial Standard / Japanese Standards Association. Standards and specifications are regulated in accordance with JIS B The nominal manufacturing sizes of steel balls are shown in the. JIS B Rolling bearings — Balls (Foreign Standard). Available for Subscriptions. Content Provider Japanese Industrial Standards [JIS].

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The amount jiss which the mean diameter of ball lot should differ from the nominal b15001 diameter, this amount being one of an established series. The mean diameter of a ball shall be obtained in the form of the arithmetic mean of the largest and smallest actual single diameters, and the ball diameter variation shall be obtained in the form of the difference between the largest and smallest actual single diameters.

Grade A specific combination of dimensional form and surface roughness tolerance Nomintal ball Diameter The diameter value that is used for the purpose of general identification of a ball size. Hardness The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specific indenting shape.

Mean Diameter of a Ball The arithmetical mean of the largest and the smallest single diameter of the ball. This term is applicable to case hardened ball only.

## Precision Hardened Balls – Metric / Inch

This Japanese Industrial Standard specifies requirements for finished steel balls for rolling bearings. Case Depth The distance measured radially from the surface of the ball to the point where the ball hardness becomes Rc The ball diameter variation, sphericity and surface roughness of the steel balls shall comply with Attached Table 2. Surface Roughness Surface roughness consists of all those irregularities such jjis crack,cuts and dent,which surface relief.

The method of evaluating the deviation from spherical form of a steel ball shall be in accordance with JIS B appendix A.

Measured by two parallel plane tangent to the surface of the ball. The various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and repeated around the ball surface.

Waviness components on the surface of a ball are usually measured with a waviness-meter using a filter. The principal terms, quantitative symbols and definitions used in this Standard shall be as follows.

### Precision Hardened Balls – Metric / Inch | MISUMI | MISUMI USA

Diameter Tolerance The maximum b15001 deviation of any ball mean diameter from the nominal ball diameter. Ball grade is indentified by the letter G and a number. Sphericity The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface. The designations which is used for the purpose of general identification of a steel ball by dimension.

Lot is the definite quantity of ball manufactured under uniformed condition. Element, irregularity or group elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture, storage, handling or use of the surface.

The arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot. The difference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gauge.

The hardness of steel balls larger than 3mm shall be measured in accordance with JIS Z The mean diameter of a ball shall be corrected taking into account the elastic approach value due to the measuring force and also, as s rule, the elastic approach value due to the mass of the steel ball.

The radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their centers common to the least squares sphere centre. Lot Mean Diameter The arithmetical mean of the mean diameter of the largest ball and that of the smallest balls in the lot. A definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity.

Our trained engineers also work closely with our customers to develop products most suitable for their applications. Lot Diameter Variation The difference between the mean diameter of the largest ball and that of the smallest ball in the lot.

A specific combination of dimensions, form, surface roughness and sorting tolerances.

The difference between the mean diameters of the largest ball and the smallest ball in a ball lot. And it is conventionally defined within the area where deviation of form are eliminated. The diameter necessary for n1501 the mean diameter of a ball and the ball diameter variation shall be measured with the ball placed between the horizontal plane and the stylus applied vertical to it from different directions.